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Join Giga: Pioneering AI Solutions
At Giga, we are at the forefront of the AI revolution, having recently secured a $61 million Series A funding round. Our innovative solutions are already being utilized by major companies like DoorDash, as we strive to redefine customer experience through real-time AI agents capable of understanding emotions and resolving issues instantaneously on a global scale.
This is an exhilarating time for us as we aim to transform into the leading AI platform for enterprise automation, driven by our advanced voice superintelligence. To realize our ambitious vision, we are looking for exceptional engineers to join our team.
Our engineers enjoy autonomy and have a significant impact on the experiences of millions of users daily. With visionary founders, established commercial success, and a clear trajectory towards becoming a generational company, we invite you to be a part of our journey.
Giga is trusted by top B2C companies globally to manage their most complex support and operations workflows across various communication channels. If you are eager to contribute to this transformative work, we encourage you to apply!
Join Giga: Pioneering AI SolutionsAt Giga, we are at the forefront of the AI revolution, having recently secured a $61 million Series A funding round. Our innovative solutions are already being utilized by major companies like DoorDash, as we strive to redefine customer experience through real-time AI agents capable of understanding emotions and resolving is…
Join Our Exciting Journey! As a Frontend Engineer at Loft Orbital, you will engage in various innovative projects, focusing on enhancing the user interface of Cockpit, our state-of-the-art satellite operations software. Your role will empower end-users by providing them with advanced satellite management tools. You will collaborate closely with your fellow Frontend Engineering team members and engage with the broader Software team to drive impactful solutions.
Role overview Axiom Bio is looking for a Platform Engineer to join the team at the San Francisco Global HQ. The focus is on building and supporting scalable platforms that enable bioinformatics research. What you will do Collaborate with colleagues from a range of disciplines to design, implement, and maintain platforms for scientific teams Create systems that streamline research workflows and improve efficiency Support projects aimed at advancing bioinformatics capabilities Location This role is based on site at Axiom Bio's San Francisco Global HQ.
Advancing Self-Improving Artificial IntelligenceAt Letta, we’re on a mission to revolutionize artificial intelligence. Unlike traditional AI systems, which are often rigid, our self-improving agents learn continuously from their experiences to adapt and evolve over time.Founded by the innovators behind MemGPT at UC Berkeley’s Sky Computing Lab, home to the development of Spark and Ray, we are supported by industry leaders like Jeff Dean and Clem Delangue. Our AI agents are already enhancing production systems at companies such as 11x and Bilt Rewards, improving every day.Join our elite team of researchers and engineers as we tackle one of AI’s most significant challenges: creating machines that can reason, remember, and learn like humans do.Please note: this position requires in-person attendance, 5 days a week, at our downtown San Francisco office.At Letta, we’re redefining the developer experience for creating, deploying, and engaging with advanced AI agents. We believe that the full potential of AI can only be achieved if developers have the tools necessary to understand their agents thoroughly. Our approach emphasizes:Transparency: Unlike many closed AI systems, we prioritize clarity, providing developers with insights into how their agents interact with LLMs, including what data is inputted and the reasoning behind it.Control: Developers will enjoy granular control over model backends, memory, and inter-agent communication, all while ensuring simple integration with applications.Experience: Working with LLMs should be an enjoyable journey. We are committed to delivering outstanding products with exceptional design.As a Product Engineer, you will play a critical role in building, designing, and defining the interfaces through which developers will engage with our agent framework across various application surfaces.
Full-time|$142.2K/yr - $204.6K/yr|On-site|San Francisco, California
About This Role Join Databricks as a Software Engineer focused on GenAI inference, where you will play a pivotal role in designing, developing, and enhancing the inference engine that drives our Foundation Model API. Collaborating at the intersection of research and production, you will ensure our large language model (LLM) serving systems are optimized for speed, scalability, and efficiency. Your contributions will span the entire GenAI inference stack, from kernels and runtimes to orchestration and memory management. What You Will Do Participate in the design and implementation of the inference engine, collaborating on a model-serving stack tailored for large-scale LLM inference. Work closely with researchers to integrate new model architectures or features such as sparsity, activation compression, and mixture-of-experts into the engine. Optimize latency, throughput, memory efficiency, and hardware utilization across GPUs and other accelerators. Build and maintain tools for instrumentation, profiling, and tracing to identify bottlenecks and inform optimization efforts. Develop scalable routing, batching, scheduling, memory management, and dynamic loading mechanisms for inference workloads. Ensure reliability, reproducibility, and fault tolerance in inference pipelines, including A/B launches, rollback, and model versioning. Integrate with federated and distributed inference infrastructure, orchestrating across nodes, balancing load, and managing communication overhead. Engage in cross-functional collaboration with platform engineers, cloud infrastructure, and security/compliance teams. Document and share insights, contributing to internal best practices and open-source initiatives as appropriate.
Join Pylon Labs: Pioneering B2B Post-Sales SolutionsAt Pylon, we are at the forefront of innovation, creating a comprehensive B2B post-sales support platform that harnesses conversational data and advanced intelligence. Our mission is to empower our clients to manage their operations seamlessly in real-time.With backing from renowned investors such as a16z, BCV, General Catalyst, and Y Combinator, we are proud to support over 1,000 companies, including Linear, Cognition (creators of Devin), Modal Labs, and Incident.io, in streamlining their customer success workflows with our platform. We are also honored to be featured on the Enterprise Tech 30 List.Your Role and ResponsibilitiesDevelop and integrate security features within the product such as audit logging, RBAC, SCIM, SAML, and more.Oversee security review processes, including SOC 2, ISO 27001, HIPAA compliance, and bug bounty programs.Act as the security expert in pre- and post-sales discussions.Facilitate rapid development while ensuring robust security measures are upheld.Lead projects from customer requests through design to deployment.Who You AreYou have experience in building or shipping security features.You have contributed to security and compliance initiatives in a startup or dynamic environment.You are adept at engaging with customers and clarifying technical decisions.You excel when given autonomy, taking ownership of projects, and managing your own tasks.You are located in San Francisco or are open to relocating, enjoy in-person collaboration, and are committed to fostering a positive workplace culture.You are proficient in technologies such as React, Golang, GraphQL, and AWS.You will be joining a skilled technical team of senior engineers from prestigious companies like Samsara, Affinity, and Airbnb.Perks of Working with Us Comprehensive medical, dental, and vision coverage for employees 401(k) retirement savings plan Commuter benefits Generous parental leave 14 company holidays plus unlimited PTO Annual team offsite
About CollateCollate is a cutting-edge AI-driven document generation platform specifically designed for the life sciences sector. Our mission is to streamline documentation processes through automation, enabling our clients to accelerate the delivery of life-saving innovations to patients significantly faster. As a comprehensive solution, Collate supports every phase of drug, diagnostic, and medical device development, from initial concept to market launch.Founded by CEO Surbhi Sarna, a former General Partner at Y Combinator, Collate benefits from her extensive experience, including the founding of nVision Medical which pioneered a novel ovarian cancer detection method that was later acquired by Boston Scientific. Our CTO Nate Smith, previously a Visiting Partner at Y Combinator, is also the founder of Lever. Our talented team of AI researchers, engineers, and designers hail from prestigious companies such as Google, Nvidia, Meta, Netflix, Amazon, AirBnB, Hippocratic AI, and Grail, with 40% of our members being former startup founders.As a compact yet highly skilled team, we have secured over $30 million in seed funding from premier investors including Redpoint, First Round Capital, Conviction, and Y Combinator, as well as leaders in the healthcare and AI sectors. This represents a unique opportunity to join a pioneering company with the potential for transformative impact, led by experienced founders equipped with the resources necessary for large-scale execution.About the RoleWe are seeking a Full-Stack Software Engineer (Backend-Leaning) to architect and develop the systems and user-focused features that drive Collate's success. Your primary responsibilities will revolve around backend challenges—such as APIs, services, and infrastructure—while also engaging in the delivery of complete end-to-end features.This role offers a chance to help shape our technical framework, work closely with design and product teams, and influence the user experience of Collate from the very beginning.Modern Tech StackCollate employs a modern technology stack to ensure a highly reliable and available platform. We utilize Go for scalable backend services, TypeScript and React for frontend development, and Python for AI and ML services. Our infrastructure leverages AWS with Kubernetes for orchestration and Terraform alongside Argo CD for configuration management. Key systems in our architecture include S3, PostgreSQL, Kafka, OpenSearch, LLMs, and various AI models.
Full-time|$170K/yr - $220K/yr|On-site|San Francisco
About Abby CareAt Abby Care, we are committed to revolutionizing family caregiving. With over 50 million Americans serving as unpaid family caregivers, our mission is to empower these individuals by providing them with the training and employment necessary to receive compensation for their invaluable support.Our innovative, tech-driven family care platform is designed to streamline care delivery, enhance health outcomes, and ensure an exceptional experience for families nationwide. We are rapidly expanding and are in search of passionate individuals to join our team. Collaborating with leading insurance providers, healthcare organizations, and community groups, we are backed by prominent venture capitalists dedicated to our mission.Join a talented team comprised of professionals from top companies such as Uber, Scale AI, DoorDash, Dropbox, and Meta, and help us shape the future of family caregiving.
Full-time|$130.6K/yr - $235K/yr|On-site|San Francisco, CA; Seattle, WA; Sunnyvale, CA; New York, NY
Join DoorDash, a leader in the on-demand delivery industry, as we harness the power of data to drive transformative business and product decisions. Our Core Data Platform team is at the forefront of building an operationally efficient analytical data stack that supports our rapid growth.About Our TeamAt DoorDash, we pride ourselves on being a data-centric organization. The Core Data Platform team is responsible for developing the infrastructure that enables us to leverage timely and accurate data for critical insights. We design and operate scalable compute and ingestion frameworks powered by cutting-edge technologies like Spark, Flink, Kafka, Airflow, and innovative lakehouse solutions.About the RoleThis role offers a unique opportunity to contribute to a high-impact team that shapes the future of data at DoorDash. As a Software Engineer, you'll help design and implement frameworks that facilitate data mobility, ingestion, and governance. You'll also play a vital role in setting and maintaining data quality and compliance standards, ensuring that our analytics remain trustworthy and effective. If you're passionate about building systems that drive real-time insights and personalization, we want to hear from you!Your Excitement for This OpportunityLead the vision and strategy for developing scalable frameworks to meet the demands of our growing business.Enhance our analytical platform to handle increasing data volumes and diverse use cases.Utilize your expertise in building and operating high-scale systems with a focus on reliability, scalability, and cost efficiency.Collaborate with stakeholders to create innovative solutions on top of our platform.Contribute to a positive and inclusive work culture, mentoring and uplifting your peers.Your QualificationsB.S., M.S., or PhD in Computer Science or a related field.2+ years of experience at the I4 level, or 5+ years at the I5 level in software engineering.Proven experience in big data technologies (streaming, batch processing, data lakes, OLAP) and promoting real-time data insights.
Join the Innovative Team at Nooks.ai:Nooks is revolutionizing the sales landscape with our cutting-edge AI Sales Assistant Platform (ASAP). By automating repetitive tasks, we empower sales representatives to focus on building relationships and closing deals, leading to increased sales pipelines. Our platform has enabled countless sales professionals to meet their targets, saving our clients hundreds of thousands of hours and generating substantial revenue. We take pride in being the preferred choice for sales teams at industry leaders like Hubspot, Rippling, and Toast, among many others.With over $70M raised from prestigious VCs such as Kleiner Perkins, we are on an impressive growth trajectory, having quadrupled our Annual Recurring Revenue (ARR) in the last two years and aiming for another tripling this year.Discover more about us at Nooks.ai.About the Position:We are seeking a talented Software Engineer to enhance our Core Dialer team. Your mission will be to elevate the user experience of our dialer functionalities—including dialing, task management, configuration settings, connected views, smart lists, and browser extensions—ensuring our sales tools are fast and reliable.Your Responsibilities:Develop and maintain essential dialer features that sales representatives use daily.Collaborate with design and product teams to implement user experience enhancements with meticulous attention to detail.Optimize backend APIs and frontend performance to minimize latency and streamline complex processes.Work cross-functionally with Integrations and Voice Infrastructure teams to ensure seamless operations.Take ownership of enhancing the dialer experience systems.Gain valuable experience with distributed systems and integrations.We Are Looking For Candidates Who Have:3 to 5 years of engineering experience, preferably in SaaS applications.Proficiency in modern frontend technologies (React) and backend development (Node/TypeScript, REST APIs).A solid understanding of data modeling and caching solutions (Postgres, Redis).A passion for working closely with users and rapidly iterating on features.At Nooks, we offer competitive compensation packages that include base salary, equity, and comprehensive benefits. Join us in shaping the future of sales technology!
About UsAt Heidi, we believe healthcare deserves a more harmonious approach—one that ensures care is both ongoing and profoundly human. Our mission is to create an AI Care Partner that collaborates seamlessly with clinicians to achieve this goal.Our diverse team consists of doctors, engineers, designers, researchers, and creatives dedicated to developing tools that allow clinicians to concentrate on their primary focus: their patients.In just a year and a half, Heidi has successfully reclaimed over 18 million hours for healthcare professionals, facilitating 73 million patient visits across 116 countries. Currently, more than two million patient visits weekly are powered by Heidi globally.With nearly $100 million in funding, we are expanding our reach across the US, UK, Canada, and Europe, partnering with esteemed health systems such as the NHS, Beth Israel Lahey Health, and Monash Health.
About Retell AIAt Retell AI, we are pioneering the future of call centers through innovative voice AI technology. Our cutting-edge solutions are transforming how companies engage with customers.In just 18 months since our inception, we've empowered thousands of businesses with our AI voice agents that efficiently manage sales, support, and logistics calls, significantly reducing the need for large teams of human agents. Supported by industry-leading investors including Y Combinator and Alt Capital, we've grown our annual recurring revenue from $5M to an impressive $36M while expanding our team from 5 to 20 talented individuals since 2025.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform where entire contact centers are driven by AI. Unlike basic automation requiring constant human oversight, we’re engineering intelligent AI “workers” capable of serving as frontline agents, quality assurance analysts, and managerial roles, all while optimizing customer interactions continuously.We are rapidly expanding and seeking driven builders who thrive on solving complex technical challenges, act decisively, and wish to make a tangible impact in one of the fastest-growing voice AI startups.Join us in shaping the future!Recognized as a top 50 AI application in the a16z list: https://tinyurl.com/5853dt2xRanked #4 in Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025Featured among the top startups on: https://leanaileaderboard.com/
Join our dynamic team at Sonsoft Inc. as a J2EE Developer, where you will leverage your expertise in Core Java, Spring Boot, and MAVEN to build robust applications. You will be a crucial part of our development team, contributing to the design and implementation of innovative software solutions that meet client needs.
Full-time|$227.2K/yr - $417K/yr|Hybrid|San Francisco, CA; Los Angeles, CA; New York, NY (Hybrid); USA - Remote
About the Role:Join our dynamic ML Infrastructure team as a Software Engineer, where you'll collaborate intimately with the Machine Learning and Product teams to construct top-tier machine learning inference platforms. These cutting-edge platforms drive vital services such as personalized recommendations, search functionalities, and content comprehension at Tubi.Your primary focus will be on the development and maintenance of low-latency ML model serving systems that cater to Deep Learning, LLM, and Search models. This will include the creation of self-service infrastructure and critical components such as the inference engine, feature store, vector store, and experimentation engine.In this role, you'll enhance our service deployment and operational processes, with opportunities to contribute to open-source projects. Enjoy architectural freedom to explore innovative frameworks, spearhead significant cross-functional projects, and elevate the capabilities of our ML and Product teams.We are currently hiring for two positions:Staff Software EngineerPrincipal Software EngineerAdditional Details: As a Principal Engineer, you will serve as a technical leader and visionary, guiding the advancement of our machine learning platform. You'll address complex technical challenges, shape architectural decisions, and mentor senior engineers, fostering a culture of excellence and continuous improvement. Your contributions will impact millions of users.
Full-time|$216.2K/yr - $270.3K/yr|On-site|San Francisco, CA
Scale GP is at the forefront of enterprise Generative AI, offering cutting-edge APIs and infrastructure for knowledge retrieval, inference, evaluation, and intelligent automation. We empower critical workflows for leading enterprises, transforming intricate data and models into dependable, production-ready AI systems. Join our newly formed Agentic Data Products team, dedicated to creating the next generation of agent-powered tools that seamlessly integrate AI into real operational workflows. Our mission is to enable enterprises to unravel their data layers and deploy intelligent systems capable of reasoning, acting, and delivering measurable outcomes. This is a pioneering build team, and we are seeking a highly skilled, product-focused Senior Engineer who thrives in dynamic environments, acts swiftly, and relishes the challenge of constructing new systems from the ground up in collaboration with customers and cross-functional teams. You will partner closely with product managers, forward-deployed engineers, data scientists, and applied AI specialists to transform real-world challenges into scalable, production-ready solutions. If you have a passion for rapid delivery, accountability for outcomes, and enjoy working across the entire stack—from sleek front-end applications to robust distributed backends and LLM integrations—this role is perfect for you.
About the Role OpenAI is looking for a Software Engineer specializing in Kernel Performance and AI Tooling to join the team in San Francisco. This role centers on improving software systems for maximum efficiency and building advanced tools that support AI development. What You Will Do Optimize kernel-level performance across OpenAI's software stack. Design and implement tools that accelerate AI research and deployment. Work closely with engineers to identify bottlenecks and deliver practical solutions. Contribute to technical discussions and share knowledge with teammates. Team and Collaboration Work alongside engineers who are committed to advancing AI technology. Collaboration and innovation are central to the team’s approach.
Our mission: to eliminate every barrier to mental health.At Spring Health, we are dedicated to transforming mental healthcare by dismantling every obstacle that hinders individuals from receiving the support they require, precisely when they need it. Our clinically validated technology, Precision Mental Healthcare, empowers us to deliver tailored care—be it therapy, coaching, medication, or more—customized to the unique needs of each individual.We are proud to collaborate with over 450 organizations, ranging from innovative startups to Fortune 500 giants, as a premier provider of mental health services, impacting the lives of 10 million individuals. Our esteemed clients include renowned brands such as Microsoft, Target, and Delta Airlines, who trust us to provide exceptional outcomes for their workforce worldwide. Through our groundbreaking platform, we have achieved a net positive ROI for employers, and we are the sole entity in our field to receive external validation for delivering genuine cost savings to our clients.With significant investments from leading firms like Generation Investment, Kinnevik, Tiger Global, Northzone, RRE Ventures, and more, we have recently completed a Series E funding round, elevating our valuation to $3.3 billion. We are just beginning our journey—join us as we strive to make mental healthcare accessible to everyone, everywhere.In this pivotal role, you will report to the Associate Director of Data Science - Orchestration and spearhead backend systems that facilitate member-provider matching and precision care routing. As a key member of the Orchestration Group, you will play an essential role in translating machine learning and business logic into scalable, reliable production services that enhance member experience, utilization, and margin performance.This is a hybrid position based in San Francisco, with a requirement to be on-site 2–3 days per week at our 2 Embarcadero Center location. Candidates must reside in the San Francisco metro area or be willing to relocate independently within 90 days of their start date. Occasional travel for team gatherings will be necessary.
Full-time|$162.8K/yr - $203.5K/yr|On-site|San Francisco, CA
At Lyft, we are driven by our mission to connect and serve our communities. We strive to foster a workplace where every team member feels valued and has the opportunity to excel. With over half a billion rides and counting, Lyft is tackling complex challenges on a grand scale, utilizing cutting-edge AI and Machine Learning technologies to enhance customer experiences. The Artificial Intelligence, Machine Learning, and Operations Research Platforms team (AIMLOR) is on the lookout for a Senior Machine Learning Engineer who will play a pivotal role in constructing AI Platform components that empower essential AI applications across Lyft. Mastery in Generative AI and platform development is crucial for this position. You will contribute to our platform that facilitates real-time, online, and offline AI and ML model execution, development, and iteration. Collaborating with a team of talented Machine Learning and Software Engineers, you will work on intricate problems and define solutions that make a direct impact on our systems throughout the organization. If you are enthusiastic about building an AI Platform at scale with applications spanning every aspect of our company, we want to hear from you. If you are a creative thinker with a strong background in AI and machine learning systems and are passionate about leveraging data to solve business challenges in a dynamic, innovative, and collaborative environment, we invite you to apply.
About UsOur mission is to revolutionize language learning.Learning a new language can transform lives by providing access to diverse cultures, career opportunities, and communities. With two billion people globally striving to learn languages, the most effective method—one-on-one tutoring—remains difficult to access at scale and has not evolved significantly over the years. Speak is developing an AI-powered, human-like tutor that fits in your pocket, offering a conversation-first approach that allows learners to practice speaking, receive immediate feedback, and progress through thoughtfully designed lessons. This results in a comprehensive journey from novice to confident speaker across multiple languages.Since our launch in South Korea in 2019, Speak has emerged as the leading language learning app, now available to learners in various markets and over 15 languages. As one of the foremost AI companies globally, we have secured over $150 million in venture capital from notable investors such as OpenAI, Accel, Founders Fund, and Khosla Ventures, with a diverse team spread across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.About This RoleWe are seeking a Senior Backend Engineer, with full-stack capabilities, to help create innovative AI-driven product experiences. The ideal candidate should have experience collaborating closely with product, design, and machine learning teams, alongside a proven track record in developing polished consumer applications. This role is pivotal in shaping our latest products focused on programmatic, conversational language learning and will significantly impact the future direction of our company.Your ResponsibilitiesCrafting innovative AI-driven product experiences and user interfaces for the web.Full-stack engineering with a primary focus on designing scalable backend systems.Troubleshooting complex streaming challenges.Taking ownership of the complete development cycle of features from ideation to production.Writing code efficiently, shipping frequently, and making a substantial impact on our business by facilitating the scaling of our content.Your Profile5+ years of industry experience as a Backend Engineer, ideally within a fast-paced startup environment.Bonus: Experience on an app that has reached over 1 million users.Exceptional problem-solving and communication skills, along with the ability to work effectively in a collaborative environment.
Full-time|Remote|San Francisco, CA or Remote (USA)
About FieldguideAt Fieldguide, we are transforming the landscape of global commerce by revolutionizing the approaches to cybersecurity, privacy, and financial audits. Our innovative software solutions empower professionals to establish trust within businesses, enhancing their efficiency and delivering superior results.As a remote-first company based in San Francisco, CA, we are supported by prestigious investors such as Bessemer Venture Partners, 8VC, Y Combinator, and Floodgate. We pride ourselves on cultivating a diverse workforce and are committed to fostering an inclusive, humble, and high-performing company culture.About the RoleWe are seeking to onboard Software Engineers at various levels to contribute to our expanding team. Depending on your background and aspirations, you could work as a mid-level engineer, assume leadership responsibilities, or influence the technical direction across teams and systems. The specific level will be assessed during the interview process based on your experience and capabilities.This position offers a unique opportunity to make a significant impact in a company that has achieved product-market fit and is poised for substantial growth, challenging outdated audit and accounting tools that have long been overlooked.Your ResponsibilitiesCraft, develop, and implement high-quality features that create value for customers and drive business success.Work collaboratively with product and design teams to transform complex challenges into user-centered solutions.Maintain a balance between rapid iteration and sustainable system health.Continuously enhance our technology stack, developer workflows, and reliability standards.Foster a nurturing, growth-focused engineering culture based on trust, continuous learning, and excellence.
Join Giga: Pioneering AI SolutionsAt Giga, we are at the forefront of the AI revolution, having recently secured a $61 million Series A funding round. Our innovative solutions are already being utilized by major companies like DoorDash, as we strive to redefine customer experience through real-time AI agents capable of understanding emotions and resolving is…
Join Our Exciting Journey! As a Frontend Engineer at Loft Orbital, you will engage in various innovative projects, focusing on enhancing the user interface of Cockpit, our state-of-the-art satellite operations software. Your role will empower end-users by providing them with advanced satellite management tools. You will collaborate closely with your fellow Frontend Engineering team members and engage with the broader Software team to drive impactful solutions.
Role overview Axiom Bio is looking for a Platform Engineer to join the team at the San Francisco Global HQ. The focus is on building and supporting scalable platforms that enable bioinformatics research. What you will do Collaborate with colleagues from a range of disciplines to design, implement, and maintain platforms for scientific teams Create systems that streamline research workflows and improve efficiency Support projects aimed at advancing bioinformatics capabilities Location This role is based on site at Axiom Bio's San Francisco Global HQ.
Advancing Self-Improving Artificial IntelligenceAt Letta, we’re on a mission to revolutionize artificial intelligence. Unlike traditional AI systems, which are often rigid, our self-improving agents learn continuously from their experiences to adapt and evolve over time.Founded by the innovators behind MemGPT at UC Berkeley’s Sky Computing Lab, home to the development of Spark and Ray, we are supported by industry leaders like Jeff Dean and Clem Delangue. Our AI agents are already enhancing production systems at companies such as 11x and Bilt Rewards, improving every day.Join our elite team of researchers and engineers as we tackle one of AI’s most significant challenges: creating machines that can reason, remember, and learn like humans do.Please note: this position requires in-person attendance, 5 days a week, at our downtown San Francisco office.At Letta, we’re redefining the developer experience for creating, deploying, and engaging with advanced AI agents. We believe that the full potential of AI can only be achieved if developers have the tools necessary to understand their agents thoroughly. Our approach emphasizes:Transparency: Unlike many closed AI systems, we prioritize clarity, providing developers with insights into how their agents interact with LLMs, including what data is inputted and the reasoning behind it.Control: Developers will enjoy granular control over model backends, memory, and inter-agent communication, all while ensuring simple integration with applications.Experience: Working with LLMs should be an enjoyable journey. We are committed to delivering outstanding products with exceptional design.As a Product Engineer, you will play a critical role in building, designing, and defining the interfaces through which developers will engage with our agent framework across various application surfaces.
Full-time|$142.2K/yr - $204.6K/yr|On-site|San Francisco, California
About This Role Join Databricks as a Software Engineer focused on GenAI inference, where you will play a pivotal role in designing, developing, and enhancing the inference engine that drives our Foundation Model API. Collaborating at the intersection of research and production, you will ensure our large language model (LLM) serving systems are optimized for speed, scalability, and efficiency. Your contributions will span the entire GenAI inference stack, from kernels and runtimes to orchestration and memory management. What You Will Do Participate in the design and implementation of the inference engine, collaborating on a model-serving stack tailored for large-scale LLM inference. Work closely with researchers to integrate new model architectures or features such as sparsity, activation compression, and mixture-of-experts into the engine. Optimize latency, throughput, memory efficiency, and hardware utilization across GPUs and other accelerators. Build and maintain tools for instrumentation, profiling, and tracing to identify bottlenecks and inform optimization efforts. Develop scalable routing, batching, scheduling, memory management, and dynamic loading mechanisms for inference workloads. Ensure reliability, reproducibility, and fault tolerance in inference pipelines, including A/B launches, rollback, and model versioning. Integrate with federated and distributed inference infrastructure, orchestrating across nodes, balancing load, and managing communication overhead. Engage in cross-functional collaboration with platform engineers, cloud infrastructure, and security/compliance teams. Document and share insights, contributing to internal best practices and open-source initiatives as appropriate.
Join Pylon Labs: Pioneering B2B Post-Sales SolutionsAt Pylon, we are at the forefront of innovation, creating a comprehensive B2B post-sales support platform that harnesses conversational data and advanced intelligence. Our mission is to empower our clients to manage their operations seamlessly in real-time.With backing from renowned investors such as a16z, BCV, General Catalyst, and Y Combinator, we are proud to support over 1,000 companies, including Linear, Cognition (creators of Devin), Modal Labs, and Incident.io, in streamlining their customer success workflows with our platform. We are also honored to be featured on the Enterprise Tech 30 List.Your Role and ResponsibilitiesDevelop and integrate security features within the product such as audit logging, RBAC, SCIM, SAML, and more.Oversee security review processes, including SOC 2, ISO 27001, HIPAA compliance, and bug bounty programs.Act as the security expert in pre- and post-sales discussions.Facilitate rapid development while ensuring robust security measures are upheld.Lead projects from customer requests through design to deployment.Who You AreYou have experience in building or shipping security features.You have contributed to security and compliance initiatives in a startup or dynamic environment.You are adept at engaging with customers and clarifying technical decisions.You excel when given autonomy, taking ownership of projects, and managing your own tasks.You are located in San Francisco or are open to relocating, enjoy in-person collaboration, and are committed to fostering a positive workplace culture.You are proficient in technologies such as React, Golang, GraphQL, and AWS.You will be joining a skilled technical team of senior engineers from prestigious companies like Samsara, Affinity, and Airbnb.Perks of Working with Us Comprehensive medical, dental, and vision coverage for employees 401(k) retirement savings plan Commuter benefits Generous parental leave 14 company holidays plus unlimited PTO Annual team offsite
About CollateCollate is a cutting-edge AI-driven document generation platform specifically designed for the life sciences sector. Our mission is to streamline documentation processes through automation, enabling our clients to accelerate the delivery of life-saving innovations to patients significantly faster. As a comprehensive solution, Collate supports every phase of drug, diagnostic, and medical device development, from initial concept to market launch.Founded by CEO Surbhi Sarna, a former General Partner at Y Combinator, Collate benefits from her extensive experience, including the founding of nVision Medical which pioneered a novel ovarian cancer detection method that was later acquired by Boston Scientific. Our CTO Nate Smith, previously a Visiting Partner at Y Combinator, is also the founder of Lever. Our talented team of AI researchers, engineers, and designers hail from prestigious companies such as Google, Nvidia, Meta, Netflix, Amazon, AirBnB, Hippocratic AI, and Grail, with 40% of our members being former startup founders.As a compact yet highly skilled team, we have secured over $30 million in seed funding from premier investors including Redpoint, First Round Capital, Conviction, and Y Combinator, as well as leaders in the healthcare and AI sectors. This represents a unique opportunity to join a pioneering company with the potential for transformative impact, led by experienced founders equipped with the resources necessary for large-scale execution.About the RoleWe are seeking a Full-Stack Software Engineer (Backend-Leaning) to architect and develop the systems and user-focused features that drive Collate's success. Your primary responsibilities will revolve around backend challenges—such as APIs, services, and infrastructure—while also engaging in the delivery of complete end-to-end features.This role offers a chance to help shape our technical framework, work closely with design and product teams, and influence the user experience of Collate from the very beginning.Modern Tech StackCollate employs a modern technology stack to ensure a highly reliable and available platform. We utilize Go for scalable backend services, TypeScript and React for frontend development, and Python for AI and ML services. Our infrastructure leverages AWS with Kubernetes for orchestration and Terraform alongside Argo CD for configuration management. Key systems in our architecture include S3, PostgreSQL, Kafka, OpenSearch, LLMs, and various AI models.
Full-time|$170K/yr - $220K/yr|On-site|San Francisco
About Abby CareAt Abby Care, we are committed to revolutionizing family caregiving. With over 50 million Americans serving as unpaid family caregivers, our mission is to empower these individuals by providing them with the training and employment necessary to receive compensation for their invaluable support.Our innovative, tech-driven family care platform is designed to streamline care delivery, enhance health outcomes, and ensure an exceptional experience for families nationwide. We are rapidly expanding and are in search of passionate individuals to join our team. Collaborating with leading insurance providers, healthcare organizations, and community groups, we are backed by prominent venture capitalists dedicated to our mission.Join a talented team comprised of professionals from top companies such as Uber, Scale AI, DoorDash, Dropbox, and Meta, and help us shape the future of family caregiving.
Full-time|$130.6K/yr - $235K/yr|On-site|San Francisco, CA; Seattle, WA; Sunnyvale, CA; New York, NY
Join DoorDash, a leader in the on-demand delivery industry, as we harness the power of data to drive transformative business and product decisions. Our Core Data Platform team is at the forefront of building an operationally efficient analytical data stack that supports our rapid growth.About Our TeamAt DoorDash, we pride ourselves on being a data-centric organization. The Core Data Platform team is responsible for developing the infrastructure that enables us to leverage timely and accurate data for critical insights. We design and operate scalable compute and ingestion frameworks powered by cutting-edge technologies like Spark, Flink, Kafka, Airflow, and innovative lakehouse solutions.About the RoleThis role offers a unique opportunity to contribute to a high-impact team that shapes the future of data at DoorDash. As a Software Engineer, you'll help design and implement frameworks that facilitate data mobility, ingestion, and governance. You'll also play a vital role in setting and maintaining data quality and compliance standards, ensuring that our analytics remain trustworthy and effective. If you're passionate about building systems that drive real-time insights and personalization, we want to hear from you!Your Excitement for This OpportunityLead the vision and strategy for developing scalable frameworks to meet the demands of our growing business.Enhance our analytical platform to handle increasing data volumes and diverse use cases.Utilize your expertise in building and operating high-scale systems with a focus on reliability, scalability, and cost efficiency.Collaborate with stakeholders to create innovative solutions on top of our platform.Contribute to a positive and inclusive work culture, mentoring and uplifting your peers.Your QualificationsB.S., M.S., or PhD in Computer Science or a related field.2+ years of experience at the I4 level, or 5+ years at the I5 level in software engineering.Proven experience in big data technologies (streaming, batch processing, data lakes, OLAP) and promoting real-time data insights.
Join the Innovative Team at Nooks.ai:Nooks is revolutionizing the sales landscape with our cutting-edge AI Sales Assistant Platform (ASAP). By automating repetitive tasks, we empower sales representatives to focus on building relationships and closing deals, leading to increased sales pipelines. Our platform has enabled countless sales professionals to meet their targets, saving our clients hundreds of thousands of hours and generating substantial revenue. We take pride in being the preferred choice for sales teams at industry leaders like Hubspot, Rippling, and Toast, among many others.With over $70M raised from prestigious VCs such as Kleiner Perkins, we are on an impressive growth trajectory, having quadrupled our Annual Recurring Revenue (ARR) in the last two years and aiming for another tripling this year.Discover more about us at Nooks.ai.About the Position:We are seeking a talented Software Engineer to enhance our Core Dialer team. Your mission will be to elevate the user experience of our dialer functionalities—including dialing, task management, configuration settings, connected views, smart lists, and browser extensions—ensuring our sales tools are fast and reliable.Your Responsibilities:Develop and maintain essential dialer features that sales representatives use daily.Collaborate with design and product teams to implement user experience enhancements with meticulous attention to detail.Optimize backend APIs and frontend performance to minimize latency and streamline complex processes.Work cross-functionally with Integrations and Voice Infrastructure teams to ensure seamless operations.Take ownership of enhancing the dialer experience systems.Gain valuable experience with distributed systems and integrations.We Are Looking For Candidates Who Have:3 to 5 years of engineering experience, preferably in SaaS applications.Proficiency in modern frontend technologies (React) and backend development (Node/TypeScript, REST APIs).A solid understanding of data modeling and caching solutions (Postgres, Redis).A passion for working closely with users and rapidly iterating on features.At Nooks, we offer competitive compensation packages that include base salary, equity, and comprehensive benefits. Join us in shaping the future of sales technology!
About UsAt Heidi, we believe healthcare deserves a more harmonious approach—one that ensures care is both ongoing and profoundly human. Our mission is to create an AI Care Partner that collaborates seamlessly with clinicians to achieve this goal.Our diverse team consists of doctors, engineers, designers, researchers, and creatives dedicated to developing tools that allow clinicians to concentrate on their primary focus: their patients.In just a year and a half, Heidi has successfully reclaimed over 18 million hours for healthcare professionals, facilitating 73 million patient visits across 116 countries. Currently, more than two million patient visits weekly are powered by Heidi globally.With nearly $100 million in funding, we are expanding our reach across the US, UK, Canada, and Europe, partnering with esteemed health systems such as the NHS, Beth Israel Lahey Health, and Monash Health.
About Retell AIAt Retell AI, we are pioneering the future of call centers through innovative voice AI technology. Our cutting-edge solutions are transforming how companies engage with customers.In just 18 months since our inception, we've empowered thousands of businesses with our AI voice agents that efficiently manage sales, support, and logistics calls, significantly reducing the need for large teams of human agents. Supported by industry-leading investors including Y Combinator and Alt Capital, we've grown our annual recurring revenue from $5M to an impressive $36M while expanding our team from 5 to 20 talented individuals since 2025.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform where entire contact centers are driven by AI. Unlike basic automation requiring constant human oversight, we’re engineering intelligent AI “workers” capable of serving as frontline agents, quality assurance analysts, and managerial roles, all while optimizing customer interactions continuously.We are rapidly expanding and seeking driven builders who thrive on solving complex technical challenges, act decisively, and wish to make a tangible impact in one of the fastest-growing voice AI startups.Join us in shaping the future!Recognized as a top 50 AI application in the a16z list: https://tinyurl.com/5853dt2xRanked #4 in Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025Featured among the top startups on: https://leanaileaderboard.com/
Join our dynamic team at Sonsoft Inc. as a J2EE Developer, where you will leverage your expertise in Core Java, Spring Boot, and MAVEN to build robust applications. You will be a crucial part of our development team, contributing to the design and implementation of innovative software solutions that meet client needs.
Full-time|$227.2K/yr - $417K/yr|Hybrid|San Francisco, CA; Los Angeles, CA; New York, NY (Hybrid); USA - Remote
About the Role:Join our dynamic ML Infrastructure team as a Software Engineer, where you'll collaborate intimately with the Machine Learning and Product teams to construct top-tier machine learning inference platforms. These cutting-edge platforms drive vital services such as personalized recommendations, search functionalities, and content comprehension at Tubi.Your primary focus will be on the development and maintenance of low-latency ML model serving systems that cater to Deep Learning, LLM, and Search models. This will include the creation of self-service infrastructure and critical components such as the inference engine, feature store, vector store, and experimentation engine.In this role, you'll enhance our service deployment and operational processes, with opportunities to contribute to open-source projects. Enjoy architectural freedom to explore innovative frameworks, spearhead significant cross-functional projects, and elevate the capabilities of our ML and Product teams.We are currently hiring for two positions:Staff Software EngineerPrincipal Software EngineerAdditional Details: As a Principal Engineer, you will serve as a technical leader and visionary, guiding the advancement of our machine learning platform. You'll address complex technical challenges, shape architectural decisions, and mentor senior engineers, fostering a culture of excellence and continuous improvement. Your contributions will impact millions of users.
Full-time|$216.2K/yr - $270.3K/yr|On-site|San Francisco, CA
Scale GP is at the forefront of enterprise Generative AI, offering cutting-edge APIs and infrastructure for knowledge retrieval, inference, evaluation, and intelligent automation. We empower critical workflows for leading enterprises, transforming intricate data and models into dependable, production-ready AI systems. Join our newly formed Agentic Data Products team, dedicated to creating the next generation of agent-powered tools that seamlessly integrate AI into real operational workflows. Our mission is to enable enterprises to unravel their data layers and deploy intelligent systems capable of reasoning, acting, and delivering measurable outcomes. This is a pioneering build team, and we are seeking a highly skilled, product-focused Senior Engineer who thrives in dynamic environments, acts swiftly, and relishes the challenge of constructing new systems from the ground up in collaboration with customers and cross-functional teams. You will partner closely with product managers, forward-deployed engineers, data scientists, and applied AI specialists to transform real-world challenges into scalable, production-ready solutions. If you have a passion for rapid delivery, accountability for outcomes, and enjoy working across the entire stack—from sleek front-end applications to robust distributed backends and LLM integrations—this role is perfect for you.
About the Role OpenAI is looking for a Software Engineer specializing in Kernel Performance and AI Tooling to join the team in San Francisco. This role centers on improving software systems for maximum efficiency and building advanced tools that support AI development. What You Will Do Optimize kernel-level performance across OpenAI's software stack. Design and implement tools that accelerate AI research and deployment. Work closely with engineers to identify bottlenecks and deliver practical solutions. Contribute to technical discussions and share knowledge with teammates. Team and Collaboration Work alongside engineers who are committed to advancing AI technology. Collaboration and innovation are central to the team’s approach.
Our mission: to eliminate every barrier to mental health.At Spring Health, we are dedicated to transforming mental healthcare by dismantling every obstacle that hinders individuals from receiving the support they require, precisely when they need it. Our clinically validated technology, Precision Mental Healthcare, empowers us to deliver tailored care—be it therapy, coaching, medication, or more—customized to the unique needs of each individual.We are proud to collaborate with over 450 organizations, ranging from innovative startups to Fortune 500 giants, as a premier provider of mental health services, impacting the lives of 10 million individuals. Our esteemed clients include renowned brands such as Microsoft, Target, and Delta Airlines, who trust us to provide exceptional outcomes for their workforce worldwide. Through our groundbreaking platform, we have achieved a net positive ROI for employers, and we are the sole entity in our field to receive external validation for delivering genuine cost savings to our clients.With significant investments from leading firms like Generation Investment, Kinnevik, Tiger Global, Northzone, RRE Ventures, and more, we have recently completed a Series E funding round, elevating our valuation to $3.3 billion. We are just beginning our journey—join us as we strive to make mental healthcare accessible to everyone, everywhere.In this pivotal role, you will report to the Associate Director of Data Science - Orchestration and spearhead backend systems that facilitate member-provider matching and precision care routing. As a key member of the Orchestration Group, you will play an essential role in translating machine learning and business logic into scalable, reliable production services that enhance member experience, utilization, and margin performance.This is a hybrid position based in San Francisco, with a requirement to be on-site 2–3 days per week at our 2 Embarcadero Center location. Candidates must reside in the San Francisco metro area or be willing to relocate independently within 90 days of their start date. Occasional travel for team gatherings will be necessary.
Full-time|$162.8K/yr - $203.5K/yr|On-site|San Francisco, CA
At Lyft, we are driven by our mission to connect and serve our communities. We strive to foster a workplace where every team member feels valued and has the opportunity to excel. With over half a billion rides and counting, Lyft is tackling complex challenges on a grand scale, utilizing cutting-edge AI and Machine Learning technologies to enhance customer experiences. The Artificial Intelligence, Machine Learning, and Operations Research Platforms team (AIMLOR) is on the lookout for a Senior Machine Learning Engineer who will play a pivotal role in constructing AI Platform components that empower essential AI applications across Lyft. Mastery in Generative AI and platform development is crucial for this position. You will contribute to our platform that facilitates real-time, online, and offline AI and ML model execution, development, and iteration. Collaborating with a team of talented Machine Learning and Software Engineers, you will work on intricate problems and define solutions that make a direct impact on our systems throughout the organization. If you are enthusiastic about building an AI Platform at scale with applications spanning every aspect of our company, we want to hear from you. If you are a creative thinker with a strong background in AI and machine learning systems and are passionate about leveraging data to solve business challenges in a dynamic, innovative, and collaborative environment, we invite you to apply.
About UsOur mission is to revolutionize language learning.Learning a new language can transform lives by providing access to diverse cultures, career opportunities, and communities. With two billion people globally striving to learn languages, the most effective method—one-on-one tutoring—remains difficult to access at scale and has not evolved significantly over the years. Speak is developing an AI-powered, human-like tutor that fits in your pocket, offering a conversation-first approach that allows learners to practice speaking, receive immediate feedback, and progress through thoughtfully designed lessons. This results in a comprehensive journey from novice to confident speaker across multiple languages.Since our launch in South Korea in 2019, Speak has emerged as the leading language learning app, now available to learners in various markets and over 15 languages. As one of the foremost AI companies globally, we have secured over $150 million in venture capital from notable investors such as OpenAI, Accel, Founders Fund, and Khosla Ventures, with a diverse team spread across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.About This RoleWe are seeking a Senior Backend Engineer, with full-stack capabilities, to help create innovative AI-driven product experiences. The ideal candidate should have experience collaborating closely with product, design, and machine learning teams, alongside a proven track record in developing polished consumer applications. This role is pivotal in shaping our latest products focused on programmatic, conversational language learning and will significantly impact the future direction of our company.Your ResponsibilitiesCrafting innovative AI-driven product experiences and user interfaces for the web.Full-stack engineering with a primary focus on designing scalable backend systems.Troubleshooting complex streaming challenges.Taking ownership of the complete development cycle of features from ideation to production.Writing code efficiently, shipping frequently, and making a substantial impact on our business by facilitating the scaling of our content.Your Profile5+ years of industry experience as a Backend Engineer, ideally within a fast-paced startup environment.Bonus: Experience on an app that has reached over 1 million users.Exceptional problem-solving and communication skills, along with the ability to work effectively in a collaborative environment.
Full-time|Remote|San Francisco, CA or Remote (USA)
About FieldguideAt Fieldguide, we are transforming the landscape of global commerce by revolutionizing the approaches to cybersecurity, privacy, and financial audits. Our innovative software solutions empower professionals to establish trust within businesses, enhancing their efficiency and delivering superior results.As a remote-first company based in San Francisco, CA, we are supported by prestigious investors such as Bessemer Venture Partners, 8VC, Y Combinator, and Floodgate. We pride ourselves on cultivating a diverse workforce and are committed to fostering an inclusive, humble, and high-performing company culture.About the RoleWe are seeking to onboard Software Engineers at various levels to contribute to our expanding team. Depending on your background and aspirations, you could work as a mid-level engineer, assume leadership responsibilities, or influence the technical direction across teams and systems. The specific level will be assessed during the interview process based on your experience and capabilities.This position offers a unique opportunity to make a significant impact in a company that has achieved product-market fit and is poised for substantial growth, challenging outdated audit and accounting tools that have long been overlooked.Your ResponsibilitiesCraft, develop, and implement high-quality features that create value for customers and drive business success.Work collaboratively with product and design teams to transform complex challenges into user-centered solutions.Maintain a balance between rapid iteration and sustainable system health.Continuously enhance our technology stack, developer workflows, and reliability standards.Foster a nurturing, growth-focused engineering culture based on trust, continuous learning, and excellence.
