Job Description
Job DescriptionAbout 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
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Build core product experiences including agent investigation interfaces, eval workflows, trajectory debugging, verification, and replay systems.
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Own problems end-to-end — talk to customers, understand where their agents fail, define solutions, build them, and iterate until they work.
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Ship across the full stack with a backend emphasis: APIs, data models, internal systems, and product surfaces.
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Build and shape an AI-powered investigation agent that runs large-scale analyses across production traces.
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Design and implement platform systems including workspaces, permissions, billing, usage tracking, SDKs, and terminal-first developer experiences.
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Work directly with AI teams deploying production agents to understand their failures and translate them into product decisions.
What We're Looking For
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0–5 years of full-stack development experience with a strong track record of shipping production software end-to-end.
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Proficiency in TypeScript, React, Next.js, Python, Node.js, and PostgreSQL in production environments.
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Backend-focused skill set including strong API design and data modeling — not pure infrastructure or distributed systems.
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Ability to engage directly with customers, identify pain points, and own solutions through to delivery.
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Experience building platform systems such as workspaces, permissions, billing, usage tracking, SDKs, or account management.
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Consistently clean, production-quality code and comfort working in fast-paced, ambiguous startup environments.
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Bonus: experience with AI agents, LLM-powered products, developer tooling, observability products, or agentic system evaluation and debugging.
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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
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Salary: $150,000 – $275,000 annually
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Visa sponsorship: Not available
Location
On-site in San Francisco, California, United States. This is a full-time, in-office role.