Software Engineer, Full-Stack - Core Experimentation

About the Role

We are looking for a full-stack engineer to help build the systems that make experimentation and rollout a first-class capability across OpenAI. You will work across frontend, backend, SDK, data, and infrastructure surfaces, with a focus on making complex workflows feel simple for the teams shipping OpenAI’s most important products.

This role is not only about adding features to a platform. It is about shaping the operating system OpenAI uses to decide what to launch, how to learn from it, and how to protect users and products as we scale. OpenAI’s next phase depends on our ability to move quickly without losing rigor, and Statsig is one of the places where that balance becomes real.

You will collaborate closely with teams building ChatGPT, Codex, model measurement workflows, consumer monetization and ads, business subscription experiences, developer products, and shared infrastructure. You will translate their launch and measurement needs into platform capabilities that can support the full company, not just one-off use cases.

In This Role, You Will

• Build product experiences and platform capabilities for experimentation, feature flags, dynamic configuration, rollout safety, and analytics.
• Partner with product teams to understand launch workflows, measurement needs, and decision points, then turn those insights into durable platform features.
• Improve SDK and server-side systems so experimentation and configuration are fast, reliable, and safe for high-scale OpenAI services.
• Help teams across ChatGPT, Codex, model measurement, ads, business subscriptions, developer products, and infrastructure use Statsig effectively.
• Design workflows that make it easier to create experiments, interpret results, monitor rollouts, and act quickly when a launch needs adjustment.
• Contribute to the technical direction of a platform that must support rapid adoption, high availability, and increasingly sophisticated product and model evaluation needs.
• Work from the Bellevue office with a team that values ownership, clear communication, and high-trust collaboration.

You Might Thrive in This Role If You

• Have strong full-stack engineering judgment and enjoy building product surfaces that sit on top of serious platform and infrastructure constraints.
• Care deeply about developer experience and can make powerful experimentation concepts feel intuitive to busy product teams.
• Are excited by the post-acquisition chapter of a high-performing team: preserving what made Statsig strong while integrating deeply into OpenAI’s product development system.
• Like working on systems where performance, reliability, and product quality all matter at the same time.
• Can move between customer conversations, product design, backend architecture, SDK behavior, and data-informed decision making.
• Want your work to influence how OpenAI ships across ChatGPT, Codex, model measurement, consumer monetization, business products, and future product surfaces.
• Value in-person collaboration and want to help shape a growing Bellevue-based team.

Location and Workplace

This role is based in Bellevue, Washington. The team works in person and uses that time to move quickly, solve ambiguous problems together, and stay close to the product teams we support.