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Applied AI Engineer, Codex Core Agent

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

About the role

Engineer role focused on bringing Codex agents from demos to dependable production tools by improving agent performance on real software engineering tasks, with emphasis on measurable user outcomes and economic value.

Responsibilities

  • Design and iterate on agent behaviors across real-world coding tasks and long-horizon workflows.
  • Work closely with research to develop and run evals to measure agent performance, regressions, failure modes, and edge cases.
  • Improve performance through prompting, tool-use strategies, context construction, and model-facing experimentation.
  • Analyze failures in production and systematically improve robustness and reliability.
  • Build feedback loops and data systems that get better real-task data into evaluation and research.
  • Work with product teams to shape user-facing agent experiences and the interfaces the agent depends on.
  • Help define what “good” looks like for agents completing complex tasks end-to-end.

Qualifications

  • Have experience building or shipping machine learning or LLM-powered products.
  • Are strong in Python and comfortable with modern ML tooling.
  • Have worked on model evaluation, fine-tuning, or prompt design.
  • Think in terms of systems and user outcomes, not just model metrics.
  • Enjoy debugging messy, real-world failures and turning them into improvements.
  • Want to work in the layer that turns research and model potential into systems that actually work for users.

Skills

Required:PythonModel evaluationPrompt design

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
  • 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 Sep 24, 2026. Interested? Apply on the company site.

About OpenAI

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