Staff Backend Engineer, Financial Engineering

About the Team

Financial Engineering (FinEng) builds the financial systems behind ChatGPT, Codex, and OpenAI’s API platform. These products serve people, developers, and businesses around the world. We make them easy to buy, use, and pay for. Our systems support everything from individual subscriptions to usage-based billing and complex enterprise agreements.

We also build the foundations for how products are packaged, accessed, and used: product catalogs, SKUs and bundles, workspaces, entitlements, and usage metering. These systems connect what customers purchase to the capabilities they can access and the usage they can manage.

That reach creates challenging engineering problems. We build services and data pipelines that handle large volumes of usage and transactions, keep payments, product access, and financial records consistent across systems, and adapt as products and pricing change. The same foundations must support a simple checkout and the detailed spending controls a large business needs.

Your work will help teams launch new products faster and give customers confidence in what they are paying for. The work spans customer experiences, backend services, and data systems, with opportunities to influence technical design and see your work through to production.

We’re hiring Staff+ engineers with strong backend experience. Experience in payments, billing, or financial systems is a strong plus, but not required.

In this role, you will

• Design and build systems for purc