3-6 years of engineering experience with ownership of built infrastructure
Experience building infrastructure from scratch at a startup or within a larger company
Strong fundamentals in distributed systems, cloud infrastructure, networking, CI/CD, and observability
Proficient in writing code and managing complex systems from design to production
Preference for building new systems over maintaining existing ones
Ability to assess when to prioritize careful architecture versus rapid deployment
Responsibilities
Build and operate the infrastructure for real-time decision systems
Create sandboxes and evaluation infrastructure for agent workflows
Develop CI/CD processes and internal tooling to expedite shipping
Implement instrumentation and monitoring for probabilistic systems
Manage cloud costs and architectural decisions to prevent bottlenecks
Collaborate with product engineers and customers to enhance infrastructure
Benefits
Meaningful early-stage equity
Comprehensive medical, dental, and vision coverage
$500 monthly Ramp card for commuting, meals, gym, etc.
$25 nightly meal delivery credit and quality office snacks
Direct access to world-class investors and advisors
Full Job Description
What we want you to own
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.
Who this is for
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.
Compensation & Benefits
Equity: Meaningful early-stage equity
Salary: $200K - $300K
Health: Comprehensive medical, dental, and vision
Perks: $500 monthly Ramp card for commuting, meals, gym, etc. (plus $25 in nightly meal delivery credit) and really good office snacks
Access: Direct access to world-class investors and advisors
