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AI Engineer, Agent Infrastructure

Zed
3 hours ago
Full-time
On-site
San Francisco, California, United States
The Role

We're hiring an engineer to own the infrastructure layer behind our production AI agents. This is not a prompt engineering role. It's not a UI role. It's about the harness around LLMs — the systems that determine how agents actually execute tasks, interact with tools, access internal and external systems, stay within permission boundaries, and behave reliably in production. You'll sit at the intersection of backend infrastructure and product, and what you build will define how AI is deployed across the company. What You'll Work On

Build and own the execution layer for AI agents — task orchestration, tool calling, state management Define how agents interact with internal systems and external APIs Design sandboxed environments and permissioning models for safe, controlled agent execution Build evaluation, monitoring, and debugging infrastructure for agent behavior in production Integrate agents into real product workflows where correctness and reliability are non-negotiable Improve system performance across latency, cost, and quality tradeoffs What You Bring

Direct experience shipping production LLM or agent systems end-to-end — orchestration, evaluation, reliability, not just prototypes Strong backend or infrastructure engineering foundation (distributed systems, APIs, platform engineering) Experience with workflow orchestration, automation systems, or agent frameworks Familiarity with evaluation and observability loops for AI systems Ability to think across both infrastructure concerns and product behavior — this role requires both Strong Signals

You've built agent systems that take real actions, not just generate text You've designed execution environments — task runners, sandboxes, job systems You've worked on AI that's deeply embedded in a real product, not a side project or internal tool You have experience with observability and evaluation loops for AI systems in production Why This Role

Most teams are still prototyping. We're past that. This role determines whether our agents are reliable or brittle, safe or risky, useful or demo-only. You'll be building the layer that makes production AI actually work — at a company where AI is core to how we underwrite, operate, and scale. We hire exceptional people from diverse backgrounds because different perspectives build better products. If you're excited about this role but don't check every box, apply anyway. We value potential, ownership, and alignment with our values more than perfect résumés. We are an equal opportunity employer and do not discriminate based on legally protected characteristics. We provide reasonable accommodations throughout the hiring process. Compensation includes salary, equity, and benefits. Final offers are based on role scope, location, and experience.