OpenAI · 2 days ago
Research Engineer, Codex
San Francisco, CA
Full-time
Hybrid
Mid, Senior Level
$380K/yr - $460K/yrOpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. As a Research Engineer on the Codex team, you will advance AI coding models' capabilities and performance through research and system optimization, collaborating with top researchers and engineers to improve code generation and reasoning systems.
Agentic AIArtificial Intelligence (AI)Foundational AIGenerative AIMachine LearningNatural Language ProcessingSaaS
Responsibilities
Design and run experiments to improve code generation, reasoning, and agentic behavior in Codex models
Develop research insights into model training, alignment, and evaluation
Hunt down and address inefficiencies across the Codex system stack—from agent behavior to LLM inference to container orchestration—and land high-leverage performance improvements
Build tooling to measure, profile, and optimize system performance at scale
Work across the stack to prototype new capabilities, debug complex issues, and ship improvements to production
Qualification
Required
Strong software engineering skills
Experience operating across both ML systems and cloud infrastructure
Ability to design and run experiments to improve code generation, reasoning, and agentic behavior in Codex models
Ability to develop research insights into model training, alignment, and evaluation
Ability to address inefficiencies across the Codex system stack
Ability to build tooling to measure, profile, and optimize system performance at scale
Ability to prototype new capabilities, debug complex issues, and ship improvements to production
Excitement to explore and push the boundaries of large language models
Creativity and rigor in open-ended research problems
Ability to thrive in highly iterative, ambiguous environments
Benefits
Relocation assistance
Company
OpenAI
OpenAI is an AI research and deployment company that develops advanced AI models, including ChatGPT. It is a sub-organization of OpenAI Foundation.
Founded in 2015
201-500 employees
H1B Sponsorship
OpenAI has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
2024 (1)
2023 (1)
2022 (18)
2021 (10)
2020 (6)
Funding
Current Stage
Growth StageTotal Funding
$79BKey Investors
The Walt Disney CompanySoftBankThrive Capital
2025-12-11Corporate Round· $1B
2025-10-02Secondary Market· $6.6B
2025-03-31Series Unknown· $40B
Leadership Team
Sam Altman
CEO & Co-Founder
Greg Brockman
President, Chairman, & Co-Founder
Recent News
2026-01-09
The Motley Fool
2026-01-09
Company data provided by crunchbase