About the job
As a Performance & Systems Engineer on the Codex team, you will be responsible for whole-system optimization across a complex, evolving stack. Codex spans LLM inference, cloud orchestration, agentic work management, and multiple product surfaces. Your job will be to identify and land high-leverage changes—across infrastructure, modeling, and product layers—that make Codex agents significantly faster and cheaper to serve.
Responsibilities
Hunt down and address inefficiencies across the Codex system stack, from agent behavior to LLM inference to container orchestration, and beyond.
Build tooling to measure, profile, and optimize system performance at scale.
Collaborate with researchers and engineers to land high-ROI changes that improve latency and cost.
Qualifications
Minimum
No minimum qualifications listed.
Preferred
Have experience operating across both ML systems and cloud infrastructure.
Enjoy diving into messy, ambiguous problems and emerging with clear wins.
Think holistically about performance, balancing speed, cost, and user experience.