Fullstack Engineer; TypeScript), AI Engineering: Duo Client SDK

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As a Fullstack Engineer on the Duo Client SDK team at Git Lab, you’ll build the shared foundation for every Git Lab Duo client. Today, the logic that powers Duo in editors lives inside the Git Lab Language Server. We’re extracting it into a true software development kit (SDK): a set of well-versioned Type Script packages that editor extensions, our web-based Duo Chat on , and eventually external applications can use.

You’ll work in Type Script across frontend and backend systems. You’ll design the SDK’s Node.js core and public application programming interface (API), and work in the clients that use it. The work rewards care about interfaces, versioning, and backward compatibility as much as features because other engineers will depend on what you build.

You’ll have senior and staff engineers alongside you to help with design. You’ll own the implementation of scoped packages and ship improvements with minimal guidance while collaborating with the team on larger architectural changes.

Some examples of our projects:

• The Duo Client SDK, extracting versioned, publishable packages from the Git Lab Language Server
• The Git Lab Language Server, rebuilt on top of the SDK as our polyglot surface
• Duo Chat on the web, as one of the SDK’s first consumers

• Develop secure, well-tested, and performant Type Script features that solve technical problems of moderate scope and complexity.
• Ship small features and improvements with minimal guidance, writing tests with every merge request and contributing to code reviews and design discussions.
• Extract and publish Type Script packages from the Git Lab Language Server, migrating consumers incrementally so no parallel implementation is left to drift.
• Design durable public APIs with clear interfaces, semantic versioning, change logs, and deprecation paths for external consumers.
• Build isomorphic core packages that isolate platform-specific behavior in adapters at the edges.
• Build and improve SDK client surfaces, including Vue 3 components in Duo Chat on the web, in collaboration with product, design, and engineering teams.
• Strengthen credential handling across hosts, including bearer tokens, session cookies, and CSRF protection.
• Optimize bundle size, startup cost, and dependency weight for browser consumers, and support a Tier 2 on-call rotation for urgent engineering issues.

• Strong…