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Software Engineer, Codex Core Agents

OpenAI· Applied AI
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San Francisco, New York City, Seattle, London, UK$230k - $385kFull-timePosted 7mo ago

About the role

Engineers to build infrastructure powering Codex agents in production, focusing on systems that let models safely execute code, interact with tools, complete long-running tasks, and operate reliably and efficiently at scale.

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 code generated by models.
  • Create state and memory systems that allow agents to persist context across long-running tasks.
  • Optimize tokens, latency, reliability, and cost across Codex’s production fleet.
  • Support model rollouts, capacity planning, and the core tradeoffs between quality, speed, and economics to manage a fleet of frontier agents at scale.
  • Build shared platform capabilities that unblock product teams, partner teams, and open source Codex.

Qualifications

  • Have strong experience in distributed systems or infrastructure engineering.
  • Have built systems involving containers, sandboxing, or virtualization.
  • Are comfortable working across backend systems, APIs, and developer tooling.
  • Care deeply about system reliability, performance, and security.
  • Enjoy working on ambiguous, zero-to-one problems.
  • Want to help build the systems that turn model capability into a dependable software engineering agent.

Skills

Required:Distributed systemsContainers / sandboxing / virtualizationBackend systems, APIs, developer toolingReliability, performance, security

Benefits

  • Medical, dental, and vision insurance for you and your family, with employer contributions to Health Savings Accounts
  • Pre-tax accounts for Health FSA, Dependent Care FSA, and commuter expenses (parking and transit)
  • 401(k) retirement plan with employer match
  • Paid parental leave (up to 24 weeks for birth parents and 20 weeks for non-birthing parents), plus paid medical and caregiver leave (up to 8 weeks)
  • Paid time off: flexible PTO for exempt employees and up to 15 days annually for non-exempt employees
  • 13+ paid company holidays, and multiple paid coordinated company office closures throughout the year for focus and recharge, plus paid sick or safe time (1 hour per 30 hours worked, or more, as required by applicable state or local law)
  • Mental health and wellness support
  • Employer-paid basic life and disability coverage
  • Annual learning and development stipend to fuel your professional growth
  • Daily meals in our offices, and meal delivery credits as eligible
  • Relocation support for eligible employees
  • Additional taxable fringe benefits, such as charitable donation matching and wellness stipends, may also be provided.
Last updated Jul 16, 2026. Interested? Apply on the company site.

About OpenAI

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