Founding Engineer - AI Agents (Voice + Infrastructure)

I’m working with a YC-backed startup building the testing and observability layer for AI agents.They’re tackling a problem most teams ignore until it breaks: how do you actually trust AI systems in production?They’ve already:Raised ~$4M from top-tier investorsLanded enterprise customers (including Fortune 500s)Reached meaningful ARR within weeks of launchContinued to scale rapidly sinceThis is not a “build a wrapper” role.It’s core infrastructure for a category that’s about to explode.The RoleThis is a Founding Engineer position in a small, high-calibre team in San Francisco.You’ll work across:Product: building features end-to-endAI Systems: LLMs, agents, voice pipelinesInfrastructure: real-time systems, scaling thousands of interactionsYou’ll be shipping quickly, working directly with users, and owning meaningful parts of the product from day one.What They’re Looking For1-3 years experience (flexible if you’ve built exceptional things)Strong engineering fundamentals (Python and/or React/TypeScript)Evidence of building and shipping real productsComfortable moving fast without heavy structureInterested in startups and high-ownership environmentsNice to have:AI / LLM / agent experienceVoice or real-time systems exposureStrong product or design instinctWhy This Is A Good BetReal traction and real customersTechnical founders (ex-AWS Bedrock / Microsoft Copilot)High ownership from day oneExposure across AI, infrastructure, and productThe kind of environment where you compress years of learning into monthsDetailsSan Francisco (in-person)Small team, high bar, fast paceIf you’re early in your career and want to work on hard problems, ship quickly, and accelerate your trajectory, this is worth a conversation.Message me if you’re open to hearing more.