openai
Research Engineer, Codex
San Franciscofulltimemid
About this role
Join OpenAI's Codex team to advance AI-powered code generation and reasoning systems. You'll combine ML research, systems engineering, and performance optimization to develop and deploy state-of-the-art coding capabilities used by millions, working across the full stack from model training to production infrastructure.
What you'll do
- Design and execute experiments to improve code generation, reasoning, and agentic behavior in Codex models
- Develop research insights into model training, alignment, and evaluation methodologies
- Identify and resolve inefficiencies across the system stack, from agent behavior to LLM inference to orchestration
- Build tooling to measure, profile, and optimize system performance at scale
- Prototype new capabilities, debug complex issues, and ship improvements to production
- Collaborate with researchers and engineers across the full lifecycle of experimentation and deployment
What they're looking for
- Machine learning and large language model expertise
- Software engineering and rapid prototyping
- Systems optimization and performance analysis
- Cloud infrastructure and distributed systems
- Experience with code generation or software reasoning
- Ability to balance speed, cost, and user experience
- Problem-solving in ambiguous, iterative research environments
- Full-stack technical capability
Benefits
- Hybrid work model (3 days in office per week)
- Based in San Francisco, CA
- Relocation assistance provided
- Work on cutting-edge AI systems deployed globally
- Collaborate with world-class researchers and engineers
- Impact millions of users through real-world products
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