Senior Full Stack Engineer - San Francisco

Join our dynamic team as a Senior Software Engineer, where you will play a pivotal role in shaping the future of our innovative platform at fuku. Located in the vibrant city of San Francisco, this hybrid position offers the flexibility of working three days in the office, with options for candidates based in New York City as needed. At fuku, we are a fast-growing startup focused on empowering creators in the technology space. Our platform allows creators to seamlessly build websites and enhance their online presence. We are dedicated to helping creators connect with audiences, grow their businesses, and thrive in the expansive $200 billion creator economy. As a Senior Software Engineer, you will take charge of significant product features, guiding them from concept through implementation and scaling. You will be pivotal in balancing frontend development with React and TypeScript, alongside backend tasks utilizing Python, collaborating with a dedicated team to deliver exceptional user experiences to millions.

Join NovaTech Solutions as a Senior Full-Stack Engineer and play a crucial role in scaling our flagship platform while pioneering innovative customer-facing products. In this dynamic position, you will collaborate closely with product and design teams to define feature roadmaps and architect robust services. Your expertise will guide junior engineers, enhancing their technical growth and best practices adoption.Key Responsibilities:- Collaborate with product and design teams to establish feature roadmaps and develop resilient services.- Mentor junior engineers, providing guidance on best practices and fostering their professional development.- Create modern user interfaces with React and build scalable backend APIs using Node.js.- Maintain reliable data layers with PostgreSQL to ensure data integrity and performance.- Take ownership of product features from conception through deployment and maintenance.- Continuously enhance code quality through thorough reviews and refactoring.- Lead discussions across teams focusing on performance, security, and delivery.- Convert product requirements into maintainable and scalable solutions.- Design engaging user experiences that impress our customers.- Ensure efficient deployment pipelines and work with DevOps to monitor platform health.- Automate repetitive tasks and maintain detailed documentation for team alignment.

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.

Join fuku as a Senior Software Engineer, where you'll take charge of mission-critical systems from inception to deployment. Located in the vibrant tech hub of San Francisco, CA, this full-time role requires in-office presence five days a week. As part of a dynamic team, you'll architect and deliver full-stack product features utilizing advanced technologies such as React, TypeScript, Node.js, and Postgres. Your work will directly impact the automation of compliance workflows for innovative startups, and you will collaborate closely with founders to drive key technical decisions.

Join fuku as a Senior Product Designer and play a pivotal role in revolutionizing compliance processes through automation. At fuku, we are an innovative AI-native platform committed to transforming tedious manual workflows into efficient automated systems. As the fastest-growing compliance company in the industry, we empower hundreds of organizations to streamline their operations and enhance security.Our recent funding of $32 million in Series A financing, supported by prestigious investors such as Insight Partners, General Catalyst, and Y Combinator, propels our mission forward. Our team is composed of exceptional talent, including former founders, Olympiad medalists, and engineers from elite institutions like OpenAI, Stanford, MIT, and Berkeley. Together, we aim to eliminate unnecessary busywork for humanity, with a strong focus on compliance.

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.

ABOUT SPHERESphere is revolutionizing trade compliance with cutting-edge AI technology. Our innovative system, TRAM, autonomously analyzes and interprets global trade laws, ensuring reliable compliance determinations across various jurisdictions. We manage the full compliance lifecycle—from calculation and registration to filing and remittance—with millisecond latency and zero downtime.At Sphere, we are proud to be backed by prominent investors such as a16z and Y Combinator, and we've achieved over 30% month-over-month growth. Our impressive client roster includes emerging leaders like ElevenLabs, Replit, Deel, and Runway. We operate with a small, dedicated team in our San Francisco headquarters, where every member has ownership over significant domains of our platform.THE ROLEWe are seeking experienced Senior Full Stack Engineers to spearhead the development of new product lines, including input tax, withholding tax, e-invoicing, and tariffs. Your contributions will be pivotal in scaling our operations and directly influencing our annual recurring revenue (ARR).WHAT YOU'LL DOWithin weeks:Deliver critical features that clients rely on daily, such as filing infrastructure.Take ownership of a feature and drive measurable outcomes.Collaborate with customers like Eleven Labs, Lovable, and Deel to enhance key components of our platform, aiming to improve filing generation and submission speeds.Within months:Lead the end-to-end development of new product lines, furthering our AI-driven compliance platform.Mentor junior engineers and foster a collaborative team environment.

Join fuku as a Senior/Staff Engineer, where you will play a pivotal role in shaping the future of global payments infrastructure. This position is based in either San Francisco, CA, or New York, NY. At fuku, we are committed to revolutionizing the way payments are processed, currently facilitating $1.5 billion annually to over one million payees. Our focus is on developing high-scale, reliable backend systems that ensure seamless transactions for gig workers and businesses alike.Our company culture promotes:- Autonomy and ownership in your work- Fast-paced, iterative product development- Collaboration with a team of highly skilled engineers- Designing systems capable of handling extensive financial data reliablyAs a Senior/Staff Engineer, you will be responsible for designing, building, and scaling production-ready backend systems capable of processing large volumes of data. You will work across the entire stack, partner with product and engineering leadership, and make significant technical decisions.This role is ideal for engineers who:- Excel in high-impact, ambiguous environments- Enjoy constructing end-to-end systems with tangible results- Are passionate about developing scalable FinTech infrastructure- Thrive in an environment that encourages rapid iterations and robust system development.Your tech stack will include:- Frontend: React- Backend: Python- Infrastructure: AWS, ECS- Tools: GitHub, Linear, Slack, NotionResponsibilities:- Design and implement scalable backend systems for high-throughput payments- Launch and refine applications and large-scale software projects- Collaborate with product and engineering teams to drive impactful results- Work with substantial datasets and distributed systems- Optionally engage in recruiting activities, including sourcing and interviewing engineering talent.

Join Binti as a Senior Full Stack Software Engineer and play a crucial role in developing innovative software solutions that enhance our mission to streamline the adoption process. You will be responsible for designing, developing, and maintaining our web applications, ensuring optimal performance and user experience.In this position, you will collaborate with cross-functional teams, participate in all phases of the software development lifecycle, and mentor junior developers. If you are passionate about building scalable applications and are eager to solve complex problems, we want to hear from you!

About UsScribe is a dynamic workplace where talented individuals achieve their career best. Our Workflow AI platform is trusted by over 94% of the Fortune 500, enabling teams to enhance their workflows and boost efficiency. Since our inception in 2019, we've expanded to over 5 million users across 600,000 businesses. Based in San Francisco, we've earned recognition as a LinkedIn Top Startup and are valued at over $1 billion, supported by prominent investors. Join us in revolutionizing the way work is done.Our Work CultureAt Scribe, we are passionate builders dedicated to mastering our crafts while supporting each other in achieving shared success. Our core values include:Accelerating impactRaising the barEmpowering our usersPracticing kindness through clarityEmbracing rapid learningFostering teamworkRole OverviewWe are seeking an experienced Senior Full Stack Engineer who thrives on developing application code and scalable distributed systems. Your expertise will contribute to designing extensive data ingestion and processing systems, integrated with our custom AI models.

ABOUT MITHRLWe envision a future where new medicines are accessible to patients within months rather than years, and where scientific innovations occur at lightning speed.Mithrl is pioneering the first commercially available AI Co-Scientist, a revolutionary discovery engine that transforms complex biological data into actionable insights in mere minutes. By utilizing natural language queries, scientists can receive real analysis, innovative targets, hypotheses, and patent-ready reports instantly.Our impressive growth trajectory:12X year-over-year revenue expansionTrusted by top-tier biotechs and major pharmaceutical companies across three continentsFacilitating tangible breakthroughs from target discovery to real patient outcomes.ABOUT THE ROLEWe are seeking a Senior Full Stack Engineer to architect, scale, and enhance the core Mithrl product. This pivotal role demands a product-centric mindset, granting you substantial ownership across frontend, backend, and system architecture. You will collaborate with product, design, machine learning, and scientific teams to translate intricate scientific workflows into user-friendly, high-performance software utilized by leading researchers daily.As a senior engineer, your responsibilities will extend beyond just execution; you will also shape technical direction, architectural choices, and establish engineering standards. You will oversee features from initial concept through to production, iteration, and scaling. This position requires robust full-stack engineering principles, a passion for shipping products, and the ability to thrive in dynamic, fast-paced environments.If you have a passion for creating impactful products for sophisticated users, delving deep into system design and user experience, and taking ownership of essential components in a rapidly expanding platform, this opportunity is perfect for you.

About StradaStrada is at the forefront of revolutionizing the insurance industry by creating an AI-driven operating layer. Our innovative platform utilizes advanced AI agents to streamline communication across calls, texts, emails, and chat, effectively managing essential front-office tasks from policy servicing to claims intake.With a dedicated focus on the insurance sector, Strada provides unparalleled domain expertise and a product depth that generic AI solutions simply cannot offer. Supported by Y Combinator and elite investors, we currently facilitate over 1 million customer interactions for leading insurers, MGAs, and brokers, representing more than $10 billion in annual premiums. Our rapid adoption across the industry underscores the demand for our transformative solutions.The insurance sector, one of the largest and most intricate global industries, stands on the brink of a significant transformation. Strada is set to replace outdated workflows with AI-native infrastructure that operates efficiently at scale, bridging the gap between AI, infrastructure, and the stringent regulations governing real-world systems.As a compact, high-ownership team located in San Francisco, we are already integrated into production systems at sophisticated insurance organizations. If you're eager to innovate, tackle complex challenges, and influence the future of a major industry, we would love to connect.Why Insurance?The insurance industry is a vital component of the global economy, aiding businesses in maintaining operations, helping families recover from unexpected events, and enabling entire industries to manage risk. However, its operational methods have remained largely unchanged for decades, with many frontline processes still relying on traditional phone calls and legacy systems.At Strada, we are developing AI solutions that seamlessly integrate into these processes, making them significantly faster, smarter, and more efficient. This represents a market exceeding $300 billion, ripe for innovation.The OpportunityWe are seeking a Senior Full Stack Engineer to join our team in San Francisco. In this role, you will be at the cutting edge of voice AI technology, responsible for developing, evaluating, and deploying advanced LLM and voice systems that redefine conversational AI.As a senior full stack engineer, you will take ownership of significant projects and collaborate closely with clients to create products that exceed their expectations. This role is pivotal for someone passionate about shaping both our product offerings and engineering culture as we expand.

Agency Notice: We are not currently collaborating with recruiting agencies for this position. Please refrain from contacting Vizcom employees regarding this role. Any resumes submitted without a prior agreement will be deemed unsolicited.Why Join Vizcom?Vizcom is an innovative AI-driven design platform utilized by industry leaders such as GM, Nike, and Ford, among over 200 other esteemed companies, to transform sketches into stunning photorealistic renders, 3D models, and engaging videos. Our belief is that AI should enhance human creativity rather than replace it. By adopting a sketch-first methodology, we empower designers to maintain control while significantly speeding up the iteration process from 5 ideas to 500 in a single session. Our team of around 50 is rapidly expanding, delivering multiple updates daily, and developing the tool that is setting the benchmark for professional industrial design.Your RoleIn this role, you will engage with the entirety of Vizcom's technology stack, from TypeScript-based design tools to Postgres data models and AI inference pipelines, to deliver fully integrated features that designers rely on daily. While our frontend and backend specialists dive deep into their focuses, your expertise spans wide: you will be the engineer capable of tracing a bug from a React component through a GraphQL query to a Postgres function, resolving it, and deploying the fix before lunch.This position is perfect for individuals who thrive on variety and ownership. In any given week, you may create a new canvas interaction in React Flow, refine a PostGraphile query, implement a BullMQ job for a new AI workflow, and review a fellow team member's migration. Your contributions will make the philosophy of enhancing human creativity with AI a reality across our entire product.Compensation$195K – $225K + Offers EquityKey ResponsibilitiesDeliver complete features: Take ownership of features from React component to Postgres schema — with no handoffs or delays.Enhance product UI: Create fast and precise interactions in React, TypeScript, and React Flow.Develop APIs and data models: Execute Postgres migrations, PostGraphile mutations, and RLS policies for multi-tenant isolation.Integrate AI workflows: Seamlessly connect frontend experiences to GPU inference pipelines through BullMQ and external AI services.Optimize the tech stack: Profile and enhance performance across the board — from React renders to GraphQL resolutions and query plans.Collaborate extensively: Partner with frontend specialists, graphics engineers, designers, and product teams to deliver cohesive user experiences.Enhance reliability: Implement monitoring for features to ensure robust performance.

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.