About the Role Join an early-stage AI company as its first engineering hire, working closely with the founder to turn a working AI-powered service business product into scalable infrastructure. You will shape the architecture and technical foundations for AI agents supporting real-world business operations, with the opportunity to grow into a CTO role as the company develops. What You'll Do • Rebuild and scale the existing product into infrastructure designed to support substantial user growth. • Design and operate the agent runtime, including orchestration, memory, verification, and reliability systems. • Build across backend, infrastructure, frontend, and AI agents, taking projects from design through production. • Set technical architecture, engineering standards, and development practices as the first engineer. • Ship product improvements regularly to customers running 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. • Full-stack range across backend, infrastructure, and user-facing product development, with the ability to make technical decisions independently. • Hands-on experience building and operating LLM or AI agent systems used by real customers, not just prototypes or demos. • Experience taking a working product or prototype to reliable production infrastructure, including architecture, data models, runtime, or orchestration. • Strong generalist engineering skills and the ability to explain the technical challenges behind systems you have built. • Experience with agent orchestration, memory, evaluations, verification, or multi-agent workflows is valuable. Background in service businesses such as recruiting or agencies is also useful. Compensation & Benefits Base salary is $150,000 to $250,000 annually, plus meaningful founding equity. Visa sponsorship and relocation support are available. Location On-site in San Francisco, California. The team works together in person.