Full Stack Engineer (US)

What you'll do

• Build core product experiences across the Judgment platform, 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 what should exist, build it, and iterate until it works
• Ship across the full stack with a backend emphasis, APIs, data models, internal systems, and product surfaces
• Build the Judgment Agent and shape how it runs large-scale investigations across production traces
• Design and implement platform systems: workspaces, permissions, billing, usage, SDKs, and terminal-first developer experiences
• Work directly with AI teams building production agents, understand their failures, and turn those into product decisions

What you need

• We need a full-stack engineer with 0-5 years of experience who has shipped production products end-to-end and has a backend lean. You should be comfortable working in a fast-paced, ambiguous startup environment and have a track record of building great software at reputable companies (Series B+ startups or strong tech companies). Bonus points if you have experience with AI agents, developer tools, or observability products.

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