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Applied AI Engineer, Codex Core Agent

The Codex Core Agent team builds the kernel of Codex and is responsible for improving the agent, accelerating research, and bringing those improvements into production. The team works across the systems that enable Codex to function as an a

Company

OpenAI

Location

San Francisco, United States; London, United Kingdom; New York City, United States; Seattle, United States

Status

Closed

Posted

2026-09-13T13:31:39.187+00:00

OpenAI's Codex Core Agent team builds the kernel of Codex — execution loops, model interfaces, shared infrastructure — and is hiring an Applied AI Engineer to make the coding agent dependable. The work covers designing agent behaviors for long-horizon coding tasks, building evaluations with research teams, tracking regressions and failure modes, and improving prompting, tool use and context construction. The posting asks for applied machine learning, LLM application, coding agent, evaluation or production AI product experience. Hybrid, across four cities, with a stated USD salary range.