Senior Full Stack Software Engineer

HUD builds infrastructure to support reinforcement learning training data and evaluation, serving advanced AI agents. The team is also developing a marketplace for these resources, working with leading AI labs, Fortune 500 companies, and startups. Backed by $15 million from top investors, HUD is part of Y Combinator's W25 cohort. Role overview This Full-Stac…

Join Kiddom as a Senior Front End Software EngineerAt Kiddom, we are revolutionizing education with our innovative platform designed to foster student equity and growth. By integrating high-quality instructional materials with engaging digital learning experiences, we empower schools and districts to take charge of their curriculum. Our platform not only enhances educational outcomes but also provides invaluable data insights for teachers and leaders to refine their instructional strategies and professional development.As a Senior Front End Software Engineer, you will play a key role in crafting impactful product experiences utilized by educators, students, and administrators on a daily basis. Collaborating closely with product managers, designers, and backend developers, you will create scalable and user-friendly front-end systems. This position is perfect for a detail-oriented individual who values craftsmanship and excels in a collaborative, mission-driven environment.

About UsAt salient, we are pioneering the AI infrastructure that will revolutionize financial operations, starting with the automation of intricate workflows in loan servicing.Supported by top-tier investors like a16z and Y Combinator, we have successfully raised $65 million in Series A funding.Achieving an 8-figure Annual Recurring Revenue (ARR) in under two years, we currently serve over 20% of the auto lending industry, efficiently processing millions of customer calls and transactions daily.Our solutions are fully operational with leading financial institutions, going beyond mere proofs of concept.We are rapidly expanding into new segments of financial services!Embrace our vibrant in-person office culture located in San Francisco, CA.Our team is fully integrated with our clients, managing the entire stack, and moving swiftly to introduce modern AI into regulated sectors where accuracy, consistency, and performance are paramount.About the RoleWe are seeking a dedicated Front-End Software Engineer to create dynamic, user-friendly interfaces that empower users to interact with complex data effectively. You will collaborate closely with product, design, and AI teams to develop elegant user interfaces, define frontend architecture, and deliver features that significantly enhance user experiences at scale.As an early and visible member of a nimble engineering team, you will take ownership of features from inception to delivery, contribute to UI strategy, and help mold the future of our products as we expand our offerings beyond voice.What You’ll DoCraft responsive and high-performance user interfaces utilizing React and TypeScriptSimplify complex workflows into user-friendly product experiencesEngage in cross-functional collaboration with product, design, and AI teams to innovate and iterate quicklyContribute to defining frontend architecture and develop reusable UI componentsCreate data visualizations that clarify and make financial data actionableCollaborate with backend engineers for seamless API and service integrationsDeliver clean, testable, and maintainable code in a rapid release cycleChampion the user perspective in product and engineering discussionsWhat You’ll Bring4+ years of experience in developing production-level front-end applicationsProficient in React and TypeScript, with a solid understanding of modern web technologiesDemonstrated ability to translate complex requirements into user-friendly solutions

About HappyRobotHappyRobot is pioneering the AI-native operating system tailored for the real economy, seamlessly bridging the gap between intelligence and actionable outcomes. By harnessing real-time data, specialized AI agents, and a central orchestrating intelligence, we empower enterprises to manage intricate, mission-critical operations with unparalleled autonomy.Our AI OS accumulates knowledge, optimizes processes across various levels, and adapts over time. We are initially focusing on supply chain and large-scale industrial operations, where resilience, speed, and ongoing enhancement are paramount—allowing human talent to concentrate on strategic, creative, and other high-value endeavors.Discover our vision further in our Manifesto. HappyRobot has successfully raised $62 million to date, including a recent $44 million in Series B funding in September 2025. Our esteemed investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10—partners committed to our mission of transforming enterprise operations. We are channeling this investment into assembling a top-tier team: individuals driven by relentless ambition, adept problem-solving skills, and a passion for pushing boundaries in a dynamic, high-energy environment. If this resonates with you, we invite you to be part of HappyRobot.About The RoleAt HappyRobot, our Full Stack Engineers take ownership of significant components of our product and infrastructure, delivering from end to end.We seek innovators who thrive in uncertain environments, have a deep appreciation for their craft, and desire genuine ownership of their creations.

Join DepthFirst AI as a Product EngineerAt DepthFirst AI, we recognize software as the cornerstone of modern civilization, yet we are aware of the vulnerabilities that jeopardize its security and resilience. Our mission is to combat these threats through innovative solutions.We are pioneering AI technology that autonomously detects and resolves critical software vulnerabilities. Our advanced security AI agents are designed to discover zero-day vulnerabilities across extensive customer codebases and popular open-source software.Our founding team boasts expertise from leading companies like DeepMind, Databricks, Square, and Faire, and we seek talented individuals eager to explore the crossroads of AI, security, and infrastructure.Your Role:We are looking for an experienced Product Engineer with a focus on front-end development to spearhead the creation of our groundbreaking AI-native platform. This platform autonomously identifies and rectifies software vulnerabilities in code, currently serving a diverse array of large clients. You will play a vital role in shaping the product, understanding user needs, and reinventing security practices for organizations.Responsibilities:Product Development: Design and develop AI-driven products that address significant challenges, helping companies prevent major leaks.Performance Optimization: Own front-end performance and ensure our website exceeds industry standards for speed and responsiveness.Technology Utilization: Utilize Next.js, React, and the latest web development methodologies to build robust, scalable, and high-performance solutions.Impactful Work: Contribute to a product that addresses a critical issue, with large clients already uncovering significant vulnerabilities shortly after implementation.

About UsAt Valdera, we empower manufacturers to turn their visions into reality by revolutionizing the way they source materials. Our innovative platform simplifies the process of finding top-quality materials and suppliers, enabling manufacturers to create exceptional products at scale and distribute them globally.As a rapidly expanding team, we have established successful partnerships with Fortune 500 industrial manufacturers, beauty brands, and chemical companies. We seek driven and talented individuals who excel in high-performance settings and are eager to advance their careers swiftly.Our culture encourages top talent to tackle significant challenges, collaborate with industry leaders, and witness the tangible impact of their contributions. If you are seeking a dynamic environment where your ideas can foster change, Valdera is the perfect place for you.Join us in shaping the future of manufacturing.

Join prosper as a Senior Full Stack Software Engineer, where your expertise will drive innovation and enhance our technology solutions. In this role, you will collaborate with cross-functional teams to develop scalable applications, ensuring high-quality code and performance. Your contributions will help shape the future of our platform and improve user experiences.

About PrimerPrimer is an innovative network of K–8 schools dedicated to revitalizing the fundamental principles of American education. Drawing inspiration from the original teaching primers that cultivated generations of readers, thinkers, and builders, our schools focus on proven methods while preparing for future challenges. We foster close-knit learning environments, empower skilled educators, and maintain a culture that respects children as both learners and leaders.For over 200 years, primers have shaped the American educational landscape. Now, Primer is preparing children for the next chapter.The software we develop underpins our Microschools, facilitating operations from day one. It assists teachers in sourcing real estate, recruiting students, and delivering genuinely personalized education. Our platform provides valuable insights to parents, supports virtual teachers in offering exceptional experiences, and streamlines our back-office operations. We have a broad scope of work ahead and a commitment to making a significant impact.We are assembling a small, talented team of hands-on engineers to play a pivotal role in the evolution of Primer.Role OverviewWe are in search of a skilled Full Stack Engineer to join our dynamic team. In this capacity, you will help reimagine the school experience through modern technology. You will create features that teachers, students, and families depend on daily while addressing tangible challenges in education.This position is based in San Francisco and requires in-office attendance five days a week.ResponsibilitiesTechnical Stack: Engage with technologies including TypeScript, NodeJS, GraphQL, Prisma, Postgres, NextJS, React, and Relay.Collaborative Environment: Collaborate daily with team members across engineering, product, design, and our academic program.Ownership and Growth: Take complete ownership of projects and enhance your skill set. You will have opportunities to lead initiatives that shape the product, with ample room for professional development.Engineering Culture: Contribute significantly to establishing our engineering culture as we expand our team.Deliver Quality Products: We uphold high standards for quality, so be prepared to work diligently to achieve excellence.QualificationsPassion for Education: You possess a genuine passion for transforming the U.S. education system. While this work is challenging, successful outcomes will prove to be the most rewarding of your career.

Join our dynamic team at Braze as a Senior Full-Stack Software Engineer! In this pivotal role, you will collaborate with cross-functional teams to design, develop, and implement innovative software solutions. You will leverage your expertise in both front-end and back-end technologies to create seamless user experiences and optimize system performance.

Mithril is on the lookout for exceptional candidates at the Senior to Principal level. The exact level will be determined based on your experience and proven expertise. We value individuals who offer deep technical knowledge, strategic insights, and a history of impactful contributions. Our roles are tailored to fit each candidate’s unique strengths and career aspirations. About Mithril At Mithril, we are revolutionizing how AI companies harness compute power. Our mission is to orchestrate global compute capacity, making it more accessible and optimized for AI workloads. We are constructing a novel public cloud specifically designed for AI, where accessing high-performance compute is as straightforward and reliable as flipping a switch. Originating from a Stanford PhD lab just over a year ago, Mithril has already attracted backing from premier investors, including Sequoia, Lightspeed, Jeff Dean, and Eric Schmidt, among others. With $80 million in funding, we are securing customers and generating revenue. The current machine learning infrastructure is overly complex, forcing engineers to make hard choices about hardware when they should focus on solving major problems and driving innovation. Our Omnicloud Platform addresses this issue by abstracting hardware management and providing seamless access to computational resources, enabling engineers to concentrate on what truly matters—developing transformative AI solutions. We are not only making compute accessible; we are also making it flexible, scalable, and tailored to meet the unique demands of AI. Our infrastructure marketplace provides state-of-the-art hardware without the usual friction, allowing companies to innovate faster and more efficiently. Working at Mithril As a Full Stack Engineer at Mithril, you will play a crucial role in developing the applications and systems that will shape the future of AI. Your responsibilities will include scaling our platform and ensuring a seamless user experience supported by a robust and efficient infrastructure. In a landscape where AI workloads are increasingly complex, crafting reliable and high-performance software is foundational to our mission. The Omnicloud Platform supports cutting-edge AI workloads, managing vast amounts of data while providing a user-friendly interface for developers and researchers. Full Stack Engineers at Mithril design and implement solutions across the entire stack—from creating intuitive front-end interfaces to architecting scalable backend systems. We expect every engineer to approach problems holistically, balancing performance, scalability, and simplicity, while maintaining a strong focus on user experience.

Important NoticeThis is a full-time, on-site position located in San Francisco (Presidio), where you will work in our office five days a week.Candidates must be residents of the Bay Area or willing to relocate prior to starting.We require valid US work authorization, and we are open to sponsoring an O-1 visa for exceptional candidates.Role Overview: Senior Full Stack Engineer (Back-End)Your ResponsibilitiesIn this role, you will develop and deploy full-stack features from backend APIs to the user interfaces that enhance user interactions on a daily basis.As part of a small team of roughly 15, you will not only implement new features but also influence key architectural decisions that will support scaling our system to handle significantly increased loads.You will collaborate closely with our CTO on various initiatives, including:Establishing and managing sandbox environments for agent code execution, ensuring security, resource limits, and process isolation for thousands of concurrent sessions.Designing deployment and migration processes for a Cloudflare Workers and Fly.io architecture, incorporating blue-green deployments and canary testing.Implementing end-to-end instrumentation for real-time workloads, including SSE streaming and task queues.Delivering new backend features, tool integrations, and memory indexing, with immediate impact on real users.Minimizing operational overhead through effective logging, monitoring, and incident response tools tailored for our scale.Your innovative ideas!Technology StackWe leverage a range of technologies including TypeScript, Cloudflare Workers, Durable Objects, Hono, Drizzle ORM, Postgres, Zod, SST, Vercel AI SDK, Docker, React, and Vite.Candidate ProfileEssential QualificationsA minimum of 5 years of engineering experience developing and maintaining backend systems in a production environment, with on-call responsibilities.Proficient in TypeScript with a strong preference for backend development, while also being capable across the entire stack.

Join Arena IntelligenceAt Arena Intelligence, we are pioneers in assessing the real-world performance of AI models. Founded by esteemed researchers from UC Berkeley's SkyLab, our goal is to enhance and measure the capabilities of AI technologies for practical applications.Each month, millions leverage Arena Intelligence to understand frontier system dynamics, using our community's insights to foster transparent, rigorous, and human-centric evaluations. Leading organizations and AI laboratories depend on our assessments to gauge real-world reliability, alignment, and implications. Our leaderboards set the benchmark for AI performance, earning trust from industry leaders and influencing global discussions on model reliability and advancements.Our team comprises researchers, engineers, scholars, and innovators from renowned institutions such as UC Berkeley, Google, Stanford, DeepMind, and Discord. We prioritize truth-seeking, agility, and craftsmanship, valuing curiosity and impactful contributions over hierarchy. We're fostering a workplace where thoughtful and diverse individuals can excel. Each team member is a domain expert, contributing to an environment rich in excellence, energy, and focus.Role OverviewWe are looking for a Senior Full-Stack Product Engineer to spearhead the technical design and development of AI-focused products within our platform. This role involves taking ownership of features from inception to deployment—encompassing the proposal of technical solutions, implementation of core product workflows, and analysis of new functionalities' impacts. Ideal candidates should possess substantial experience in constructing reliable business logic at scale and be enthusiastic about influencing user interaction with state-of-the-art AI models.

Join Our Team at Owner.comAt Owner.com, we are revolutionizing the way local restaurants grow through our innovative AI growth system, designed specifically for their needs.Our AI enhances SEO, marketing, and online ordering systems to maximize first-party orders, empowering small business owners with a user-friendly platform managed by experts. We provide a suite of tools that levels the playing field against larger chains.Our VisionWe aim to enable independent restaurants to thrive online, and our vision extends beyond them. Many local businesses face similar challenges, and we aspire to provide solutions that can assist them as well. Our goal is to develop technology that tens of millions of local business owners can leverage for success in the digital landscape.Our AchievementsSince our inception in 2020, we have generated substantial revenue and facilitated over half a billion dollars in online orders. Over 20,000 restaurant owners have benefited from our services, saving nearly $200 million in fees.Our TeamComprising top talent from leading companies in the SMB software sector, our team is poised for rapid growth as we expand further in 2026.Work EnvironmentAs a remote-first company headquartered in San Francisco with a sales hub in Toronto, we foster a flexible work culture. Most of our team members are distributed globally. For specific roles, we encourage in-person collaboration, so please consult with your recruiter regarding location details.

Why Join Brex?At Brex, we are redefining how companies manage their spending through our AI-driven spend platform. Our integrated solutions, including corporate cards, banking, and global payment systems, empower businesses—ranging from startups to large enterprises like DoorDash, Flexport, and Compass—to effectively control their expenses and enhance operational efficiency.Joining Brex means being part of an innovative environment where you can challenge yourself, disrupt conventional thinking, and collaborate with some of the industry's brightest talents. We are dedicated to fostering a diverse team and inclusive culture, believing that your potential should be limited only by your dreams. We provide you with the tools, resources, and support necessary for your professional growth.Engineering at BrexOur engineering division focuses on creating scalable systems with purpose and speed. Our collaborative teams across Software, Data, Security, and IT work with high autonomy, tackling complex technical challenges and striving for excellence in every aspect, from architecture to deployment. Here, engineering is not just a job—it's a craft that cultivates leadership among builders.Your RoleAs a Senior Full Stack Software Engineer on the Task Workflows Platform team, you will develop and enhance the foundational infrastructure that supports crucial user experiences at Brex. Your responsibilities will include working on a diverse range of platforms, such as our multi-channel notifications engine, collaborative commenting system, and dynamic workflow rule builder. You will be instrumental in transitioning our task orchestration framework from a centralized model to more specialized solutions tailored for specific product domains.You will confront intricate full-stack challenges, from designing scalable backend APIs and automation rule engines to developing intuitive frontend user experiences for domain-specific task interfaces and workflow builders. Beyond core platform duties, your contributions will significantly influence broader product experiences, including utilizing AI to enhance user workflows and supporting the ongoing evolution of our productivity tools across web and mobile platforms.Work EnvironmentThis position is located in our San Francisco office. We adopt a hybrid work model that combines the dynamic interactions of in-office work with the flexibility of remote arrangements. Currently, we require a minimum of three coordinated days in the office each week.

Astranis is at the forefront of space innovation, crafting advanced satellites for high orbits that extend humanity's capabilities within our solar system. Our satellites are designed to deliver dedicated and secure networks to highly sophisticated clients globally, including large enterprises, sovereign governments, and the US military. With five satellites currently in orbit and more on the horizon, we are addressing a backlog exceeding $1 billion in commercial contracts.We are recognized as the leading satellite communications partner for clients demanding exceptional uptime, data security, network visibility, and tailored solutions. Having raised over $750 million from top-tier investors such as Andreessen Horowitz, Blackrock, and Fidelity, our team comprises 450 skilled engineers and entrepreneurs. Our headquarters, spanning 153,000 sq. ft., is located in Northern California, USA, where we design, build, and operate our satellites.Senior Full Stack Engineer - Network SoftwareAs a Senior Full Stack Engineer specializing in Network Software, you will play a pivotal role in designing and implementing the software that powers our satellite and ground networks. The tools you develop will be essential for our customers to monitor satellite performance and for our internal teams to plan, design, and optimize our satellite networks and their capabilities.This position will significantly contribute to both commercial projects and US Government initiatives.RoleLead the architecture, development, and implementation of software for satellite and network management.Oversee backend and UI development for internal tools related to test infrastructure, mission control, and business operations.Create user-friendly web-based interfaces for telemetry dashboards, test orchestration, command execution, and workflow monitoring.Automate manual processes to enhance operational efficiency across engineering, network, and satellite operations.Collaborate closely with mission operations teams to create software that aids in the design, construction, and management of Satellites and Networks.Design high-performance, reliable, mission-critical software that transmits commands to space.Engage with multidisciplinary teams to define software requirements, architectures, and designs.RequirementsBachelor’s degree in Computer Science or a related technical field.7+ years of experience as a full stack developer in industry.Proficient in system-level architecture, software design, and implementation.

The Trade Desk is looking for a Senior Front End Software Engineer to join the Deal Desk team. This group builds web interfaces that support the company’s products and works on projects that require both creativity and strong technical skills. Collaboration is central to the team’s approach, with engineers, designers, and product managers working together to solve challenges and improve the product. What you will do Design and build user interfaces for Deal Desk products using current front-end frameworks and tools Collaborate with engineers, designers, and product managers to deliver features that enhance the user experience Take part in shaping the direction and architecture of web applications Maintain high standards for code quality and reliability through solid engineering practices Locations This position is available in Irvine, New York, San Francisco, San Jose, and Ventura.

Join Cloudflare as a Senior Full Stack Software Engineer and be at the forefront of our mission to help build a better Internet. We are looking for talented engineers who thrive in a collaborative environment and are eager to tackle complex challenges.Your role will involve designing, developing, and optimizing applications across the full stack. You will work closely with cross-functional teams to create innovative solutions that enhance our platform's capabilities.

At Sift, we are revolutionizing the construction, testing, and operation of modern machines. Our innovative platform empowers engineers with real-time visibility over high-frequency telemetry, helping to eliminate bottlenecks and facilitating rapid, reliable development.Founded by a team with backgrounds at SpaceX, Google, and Palantir, Sift emerged from the need for robust infrastructure in mission-critical systems, where precision and scalability are paramount. With roots in projects like Dragon, Falcon, Starlink, and Starship, we focus on delivering solutions that address complex engineering challenges.As a pivotal member of our engineering team, you will not only write code but also define architecture, shape product development, and influence a culture dedicated to solving real-world engineering problems. If you are eager to tackle intricate technical challenges and contribute to building foundational systems for complex machines, we would love to hear from you.

Why Choose Flux?At Flux, we're redefining the landscape of hardware development by pioneering the world's first AI Hardware Engineer. Our mission is to make cutting-edge hardware design accessible to everyone, transforming the way electronics are conceived and manufactured globally.Role OverviewWe are developing an AI-driven ECAD platform that empowers hardware teams to collaboratively create real, manufacturable electronic components directly in a browser environment. As a Senior Front End Product Engineer, you will play a pivotal role in enhancing the web application experience, focusing on core editor interfaces, collaboration features, and user interfaces designed around AI-powered workflows.Your primary tools will be React and TypeScript, working in close collaboration with design teams and ECAD engineers to ensure our complex, real-time application remains intuitive and efficient for users.We are also open to mid-level candidates who demonstrate significant ownership of similarly intricate products.