Senior Software Engineer - Infrastructure

• Product infrastructure. Build and operate the infrastructure behind our real-time decision systems — durable execution, workflow orchestration, reliability, and performance for products customers run their business on.
• Agent infrastructure. Build the sandboxes, evaluation infrastructure, and harnesses our engineers use to develop and ship agent workflows, including the compute environments agents execute in.
• The developer platform. CI/CD, deployment, local development, and internal tooling — the abstractions that let the team ship in days rather than quarters.
• Reliability and observability. Instrumentation, monitoring, incident response, and debugging tooling for systems whose failure modes are often probabilistic rather than deterministic.
• Cost and scale. Cloud and inference costs as the product footprint grows, and capacity and architecture decisions made before they become bottlenecks.
• Partner across engineering. Work directly with the product engineers building on your infrastructure, and with the customers affected by it.
• 3–6 years of engineering experience with meaningful ownership of infrastructure you built rather than inherited.
• Zero-to-one experience. You've built infrastructure from scratch at a startup, or stood up new systems on a team inside a larger company.
• Strong infrastructure fundamentals across distributed systems, cloud infrastructure, networking, CI/CD, and observability.
• Real software engineering. Infrastructure at Probook means writing code and owning complex systems end to end, from design through production.
• Breadth over depth. You'd rather build new systems than operate mature ones, and you move up the stack when that's where the problem is.
• Judgment. You know when a system deserves careful architecture and when it deserves to be finished this week.

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