Software Engineer, Codex Core Agents

Skills

About the Role

You'll build the infrastructure that powers Codex agents in production. You'll design execution environments with sandboxing and isolation, build orchestration for multi-step tool-using workflows, create state and memory systems for long-running tasks, and optimize tokens, latency, reliability and cost across the production fleet while supporting model rollouts and capacity planning.

Requirements

• Strong experience in distributed systems or infrastructure engineering
• Experience building systems involving containers, sandboxing, or virtualization
• Comfortable working across backend systems, APIs, and developer tooling
• Care about system reliability, performance, and security
• Enjoy ambiguous, zero-to-one problems

Responsibilities

• Design and build execution environments for AI agents, including sandboxing, isolation, and reproducibility
• Develop systems for agent orchestration across multi-step, tool-using workflows
• Build infrastructure for running, testing, and debugging model-generated code
• Create state and memory systems that let agents persist context across long-running tasks
• Optimize tokens, latency, reliability, and cost across Codex's production fleet
• Support model rollouts, capacity planning, and tradeoffs between quality, speed, and economics
• Build shared platform capabilities for product teams, partner teams, and open source Codex

Benefits

• Medical, dental, and vision insurance with employer HSA contributions
• Pre-tax Health FSA, Dependent Care FSA, and commuter accounts
• 401(k) with employer match
• Paid parental leave (up to 24 weeks birth parents, 20 weeks non-birthing parents) plus paid medical and caregiver leave (up to 8 weeks)
• Flexible PTO for exempt employees; up to 15 days for non-exempt
• 13+ paid company holidays and coordinated office closures, plus paid sick or safe time
• Mental health and wellness support
• Employer-paid basic life and disability coverage
• Annual learning and development stipend
• Daily meals in offices and meal delivery credits
• Relocation support for eligible employees
• Charitable donation matching and wellness stipends
• Equity
• Performance-related bonus