Software Engineer, Codex Core Agents

About the Team

The Codex Core Agent team builds the kernel of Codex. We own making the agent better, accelerating research, and making those improvements real in production for our users.

That means working across the systems that make Codex actually function as an agent in the real world: the production performance envelope around tokens, latency, reliability, cost, and capacity; the core execution loop and interfaces that turn models into useful behavior; the shared infrastructure that enables other teams to build on Codex; and the feedback loops that turn real-world usage into better models and better agent behavior over time.

You Might Be a Good Fit If You

• Have strong experience in distributed systems or infrastructure engineering.
• Have built systems involving containers, sandboxing, or virtualization.
• Are comfortable working across backend systems, APIs, and developer tooling.
• Care deeply about system reliability, performance, and security.
• Enjoy working on ambiguous, zero-to-one problems.
• Want to help build the systems that turn model capability into a dependable software engineering agent.

Bonus Points

• Experience with code execution platforms, CI/CD systems, or build systems.
• Experience coding in Rust
• Familiarity with LLMs, agents, or tool-use frameworks.
• Background in security engineering or isolation systems.
• Experience building developer platforms, IDE tooling, or open source infrastructure.

About OpenAI

OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. We push the boundaries of the capabilities of AI systems and seek to safely deploy them to the world through our products. AI is an extremely powerful tool that must be created with safety and human needs at its core, and to achieve our mission, we must encompass and value the many different perspectives, voices, and experiences that form the full spectrum of humanity.

We are an equal opportunity employer, and we do not discriminate on the basis of race, religion, color, national origin, sex, sexual orientation, age, veteran status, disability, genetic information, or other applicable legally protected characteristic.

For additional information, please see OpenAI’s Affirmative Action and Equal Employment Opportunity Policy Statement.

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