Founding Full Stack Engineer

The RoleRaydar is recruiting for this role on behalf of our client. Join a very small engineering group as an early hire, working across the front end, back end and infrastructure of a customer-facing software product. You will ship features, diagnose production issues and help set technical standards for future engineers. Expect broad ownership with little prescribed structure.What You'll DoBuild and ship features across the full stack, from user interface to backend services.Develop and refine systems built on large language models, including conversation flow, tool use and voice.Prototype adaptive interface components and turn ideas into working demos quickly.Build and maintain an evaluation pipeline that measures output quality and catches regressions.Investigate production issues by reviewing logs, tracing root causes, rolling back changes and adding tests.Design infrastructure for versioning and safe previewing of changes before release.Create low-latency, reliable infrastructure so users get instant responses.Take on whatever work is needed, including UI fixes, data migration scripts and customer issue debugging.Help establish engineering culture and practices as the team grows.What We're Looking ForPrior full stack engineering work at a growing software startup that has paying users.A track record of designing polished interfaces and shipping product features that users directly interact with.Working proficiency in React and Python.Hands-on delivery of AI-powered features in production, such as LLM-driven assistants, retrieval pipelines or orchestration layers.A bachelor's degree in computer science.Comfort with ambiguity and a strong sense of ownership.Good product instincts and enthusiasm for turning user feedback into code.Sound judgment about when work is ready to ship, and the ability to move quickly without creating hidden problems.Experience running systems that real users depend on, and an understanding of how they fail.Interest in closing the gap between a demo and a reliable production system through evaluation and iteration.Bonus PointsExperience at a sales technology startup.Location And Work ModelSan Francisco, CA, United StatesOn-site, 5 days per week in officeFull-timeCompensation, As The Posting Describes ItEquity