Senior Full Stack Engineer - San Francisco

At fal, we are revolutionizing the infrastructure for AI inference with our cutting-edge Serverless platform. Currently supporting over 1,300 endpoints on the fal Marketplace, our system processes tens of millions of requests daily across various production workloads. Enterprises leverage fal Serverless to effortlessly deploy, operate, and scale their custom AI models without the burden of managing infrastructure. Our platform takes care of autoscaling, observability, and operational complexities, providing a smooth user experience through our intuitive UI. Launched in early 2025, our Serverless infrastructure, initially developed to meet fal's internal scaling needs, has quickly evolved into a core revenue-generating product with exponential growth in adoption. As one of the fastest-growing AI startups, fal has achieved a Series D funding round with a remarkable valuation of $4.5 billion, all while maintaining a lean and agile team of approximately 70 employees. Joining us now means gaining significant ownership and making a direct impact on a foundational product.

At fal, we are revolutionizing generative-media infrastructure, empowering users to transform raw creativity into polished experiences within minutes. As we experience rapid growth, we are seeking a Growth Engineer who can seamlessly merge agile engineering skills with a product-oriented growth mindset—someone capable of delivering code in the morning and forging partnerships over coffee in the afternoon. Why This Role is Crucial This position places you at the crossroads of engineering, product development, and go-to-market strategies. Your innovative prototypes, experiments, and engaging content will serve as the initial interaction for creators, studios, and Fortune 500 innovation teams. A successful execution of your role will be reflected in the company's performance metrics and dashboards. Your Responsibilities Quickly develop lightweight client libraries, demo applications, or event microsites. Conduct data-driven experiments by segmenting cohorts, designing A/B tests, and automating reporting. We maintain a clear, metric-focused view of acquisition costs and activation rates for every segment. Create compelling blog posts, tweets, and teardown threads devoid of “AI slop.” Your content will consistently attract qualified sign-ups and ignite industry discussions. Manage customer interactions: Engage with prospects, troubleshoot their initial calls, and represent fal at meetups and hackathons, leaving prospects impressed with your understanding and speed of execution. Identify high-impact challenges, implement time-boxed solutions, and deliver results. After onboarding, you will propose your own roadmap, and we are inclined to support your initiatives. You May Be a Great Fit If You... Can code at lightning speed. You are fluent in Python and JavaScript (Next.js, React) and can integrate APIs, CLIs, and scrapers before lunch. Thrive on metrics. You utilize SQL, Amplitude/Looker, or plain-text CSVs to derive insights swiftly. Possess persuasive writing skills. Your copy is engaging, helpful, and opinionated, driving clicks. Enjoy interacting with people as much as coding. You are energized by demos, direct messages, and in-person events. Seek ownership. You find excitement in tackling ambiguous problems and starting from a blank slate. Are passionate about generative media. You keep up with the latest diffusion papers for fun and have strong opinions on video model architectures. Preferred Qualifications Prior experience in product-led growth (PLG) or developer-tool startups. Familiarity with growth analytics stacks.

fal is at the forefront of developing the most rapid and scalable infrastructure for AI inference. Our fal Serverless platform powers over 1,300 endpoints on the fal Marketplace, efficiently managing tens of millions of requests daily across various production workloads. Enterprises leverage fal Serverless to seamlessly deploy, operate, and scale custom AI models without the burden of infrastructure management. Our platform excels in autoscaling, observability, and operational efficiency, all handled through fal’s intuitive UI. Initially designed as internal infrastructure to support fal’s own scale, Serverless was publicly launched for enterprise clients in early 2025 and has since evolved into a core revenue-generating product experiencing rapid adoption. As one of the fastest-growing AI startups, fal has reached Series D funding with a valuation of $4.5 billion, all while maintaining a lean team of approximately 70 employees. Joining us means becoming an early member of a dynamic team where your contributions directly influence a foundational product.

Join fal as an experienced Enterprise Product Manager, where you will spearhead our enterprise product initiatives. Collaborate closely with large-scale clients to understand their unique needs, influence pricing strategies, and define essential features tailored for organizational use cases.

fal is seeking a Business Development Representative (BDR) based in San Francisco. This role centers on generating new business, building relationships with clients, and collaborating with both sales and marketing teams to help drive growth. Key responsibilities Find and pursue new business opportunities in the San Francisco area Develop and maintain strong connections with clients Partner with sales and marketing colleagues to achieve growth goals What fal values Drive to succeed in sales and business development Clear communication and the ability to build client rapport Interest in supporting fal's market expansion

About StackAIStackAI is a revolutionary no-code AI workflow platform that enables businesses to construct, implement, and expand AI-driven workflows without requiring extensive machine learning expertise. With a growing user base and increasing enterprise adoption, our goal is to democratize access to large language models (LLMs), empowering every business operator—beyond just developers. Supported by Y Combinator and top-tier investors, we are laying the groundwork for the AI-driven future of work.The RoleAs a Senior Full Stack Engineer, you will be instrumental in defining the product and technical architecture at StackAI. Your responsibilities will span the entire technology stack, from crafting scalable backend systems to creating stunning and user-friendly frontend interfaces, and incorporating advanced AI models into our platform. This role offers significant impact, as you will work closely with the founding team, take charge of essential product features, and shape the engineering culture of a rapidly evolving startup.We seek exceptional 10X engineers—innovative builders who can consistently deliver results in a dynamic environment, remain inquisitive, and excel in diverse roles.ResponsibilitiesIn this role, you will:Build and own the entire platform, from backend services and APIs to frontend interfaces.Create robust, scalable backend systems utilizing Python and FastAPI (or similar), with optimized databases (SQL/NoSQL).Design and maintain high-quality user interfaces using React, Next.js, TypeScript, and Tailwind CSS, ensuring polished, intuitive, and responsive user experiences.Integrate new AI models and features into our products for seamless performance and enhanced value.Manage StackAI’s landing and product pages to establish benchmarks for clarity, design, and quality.Collaborate across the stack to connect backend services with frontend applications seamlessly.Engage with design, product, and customers to refine product direction and prioritize user needs.Stay at the forefront of full-stack technologies, promoting best practices and innovative solutions.Assist with customer support as needed; every team member contributes to user satisfaction.

At fal, we are crafting the foundational infrastructure for the generative AI era. Our mission is to empower developers and enterprises to effortlessly create, deploy, and scale multimodal AI applications with unparalleled speed, simplicity, and reliability. By merging high-performance inference, orchestration, and observability into a single cohesive platform, fal enables organizations to introduce innovative AI products without the burden of managing complex infrastructures.With swift adoption across various industries and a market poised for explosive growth projected to reach hundreds of billions in the coming decade, fal stands uniquely positioned to play a pivotal role in the next wave of AI innovation.About The Rolefal is transforming the creative technology stack for the Generative Media age. We are on the lookout for a dynamic Commercial (Mid-Market) Account Executive to join our expanding team and assist clients in harnessing the power of AI for media generation, automation, and scalability.If you excel in high-energy environments, enjoy collaborative work, and are driven by the desire to help companies innovate through technology, this role presents an exhilarating chance to be part of the future of AI infrastructure.Technologies You'll UseSalesforce, Outreach, Gong, Clari, Apollo, fal Console.Your ResponsibilitiesIdentify and engage with target mid-market accounts to generate qualified opportunities and ensure consistent pipeline growth.Utilize marketing-generated leads alongside outbound strategies to create demand for fal’s Generative Media infrastructure.Collaborate with creative studios, AI innovation teams, and AI developers to uncover new adoption opportunities.Execute each sales cycle meticulously: conduct discovery sessions, lead product demonstrations, align with executives, and deliver business outcomes that enhance long-term customer value.Develop a robust understanding of fal's Generative Media platform, its technical framework, and its value across various industries.Implement strategic campaigns to promote customer adoption and expand usage within accounts during the initial 6–12 months post-sale.Accurately forecast and manage pipeline utilizing MEDDPICC and Command of the Message methodologies.Work cross-functionally with marketing, product, and engineering teams to gather insights and inform go-to-market strategies.Adapt and excel in a rapidly evolving market, continually learning and innovating to meet customer demands.What We’re Looking ForExperience in sales, particularly in a technology-focused environment, is preferred.

Join fal as a Software Engineer and play a crucial role in developing the next generation of usage-based billing systems. This is an exciting opportunity for individuals who are enthusiastic about designing scalable, event-driven systems that seamlessly integrate with Stripe and Orb, enabling real-time usage tracking and delivering precise, adaptable billing experiences for our clients. In this position, you will collaborate closely with cross-functional teams, including Product, Finance, and Infrastructure, to ensure our billing system is reliable, accurate, and capable of accommodating evolving pricing models as our product offerings expand.

We are seeking a talented Applied Machine Learning Engineer with a comprehensive understanding of the generative media landscape. You should possess an up-to-date knowledge of emerging methodologies and be capable of identifying gaps in the current market. Your role will involve innovating and developing machine learning models that enhance user experiences, requiring both novel training techniques and the fine-tuning of existing models with fresh datasets.

Join our dynamic team at gumloop as a Senior Full Stack Engineer, where you will play a pivotal role in shaping our technology landscape.Take ownership of end-to-end feature development: design, implement, test, deploy, and maintain your creations in production.Collaborate closely with users to swiftly transform feedback into actionable improvements, achieving results within hours, not days.Develop and manage scalable front-end and back-end solutions that maintain speed and reliability as user traffic increases.Contribute to the growth of the team by reviewing pull requests, providing context, and mentoring junior engineers.

At CreatorIQ, we are dedicated to revolutionizing creator-led growth, empowering over 1,300 global brands and agencies to thrive.Our mission is to humanize businesses while amplifying the impact of individuals. Guided by our core values—intentionality, excellence, collective journey, and humanity—we have been recognized as one of the best workplaces by various programs, including BuiltIn LA and NY. Our growth story includes being named one of the Fastest-Growing Companies in North America by Deloitte Technology Fast 500™ for four consecutive years, and being highlighted as a leader in IDC MarketScape: Worldwide Influencer Marketing Platforms for Large Enterprises in 2025, among others. Our flexible work model fosters collaboration and innovation, accommodating diverse working styles.Join us in our exciting journey. Become a vital part of our dynamic team and help transform the industry!Senior Full Stack Engineer, Creator RecruitWe are looking for a talented Senior Full Stack Engineer to enhance our Creator Tools team. Your contributions will significantly improve user experiences and help us develop scalable solutions for our expanding platform.The ideal candidate will possess a strong background in frontend frameworks, solid backend development skills, and a collaborative spirit suited for a fast-paced environment. You should be ready to take ownership of features, contribute to architectural decisions, and maintain high coding standards.The Creator Tools team is responsible for developing all user-facing features on our platform, directly impacting the lives and livelihoods of creators who utilize our tools to earn and sustain their businesses.From payment processing and social authentication to e-commerce solutions and campaign workflows, we enable the full creator experience. Every feature you develop and enhancement you implement is integral to delivering a seamless, intuitive platform that empowers creators to grow and earn with confidence.This role allows you to make an immediate and meaningful difference in the lives of creators who rely on our platform to pursue their passions.

Krew is revolutionizing the credit-servicing industry with the most advanced AI-driven credit-servicing agents. Backed by Long Journey Ventures and a roster of strategic angel investors, including notable figures like Ryan Hoover, Charlie Songhurst, and Michael Jones, we are a highly skilled team comprised of alumni from prestigious organizations such as Figure Robotics, Optiver, and the United Nations.Our omnichannel agents are already supporting over 100,000 consumers on their journey to financial wellness, and we aim to address more than $1 trillion in consumer delinquencies globally, adopting a compassionate and human-centric approach to financial health.Job Overview:We are in search of a talented Full Stack Engineer who is a key member of our technical team. You will thrive in a fast-paced environment and appreciate the value of high-quality code while collaborating with a forward-thinking team.Key Responsibilities:Develop and implement front-end interfaces using Next.jsCreate and maintain backend APIs and services that drive our AI agents and operational tools, primarily utilizing Python (FastAPI)Deliver user-facing features from concept to deployment, ensuring seamless integration across data models, APIs, and UIEnhance system reliability, observability, and performance throughout the tech stackCollaborate closely with design, operations, and compliance teams to ensure the delivery of secure and compliant featuresConduct testing, enforce high code quality standards, and engage in design and code review discussionsContribute to the evolution of our engineering standards and product development processesMinimum Qualifications:Minimum of 2 years of full-time professional experience in full-stack engineeringProficiency in backend development using Python or GoDemonstrated commitment to code quality through testing, code reviews, and documentationPreferred Qualifications:Experience in FinTech, Risk Management, or Compliance is advantageous but not required

About HappyRobotHappyRobot is pioneering the AI-native operating system for the real economy—an innovative platform that seamlessly integrates intelligence with actionable outcomes. By harnessing real-time insights, specialized AI agents, and a coordinating intelligence, we empower enterprises to manage intricate, mission-critical operations with genuine autonomy.Our AI OS continuously accumulates knowledge, optimizes processes at every level, and adapts over time. We're initially focusing on supply chain and large-scale industrial operations, where resilience, speed, and ongoing enhancement are paramount—liberating humans to concentrate on strategic thinking, creativity, and other high-value pursuits.Discover more about our vision in our Manifesto. HappyRobot has successfully secured $62M in funding to date, including a recent $44M Series B round in September 2025. Our esteemed investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10, who share our commitment to transforming enterprise operations. We are channeling this investment into assembling a world-class team—individuals with unwavering determination, exceptional problem-solving abilities, and a passion for pushing boundaries in a dynamic, high-pressure environment. If this resonates with you, we invite you to join us at HappyRobot.About The RoleAt HappyRobot, Full Stack Engineers take charge of significant components of the product and infrastructure from start to finish.We are seeking creators who thrive in uncertain environments, have a profound appreciation for their craft, and desire authentic ownership over their creations.

About Tacit Tacit is an early-stage deep tech startup based in San Francisco, focused on hardware that changes how people interact with computers. Backed by General Catalyst, Khosla Ventures, and Greylock Partners, the team brings experience from Stanford, BrainGate, Oculus, and Tesla. The company is committed to solving complex engineering problems to deliver new products that push the boundaries of human-computer interaction. Role Overview The Full-Stack Software Engineer will help turn ambitious ideas into real products, working across Tacit's software stack. This role involves taking features from initial concept through to deployment and shaping user experiences that support the company’s mission. What You Will Do Develop the internal product stack to improve workflows and prototypes across devices and companion clients. Build and expand internal applications for demos and data collection, supporting idea testing and user experience validation. Prototype new features for human-computer interaction, iterate with test users, and refine until the experience feels seamless. Design and run product experiments, including A/B tests and feedback loops, to quickly gather insights and guide product direction. Streamline data collection and participant experiences, including setup flows, session reliability, metadata capture, monitoring, and labeling. Develop demo features that showcase real-time sensing and inference in engaging, reliable ways. Find and implement integrations that improve team workflows and efficiency. Create and improve automated testing and release systems, such as CI/CD pipelines, smoke tests, and regression checks, to support frequent updates. Work closely with machine learning, hardware, and industrial design teams to define requirements, deliver results, troubleshoot, optimize, and ensure reliability. Qualifications Strong skills in Python (FastAPI, Pydantic; experience with pandas or numpy) and modern TypeScript/React. Experience building production backends (APIs, data models, reliability, observability) and delivering features for end users. History of shipping multiple products from start to finish.

Join Campfire as a Full Stack Engineer and play a pivotal role in transforming the accounting software industry. Based at our San Francisco headquarters, this in-office position invites you to collaborate closely with our talented team five days a week. About CampfireAt Campfire, we are driven by our mission to revolutionize accounting software, offering innovative solutions to startups and mid-sized tech companies. As proud graduates of Y Combinator's Summer 2023 cohort, we have secured support from esteemed investors like Foundation Capital and are witnessing rapid growth in our customer base.Your Role As a key member of our engineering team, you will be instrumental in designing and building our mission-critical software that enhances customer experiences. What We’re Looking ForWe seek an individual who: Possesses a strong foundation in Python, NextJS/React, and Tailwind.Thrives in a fast-paced, agile environment with minimal structure.Values autonomy, is self-motivated, and can effectively lead projects to completion. Ideal CandidateYou're driven not just by the prospect of a job, but by the desire to tackle challenges head-on. You're passionate about developing user-centric solutions and eager to collaborate, learn, and grow within a dynamic startup culture. How to ConnectIf you believe you’re the right fit, we want to hear from you! Share your journey with us and let’s discuss how you can contribute to igniting change at Campfire.‍ BenefitsWe offer exceptional benefits including 100% premium coverage for employees and 80% for dependents, along with comprehensive healthcare and dental options.

About the RoleJoin us as a Full Stack Engineer at nash, where you will be instrumental in crafting, enhancing, and scaling our innovative product offerings. Collaborate closely with our CTO, co-founder, and dedicated engineering and product teams to spearhead the development of new features across our technology stack, elevating both the user experience on the frontend and the robustness of our backend systems. This is a unique opportunity to be part of nash during a pivotal growth phase, as we create solutions for enterprises and small to medium businesses across the logistics value chain.Key ResponsibilitiesDesign, develop, and manage scalable web applications throughout the entire stack.Create and optimize responsive and high-performance user interfaces.Build and maintain backend services and APIs that fuel our platform.Collaborate with product, design, and engineering teams to quickly build, test, and iterate on features within our existing platform.Diagnose and resolve production issues across our systems, ensuring reliability and performance.Promote best practices in code quality, testing, and maintainability.Independently and collaboratively tackle complex technical challenges.QualificationsA minimum of 4 years of experience in building and deploying full-stack web applications.Proficient in React (or similar frontend frameworks) and Python.Experience with GraphQL, RESTful APIs, and database management (SQL and NoSQL).Strong grasp of modern frontend development principles, including TypeScript, React, component-driven architecture, and contemporary tooling.Familiarity with cloud platforms (AWS, GCP, or Azure) and best practices for deployment.A passion for delivering exceptional user experiences and developing scalable backend systems.Excellent problem-solving capabilities and the ability to work autonomously in a dynamic environment.Preference for candidates located in the Bay Area, as nash operates a hybrid-first product team with an office in San Francisco.Startup experience is a plus, but not mandatory.Bonus: Experience with Flask, SQLAlchemy, WebSockets, and integration-heavy systems.

Join our dynamic team at Plaud as a Full Stack Engineer, where you will play a crucial role in designing and developing innovative web applications. We are looking for a talented engineer who is passionate about technology and eager to solve complex problems in a collaborative environment.

At Siftstack, we are revolutionizing the development, testing, and operation of modern machines. Our innovative platform empowers engineers with real-time observability over high-frequency telemetry, effectively eliminating bottlenecks and facilitating faster, more dependable development.Founded by a team of experts from SpaceX, Google, and Palantir, Siftstack was inspired by our experience with pioneering projects like Dragon, Falcon, Starlink, and Starship. Our mission-critical infrastructure is designed for precision and scalability, meeting the highest demands of reliability in engineering.As an early-stage engineer at Siftstack, you will not only write code, but you will also play a pivotal role in defining our architecture, shaping our product, and cultivating a culture focused on addressing real engineering challenges. If you thrive on tackling complex technical problems and want to build foundational systems that support intricate machines, we'd love to hear from you.

Join us in revolutionizing the future of AI by shaping the narrative around document understanding.About the RoleWe are seeking an innovative Full-Stack Engineer dedicated to rapidly delivering AI products. If you thrive in a dynamic environment and are ready to take on diverse challenges, this role is for you. You will be responsible for developing our SaaS platform using Next.js and Python, contributing to open-source frameworks, and collaborating closely with customers to transform visionary ideas into tangible solutions. If you have experience launching AI applications that engage real users and can swiftly transition from concept to execution, we would love to connect.ResponsibilitiesLead front-end and full-stack development for our managed applications and SaaS offerings.Front-end technologies: Next.js, shadcn, react-query, etc.Back-end technologies: Python, Node.js, Kubernetes, Docker, Terraform, cloud services, databases, etc.Develop and maintain features for our open-source frameworks using Python and TypeScript.Collaborate with clients to create proof-of-concept and production-ready solutions.QualificationsMinimum 2 years of experience in full-stack development.Proven track record of launching web applications or new product features from the ground up, successfully moving from prototype to production.Experience in deploying AI/LLM-native applications, encompassing both user experience and core algorithm development.Rapidly iterate on solutions based on customer feedback, driving feature development and engaging in proactive user discovery.Experience in cross-functional teamwork, exemplifying the ability to take on product management responsibilities to scope and design features effectively.Demonstrated ability to scale applications to millions of users.Preferred: Background in machine learning and natural language processing.LocationWe foster a hybrid-friendly culture with our primary operations based in downtown San Francisco.Why Join Us?Meaningful Impact: Contribute to cutting-edge AI products that transform knowledge accessibility.Supportive Environment: Collaborate with a team of dedicated professionals who are passionate about innovation.