Founding Software Engineer

Founding Software Engineer | AI Agents | San Francisco or LondonLocation: San Francisco, CA or London, UK (London-based candidates must be willing to relocate to San Francisco in 2026)This is a genuine Founding Engineer opportunity to join an Andreessen Horowitz-backed AI startup as Engineer #2/3.Already trusted by Fortune 500 customers including a trillion-dollar enterprise you'll help build enterprise-grade AI agents that solve one of the most challenging problems in business automation: transforming highly unstructured data into fully auditable outputs using cutting-edge LLMs and agentic AI.This isn't another AI startup building chatbots. It's an opportunity to own products end-to-end, influence technical direction, and help shape the future of a rapidly growing company from the earliest stages.You'll enjoy this role if you:Love building products from the ground up.Thrive in fast-moving startup environments.Want genuine ownership rather than simply delivering tickets.Enjoy solving complex engineering problems with modern AI technologies.Want direct exposure to founders, customers and product strategy.Aspire to build or lead a company one day.We're looking for engineers who have:4+ years' commercial software engineering experience (flexible for exceptional candidates).Built and shipped AI-driven or agentic products into production.Strong TypeScript experience.Commercial AWS experience.Full-stack product ownership.Enterprise SaaS or B2B product experience.A passion for building in early-stage startups.LocationWe're keen to hear from engineers who are:Already based in San Francisco or the wider Bay Area.Based in London and excited by the opportunity to relocate to San Francisco in 2026.Package$Competitve base salary0.81.2% equityGenuine Founding Engineer positionOpportunity to shape engineering culture and technical directionWork directly alongside experienced founders solving real enterprise AI challengesIf you're looking for a role where you'll have genuine ownership, meaningful equity and the opportunity to build category-defining AI products, I'd love to have a confidential conversation.TPBN1_UKTJ