OpenAI
Applied AI Engineer, Codex Core Agent
$230K–$385K
San Francisco +3 · Full-time · Posted Mar 26, 2026
- Location
- San Francisco
New York City
Seattle
London, UK
About the job
Improves Codex agents’ performance and reliability on real-world software engineering tasks, translating research advances into useful, measurable production outcomes.
What you'll do
- Design agent behaviors and develop evaluations for coding tasks and long-horizon workflows.
- Improve performance through prompting, tool-use strategies, context construction, and model-facing experimentation; analyze production failures to improve robustness.
- Build feedback and data systems and partner with research, infrastructure, and product teams on agent experiences.
What they ask for
- Experience building or shipping machine learning or LLM-powered products.
- Strong Python skills and comfort with modern ML tooling.
- Experience with model evaluation, fine-tuning, or prompt design.
Nice to have
- Experience with agent frameworks or tool-using LLM systems.
- Research experience with code generation models or developer tooling; experience with large, messy datasets or production logs.
Pay
$230K – $385K USD base salary
Tools
Python
AI focus
Develop and improve coding agents, including agent behavior, evaluation, prompting, tool use, context construction, and production reliability.
Model-written summary · the original posting is authoritative