Backend Software Engineer at braintrust | San Francisco

About braintrustBraintrust is at the forefront of AI observability, merging evaluation and observability into a seamless workflow. Our platform empowers developers to gain critical insights into AI behavior in production environments and provides tools for optimization.Renowned companies such as Notion, Stripe, Zapier, Vercel, and Ramp leverage Braintrust to…

About Ivo Inc. Ivo Inc. builds generative AI technology for the legal sector. Based in San Francisco, the team focuses on practical solutions that help legal professionals work more efficiently. The company’s platform automates and streamlines contract analysis, document editing, and risk detection for in-house legal teams. Recent Engineering Projects AI agents that integrate with MS Word for automated document editing (2023) Shifting from generic embeddings to agentic RAG for better accuracy (2023) Large-scale LLM-based legal fact extraction (2024) Legal assistant for searching large contract databases with high precision (2024) Clustering legal documents from the same source for improved organization (2025) Automatic deviation analysis to surface hidden risks in contract archives (2025) System for merging contracts and amendments into unified composite contracts (2025) Role Overview: Staff Software Engineer - Fullstack This role focuses on designing and building full-stack features using generative AI. Staff Engineers at Ivo work across the stack and partner closely with product, design, and legal experts. What You Will Do Design and implement full-stack generative AI features Build high-performance user interfaces and backend systems that process millions of legal contracts Create and maintain data pipelines that coordinate LLMs, data extraction, and clustering at scale Work with designers, legal professionals, and engineers to improve legal workflows with AI Our Mission Ivo’s goal is to help in-house legal teams reclaim time from repetitive work. The team uses advanced LLMs to automate tedious legal tasks, so lawyers can focus on higher-value work. The platform’s impact is clear: Ivo holds an 85% trial win rate, the highest in the market, and receives consistently positive user feedback.

Astranis is revolutionizing space communications by constructing advanced satellites for high orbits, enabling humanity to expand its reach into the solar system. Our satellites currently deliver dedicated, secure networks to a diverse range of sophisticated clients globally, including large corporations, government entities, and the US military. With five satellites successfully in orbit and many additional launches on the horizon, we are addressing a robust backlog of over $1 billion in commercial contracts.As the preferred satellite communications partner for customers with stringent uptime, data security, network visibility, and customization requirements, Astranis has successfully secured over $750 million in funding from top investors, including Andreessen Horowitz, Blackrock, and Fidelity. Our team of 450 engineers and entrepreneurs works out of our impressive 153,000 sq. ft. headquarters in Northern California, USA, where we design, build, and operate our satellites.Backend Software EngineerBefore a satellite can be launched into orbit, it undergoes a comprehensive process that includes financing, procurement, manufacturing, and testing. As a Backend Software Engineer, you will play a pivotal role in constructing the software systems that facilitate spacecraft development, testing, and manufacturing, ensuring seamless integration with our supply chain. This high-impact role encompasses multiple domains—from procurement and manufacturing to cloud services and data pipelines—contributing significantly to efficient engineering workflows, business intelligence, and scalable flight operations.In this role, you will collaborate closely with cross-functional teams, including hardware engineers, manufacturing specialists, operations personnel, and satellite flight control teams, to develop internal tools that streamline processes and accelerate development. You will be responsible for owning and delivering scalable systems that enable us to efficiently build, test, and launch satellites.This position supports both commercial and US Government satellite programs.

Join Strala and Revolutionize Insurance!Strala is on a mission to transform the world’s largest industry - insurance. In less than a year, we have achieved a remarkable multi-seven-figure ARR and continue to grow at an impressive rate of 50% month over month. Backed by top-tier investors, including Peter Thiel’s Founders Fund, we are proud to have a team composed of alumni from prestigious institutions like Harvard, Berkeley, and Oxford, along with experienced professionals from renowned firms such as Optiver, AMD, and Palantir.What We're SeekingProblem Solver: You thrive on tackling challenging problems and have a proven history of success.High Agency & Ownership: You take initiative and make things happen, with bonus points if you have experience as a CTO or founding engineer.Proven Builder: You possess at least 2 years of experience in backend development with Python, demonstrating a track record of delivering fast, production-grade code.Core System Design: You will be responsible for our core infrastructure, databases (PostgreSQL, vector DBs), and overall architecture.Cloud Mastery: You are well-versed in REST, GraphQL, GCP, AWS, and Docker.Your First Month at StralaShip from Day 1: You will be deploying to production on your first day and taking full ownership of your code.Ownership: You will create specifications, solve problems, and build features.Solve Every Problem: You will be involved in hiring your next teammate, designing core infrastructure, and scaling the existing codebase.Our ValuesAmbition: We aim to win and strive to be the best.Performance: We value speed, system thinking, and efficiency.Ownership: We take responsibility for problems and work to solve them.Spirit: We foster clarity, optimism, and meritocracy.What We OfferImpact: Shape a company, redefine an industry, and make your code resonate with millions.Intensity: Engage in complex challenges and work alongside exceptional talent.

At Scribd, Inc., we aim to enhance human understanding. Our innovative products—Scribd®, Slideshare®, Everand™, and Fable—empower billions globally to not just access knowledge, but also to apply it and achieve expertise.Company CultureWe foster an environment where our employees can be authentic and courageous, engaging in constructive debates while embracing unexpected challenges. Every team member is encouraged to take initiative, prioritizing customer needs.We understand that optimal performance arises from a mix of personal flexibility and meaningful community interaction. Our Scribd Flex program allows team members to choose their working style and location, while still emphasizing in-person collaborations that enrich our culture. Attendance at occasional in-person events is necessary for all employees, regardless of their location.We seek team members who embody “GRIT”—a blend of passion and perseverance towards long-term objectives. This ethos informs our approach to setting and achieving Goals, delivering impactful Results, fostering Innovation, and enhancing our Team dynamics through collaboration.This posting represents an open position within our organization.About Our Team:Our ML Data Engineering team is responsible for metadata extraction, enrichment, and content comprehension across all Scribd offerings. We handle hundreds of millions of documents and billions of images, providing high-quality metadata to facilitate content discovery and trust for millions of users worldwide.Operating at a massive scale, our systems support diverse datasets, including user-generated content (UGC), ebooks, audiobooks, and more. We collaborate closely with applied research and product teams to deploy scalable machine learning and large language model (LLM)-powered solutions in production.Role Overview:We are looking for a Software Engineer II with robust backend development expertise and a keen interest in addressing complex data challenges at scale. You will design, build, and optimize distributed systems that extract, enrich, and process metadata for a variety of content. This role involves close collaboration with ML engineers, product managers, and cross-functional teams.

Why Choose Doppel?At Doppel, we are at the forefront of combating one of the most significant challenges posed by artificial intelligence: the prevalence of sophisticated social engineering tactics. With an alarming rise in scams, deepfakes, and other malicious attacks across various digital platforms—including websites, social media, advertisements, and encrypted messaging apps—our mission is both ambitious and vital: to create a safer internet by outsmarting these rapidly evolving digital threats.Supported by leading investors like a16z and Bessemer, and trusted by globally recognized brands such as OpenAI, United Airlines, and Coinbase, Doppel is expanding rapidly. If you are passionate about leveraging bold technology to tackle real-world challenges, we want to connect with you.Our VisionWe are developing an AI-native platform dedicated to defending against social engineering attacks.This entails creating scalable systems that continuously monitor billions of domains, social media accounts, applications, dark web forums, and more, utilizing AI agents to detect and neutralize digital threats effectively.Your RoleWe are seeking a seasoned backend engineer to design and enhance an automated system aimed at streamlining various Security Analyst functions. Our objective is to verify and neutralize threats within minutes through AI-driven automation. Recent achievements include:Developed a sophisticated LLM engine that quadrupled verification efficiency for our highest volume product line, enabling rapid takedowns at scale.Created a QA and data labeling tool to facilitate a seamless feedback loop among human analysts, machine learning models, and LLM agents.As a member of our San Francisco team (in-office a minimum of three days a week), you will:Play a vital role in developing systems that safeguard billions from AI-generated scams and digital threats.Take ownership of projects from gathering product requirements to continuously evaluating and refining released features.Mentor junior engineers, nurture a high-performance team culture, and contribute to shaping the team’s roadmap.Participate in monthly team dinners, happy hours, and social events (including outings to the Exploratorium, Valkyries games, etc.).What We Provide A mission-driven culture characterized by humility, high accountability, deep customer focus, and an abundance of exceptional talent. Complimentary lunch and dinner provided in the office. Flexible Paid Time Off (PTO).

About CollateCollate is a cutting-edge AI-driven document generation platform specifically designed for the life sciences sector. Our innovative technology automates the paperwork process, enabling our clients to deliver life-saving medical innovations to patients significantly faster. As a comprehensive solution, Collate supports every phase of development for drugs, diagnostics, and medical devices—from initial concept to market launch.Our visionary CEO Surbhi Sarna, a former General Partner at Y Combinator, founded nVision Medical, which pioneered a novel method for detecting ovarian cancer before its acquisition by Boston Scientific. Our CTO Nate Smith, previously a Visiting Partner at Y Combinator and founder of Lever, leads our talented team of AI researchers, engineers, and designers who have backgrounds at industry giants such as Google, Nvidia, Meta, Netflix, Amazon, Airbnb, Hippocratic AI, and Grail. Notably, 40% of our team members are former startup founders themselves.As a compact yet highly skilled team, we have secured over $30M in seed funding from top-tier investors including Redpoint, First Round Capital, Conviction, and Y Combinator, as well as healthcare and AI leaders. This is a unique opportunity to join a company at the forefront of transformative change, guided by experienced founders with the resources to scale effectively.About the RoleWe are seeking a talented Backend Engineer who will play a crucial role in designing and scaling the systems that underpin Collate’s offerings. You will be responsible for developing APIs, services, and the infrastructure that form the backbone of our platform, ensuring they are efficient, dependable, and secure as we transition from prototypes to large-scale implementation.This position is perfect for individuals who thrive on tackling complex system challenges, flourish in an early-stage setting, and wish to see their contributions directly impact advancements in the life sciences field.Modern Tech StackCollate employs a contemporary tech stack aimed at delivering a highly reliable and available platform. Our backend services are built using Go, while we utilize Postgres as our primary database. Frontend development is powered by TypeScript and React, and Python is utilized for AI and machine learning services. Our infrastructure is hosted on AWS, employing Kubernetes for orchestration along with Terraform and Argo CD for configuration management.

Founded in the heart of Silicon Valley in 2009 by visionary entrepreneurs Marc Andreessen and Ben Horowitz, Andreessen Horowitz, commonly referred to as a16z, is a prominent venture capital firm committed to supporting audacious entrepreneurs who are shaping the future through technology. We are stage agnostic, investing across various stages from seed to venture and growth-stage technology companies. Our diverse portfolio spans industries including AI, bio + healthcare, consumer, crypto, enterprise, fintech, games, and initiatives promoting American dynamism. With $90 billion under management across multiple funds, we are at the forefront of innovation and investment.Our team is characterized by a profound respect for entrepreneurs and the intricate process of building companies. We have proudly invested in groundbreaking companies such as Anduril, Airbnb, Coinbase, Cursor, Databricks, Deel, Figma, GitHub, Roblox, SpaceX, and Stripe. We are dedicated to empowering founders and their teams to create significant impacts in the world.

Join Layerfi as a Backend EngineerAt Layerfi, we are revolutionizing the accounting landscape for small and medium-sized businesses (SMBs). With a decade of experience, we’ve established a powerful ecosystem of software tools that facilitate various business operations. However, the accounting sector has fallen behind, leaving SMBs to struggle with disjointed software and costly bookkeeping services.We are creating a cutting-edge accounting software that seamlessly integrates with the existing tools that SMBs rely on daily. Our platform empowers software companies to deliver modern accounting solutions and bookkeeping services to their clients, eliminating the need for outdated tools and expensive bookkeepers.Your RoleWe seek engineers who aspire to build not just products but also a strong team and company. This requires a blend of technical expertise across our tech stack along with unique skills such as:Forward-thinking coupled with a deep understanding of customer needs.A keen curiosity about technical and business challenges.Ability to navigate competing priorities while aligning with company objectives.A strong sense of ownership in product and team decisions.A passion for collaboration and enhancing the strengths of your colleagues.Our ideal candidates typically possess:A minimum of 2 years of experience in robust software development teams.Experience navigating the highs and lows of product development from inception to launch.A proven track record in team leadership and growth.We value proactive individuals who are eager to tackle challenges and seize opportunities, and we welcome those who reach out even if they don’t precisely meet the criteria.Our Technology StackWe do not focus on how familiar candidates are with our specific tech stack. One of the advantages of hiring exceptional engineers is our confidence in their ability to adapt and learn quickly, with support from the team. However, we do want all candidates to feel excited about the tools and environment they will engage with from day one.API language: KotlinEmbedded components: ...

Join Cardless as a Backend Software Engineer and become an integral part of our innovative team! In this role, you will design, develop, and enhance the robust systems that drive our co-branded credit card platform, covering key areas such as applications, accounts, transactions, fraud detection, risk management, and customer rewards.Your contributions will be essential in ensuring the scalability, security, and performance of our backend systems. You will engage in architectural planning and decisions to evolve our platform as we expand.

At Anara, we're seeking a skilled Backend Software Engineer to join our dynamic team in San Francisco. As a key contributor, you will develop the robust infrastructure that powers our AI-driven research tools. Your expertise will help us handle the challenges of processing millions of files and scaling our services for hundreds of thousands of users.Key Responsibilities:Design and implement scalable backend systems for AI-enhanced research applications.Work collaboratively with the engineering team to optimize our retrieval pipeline, focusing on improving response quality, speed, and reliability.Establish and promote best practices for model deployment and prompt engineering.Analyze and enhance system performance while balancing cost efficiency to ensure rapid growth.Lead the design and automation of evaluation pipelines to continuously assess and improve the reliability of our AI agents.

Join demo.levels.fyi, a trailblazing software company that empowers real-time collaboration on vital workflows. Established in 2012, we proudly serve over 10,000 clients globally and are backed by esteemed investors, including Example Capital. Having successfully raised our Series C, demo.levels.fyi is currently valued at $750 million.As a Backend Engineer, you will be an integral part of our dynamic team, directly reporting to the team manager. This pivotal role will enable you to influence various workflows and contribute to our innovative projects.

About HappyRobotHappyRobot is revolutionizing the real economy with our AI-native operating system designed to bridge the gap between intelligence and action. By integrating real-time insights with specialized AI capabilities, we empower enterprises to manage complex operations autonomously.Our AI OS continuously accumulates knowledge, optimizes various processes, and adapts over time. We are initially focusing on supply chain and large-scale industrial operations, where speed, resilience, and ongoing improvement are paramount—allowing human resources to concentrate on strategic and creative high-value tasks.Discover more about our vision in our Manifesto. So far, HappyRobot has successfully raised $62M in funding, including a recent $44M in Series B financing as of September 2025. Our esteemed investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10, who share our mission to transform enterprise operations. We are leveraging this investment to build a top-tier team of individuals with unwavering motivation, exceptional problem-solving capabilities, and a drive to exceed limits in a dynamic working environment. If this resonates with you, we want you at HappyRobot.About The RoleAt HappyRobot, our Senior Backend Software Engineers are entrusted with significant components of our product and infrastructure, overseeing projects from inception to deployment. We are seeking passionate builders who thrive in uncertain environments, value craftsmanship, and desire genuine ownership of their creations.

Join our dynamic team at unify as a Senior Backend Software Engineer, where you will leverage your expertise to design and implement robust backend systems that enhance our product's performance and scalability. You will collaborate closely with cross-functional teams to develop innovative solutions that meet our customers' needs.

About Levelpath:Established in 2022 and supported by leading venture capital firms in Silicon Valley, Levelpath aims to transform the procurement software landscape, making it delightful for all businesses, regardless of size. Our innovative platform streamlines the procurement process, enhancing speed, safety, and transparency across the organization.Leveraging AI technology, we empower users, boost productivity, and simplify workflows, unlocking extraordinary procurement opportunities.At Levelpath, we champion growth that occurs outside of comfort zones, and we believe in reaching our full potential when faced with challenges. Our work environment thrives on problem-solving and accountability, where every team member is an owner.Engineering at Levelpath:We are on the lookout for dedicated backend developers to join our team and contribute to our customer-facing applications. Success in this role requires significant experience with Ruby and Ruby on Rails, familiarity with service-oriented architectures, GraphQL, REST, and collaboration with front-end teams utilizing React/TypeScript.This role is office-based in downtown San Francisco, providing the opportunity to lead a team in an agile environment with swift decision-making processes. As a founding member, you will play a key role in building a generational company.Responsibilities:Take ownership of a significant portion of the platform development within your initial months, maintaining a strong focus on user experience.Utilize your backend and distributed systems knowledge to scale our Rails-based platform while continuously improving code quality, tools, and processes.Collaborate closely with local and global team members based in San Francisco.Recognize customer challenges and innovate solutions through daily prototyping, refining, and delivering.

About SemgrepSemgrep stands at the forefront of code security, enabling developers to innovate seamlessly. Our platform empowers teams to identify, flag, and address real vulnerabilities before deployment, with security solutions that evolve alongside their coding efforts. By securing code during its creation, Semgrep provides essential guardrails, allowing developers to work swiftly while ensuring their safety. With a focus on integration, Semgrep offers visibility, control, and confidence to security teams, making it an indispensable tool for modern developers. Our AI-driven approach minimizes false positives and highlights actionable vulnerabilities, with validation from 95% of security experts across over 6 million findings. In our mission to eliminate false positives, our AppSec teams experience an 80% reduction in false positives across Code and Supply Chain, significantly alleviating backlog issues.Founded in San Francisco and supported by prestigious investors such as Menlo Ventures, Felicis Ventures, Lightspeed Venture Partners, Redpoint Ventures, and Sequoia Capital, Semgrep is recognized by Gartner in Application Security Testing and trusted by leading companies including Snowflake, Dropbox, and Figma. Discover more about us at semgrep.dev.About the RoleAs a Senior Backend Engineer, you will be instrumental in enhancing our backend and infrastructure systems to ensure a robust and efficient user experience for all our customers. You will collaborate with fellow engineers to design and develop APIs, data models, and services that power Semgrep’s scalable products. A solid understanding of databases, query optimization, and distributed systems is essential, as is the ability to integrate third-party services into existing first-party code.Our technology stack includes Typescript and React on the Frontend and Python, Flask, and SQLAlchemy on the Backend, deployed using Kubernetes and hosted on AWS. While professional experience with these technologies is preferred, we welcome candidates who are eager to learn them quickly!This position is hybrid, requiring at least 3 days a week in our San Francisco, New York, Boston, or Denver offices, depending on your team. We also consider remote work for exceptional candidates.CompensationThe estimated starting annual salary for this role ranges from $160,000 to $207,000 USD. The actual salary will be determined based on various factors, including job-related skills, relevant experience, qualifications, location, internal equity, and market data. In addition to the base salary, total compensation may include equity, variable compensation, and benefits.

At Scribd, Inc., we are dedicated to enhancing human understanding through our suite of innovative products, including Scribd®, Slideshare®, Everand™, and Fable. Our mission revolves around transforming access into deeper insights and expertise for billions globally.Our CultureWe foster a culture where authenticity and boldness are encouraged; where constructive debates lead to commitment, and where every team member is empowered to prioritize customer needs.We believe that exceptional work emerges from harmonizing individual flexibility with a strong sense of community. Our Scribd Flex program allows employees to select their preferred work style and location, while also emphasizing the importance of intentional in-person interactions to enhance collaboration and culture. All employees are expected to participate in occasional in-person meetings, regardless of their location.We look for team members who embody “GRIT”—the intersection of passion and perseverance towards long-term goals. GRIT serves as a framework for our operations: setting and achieving Goals, delivering impactful Results, contributing Innovative ideas, and building a strong Team through collaboration.Join us at Scribd (pronounced “scribbed”) as we ignite human curiosity and create a world filled with stories and knowledge, democratizing the exchange of ideas and empowering collective expertise.The TeamOur ML Data Engineering team is responsible for powering metadata extraction, enrichment, and content understanding across our platforms.

About UsAt Squint, we are passionate about creating technology that has a real-world impact. While many tech companies target digital-first sectors, our mission is to empower the 80% of the global workforce who are the backbone of everyday industries: frontline manufacturing operators. From producing soda cans to crafting tires, toothpaste, and chocolate bars, these individuals manufacture the products we interact with daily. Our innovative platform revolutionizes manufacturing operations by putting AI and AR tools directly in the hands of workers, fostering what we term 'agentic manufacturing'—enabling every team member to make informed decisions in real-time utilizing practical artificial intelligence.Proven Impact with Industry LeadersWe proudly serve Fortune 500 companies across the Automotive, Consumer Packaged Goods, and Life Sciences sectors. These industry leaders rely on Squint to harness and activate their critical operational expertise, leading to significant benefits such as reduced downtime, decreased waste, and enhanced productivity on a large scale.Backed and Built by the BestHaving raised a $40 million Series B at a $265 million valuation, we are supported by prominent investors including Sequoia Capital, Menlo Ventures, TCV, and The Westly Group. Our co-founders have been featured on Forbes' 30 Under 30 list for Manufacturing and Industry, and Fast Company recognized us as one of the most innovative augmented and virtual reality companies of 2025.About the JobWe are seeking passionate builders who thrive in fast-paced environments and take ownership of their work. If you are eager to make a substantial impact while engaging with the full technology stack, this engineering position is perfect for you.What Makes This Role UniqueYou have the potential to define your impact in this role.You will lead projects from conception to completion: gathering business insights, setting strategic direction, incorporating customer feedback, iterating swiftly, and acquiring the skills necessary to succeed.Expect to operate at the pace of a startup, with significant ownership, learning opportunities, and career advancement.Your ResponsibilitiesRapidly deliver features...

About UsAdapt API is an innovative, venture-backed startup dedicated to revolutionizing the agentic operations layer within the Property & Casualty (P&C) insurance sector. We aim to modernize an industry that, all too often, resembles a time capsule filled with filing cabinets, fax machines, and mountains of paperwork.Despite some digital advancements, the insurance sector remains bogged down by cumbersome manual processes. With various systems that struggle to communicate, agents frequently find themselves engaged in repetitive and error-prone tasks, such as copying and pasting information across disparate platforms. Our mission at Adapt is to streamline these workflows, creating a cohesive and efficient agentic platform that enhances productivity and accuracy.While our implementation strategies may evolve, our commitment to this vision remains steadfast. Join us as we transform the future of insurance operations. Why Join Adapt?Be part of a foundational team in a rapidly scaling startup that has achieved Product-Market Fit (PMF) in a vast and underserved industry.Engage with challenging backend and automation engineering projects from day one; backend development is our primary focus.Enjoy compensation that exceeds market standards, including competitive cash and equity options.Benefit from our strong backing by top investors, including notable fintech funds and industry veterans. What We Are Looking ForWe seek highly motivated, autonomous engineers who are passionate about designing and implementing comprehensive workflows within a complex, high-stakes industry. You will play an essential role in shaping our company as we grow. Key ResponsibilitiesCollaborate closely with team members and early adopters to develop a top-tier agentic platform.Tackle complex technical challenges from the ground up, overseeing solutions through the entire development lifecycle.Help define our technology stack and architecture for a dynamic product; we prioritize using the right tools for each task.Contribute to fostering a strong team culture and improving internal tools and processes.

Join Saris AI as a Staff Backend Software Engineer, where you will play a pivotal role in developing innovative solutions that harness the power of artificial intelligence. In this dynamic position, you will collaborate with cross-functional teams, design scalable systems, and contribute to the overall architecture of our backend solutions.