About the Role Join an early-stage AI infrastructure startup as its first engineer. You will work directly with the founder to evolve a functioning product into scalable infrastructure for AI-powered service businesses, with broad ownership across the product and its technical direction. What You'll Do • Develop the architecture and infrastructure needed to scale the product to a large user base. • Build and operate the agent runtime, including orchestration, memory, verification, and supporting systems. • Take projects end to end across backend, infrastructure, frontend, and AI agents. • Set technical standards and guide how the engineering team builds as it grows. • Ship improvements regularly to users operating real businesses. What We're Looking For • At least 2 years of experience shipping production software, or an equivalent record as a founder, solo builder, or exceptional early-career engineer. • Experience building and running LLM or AI agent systems in production, with real users relying on them. • Full-stack range, including the ability to work across backend, infrastructure, and user interfaces. • Experience turning prototypes into dependable systems through sound architecture, data models, runtime design, and orchestration. • Evidence of owning technical decisions and delivering quickly in an early-stage or independent environment. • Strong generalist engineering skills and practical experience with agent workflows, memory, evaluations, or verification are valuable. • Based in Europe and willing to relocate to San Francisco within the first year. Compensation & Benefits Base salary is €80,000 to €140,000 annually. Visa sponsorship and relocation support are available for a move to San Francisco. Location Remote within Europe, with relocation to San Francisco expected within the first year.