Full Stack Engineer

About the Role

This is a full-stack engineering role with a backend lean at an early-stage AI infrastructure company building the continuous improvement layer for production AI agents. You'll work directly at the intersection of developer tooling, observability, and applied AI — helping engineering teams understand, debug, and improve their agents in production. The work is hands-on and high-ownership from day one.

What You'll Do

• Build core product experiences including agent investigation interfaces, eval workflows, trajectory debugging, verification, and replay systems.

• Own problems end-to-end — talk to customers, understand where their agents fail, define solutions, build them, and iterate until they work.

• Ship across the full stack with a backend emphasis: APIs, data models, internal systems, and product surfaces.

• Build and shape an AI-powered investigation agent that runs large-scale analyses across production traces.

• Design and implement platform systems including workspaces, permissions, billing, usage tracking, SDKs, and terminal-first developer experiences.

• Work directly with AI teams deploying production agents to understand their failures and translate them into product decisions.

What We're Looking For

• 0–5 years of full-stack development experience with a strong track record of shipping production software end-to-end.

• Proficiency in TypeScript, React, Next.js, Python, Node.js, and PostgreSQL in production environments.

• Backend-focused skill set including strong API design and data modeling — not pure infrastructure or distributed systems.

• Ability to engage directly with customers, identify pain points, and own solutions through to delivery.

• Experience building platform systems such as workspaces, permissions, billing, usage tracking, SDKs, or account management.

• Consistently clean, production-quality code and comfort working in fast-paced, ambiguous startup environments.

• Bonus: experience with AI agents, LLM-powered products, developer tooling, observability products, or agentic system evaluation and debugging.

• Strong CS fundamentals, whether from a top academic program or demonstrated through career experience at well-regarded tech companies or Series B+ startups.

Compensation & Benefits

• Salary: $150,000 – $275,000 annually

• Visa sponsorship: Not available

Location

On-site in San Francisco, California, United States. This is a full-time, in-office role.