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.

About the Role
Were looking for engineers to build the infrastructure that powers Codex agents in production. This role focuses on the systems that let models safely execute code interact with tools complete long-running tasks and operate reliably and efficiently at scale.

Youll design and operate the infrastructure behind sandboxed execution orchestration stateful workflows app-server and SDK boundaries and model rollouts. Youll work at the intersection of distributed systems developer tooling and AI building primitives that make Codex faster safer more reliable and easier for the rest of the organization to build on.

What Youll Do

• Design and build execution environments for AI agents including sandboxing isolation and reproducibility.

• Develop systems for agent orchestration across multi-step tool-using workflows.

• Build infrastructure for running testing and debugging code generated by models.

• Create state and memory systems that allow agents to persist context across long-running tasks.

• Optimize tokens latency reliability and cost across Codexs production fleet.

• Support model rollouts capacity planning and the core tradeoffs between quality speed and economics to manage a fleet of frontier agents at scale.

• Build shared platform capabilities that unblock product teams partner teams and open source Codex.

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.

• 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 OpenAIs Affirmative Action and Equal Employment Opportunity Policy Statement.

Background checks for applicants will be administered in accordance with applicable law and qualified applicants with arrest or conviction records will be considered for employment consistent with those laws including the San Francisco Fair Chance Ordinance the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act for US-based candidates. For unincorporated Los Angeles County workers: we reasonably believe that criminal history may have a direct adverse and negative relationship with the following job duties potentially resulting in the withdrawal of a conditional offer of employment: protect computer hardware entrusted to you from theft loss or damage; return all computer hardware in your possession (including the data contained therein) upon termination of employment or end of assignment; and maintain the confidentiality of proprietary confidential and non-public addition job duties require access to secure and protected information technology systems and related data security obligations.

To notify OpenAI that you believe this job posting is non-compliant please submit a report through this form. No response will be provided to inquiries unrelated to job posting compliance.

We are committed to providing reasonable accommodations to applicants with disabilities and requests can be made via this link.

OpenAI Global Applicant Privacy Policy

At OpenAI we believe artificial intelligence has the potential to help people solve immense global challenges and we want the upside of AI to be widely shared. Join us in shaping the future of technology.

Required Experience:

Unclear Seniority