Senior Software Engineer (Typescript), AI Clients: Duo CLI

GitLab is the intelligent orchestration platform for DevSecOps. GitLab enables organizations to increase developer productivity, improve operational efficiency, reduce security and compliance risk, and accelerate digital transformation. More than 50 million registered users and more than 50% of the Fortune 100* trust GitLab to ship better, more secure software faster. The same principles built into our products are reflected in how our team works: we embrace AI as a core productivity multiplier, with all team members expected to incorporate AI into their daily workflows to drive efficiency, innovation, and impact. GitLab is where careers accelerate, innovation flourishes, and every voice is valued. Our high-performance culture is driven by our values and continuous knowledge exchange, enabling our team members to reach their full potential while collaborating with industry leaders to solve complex problems. Co-create the future with us as we build technology that transforms how the world develops software. * Fortune 500® is a registered trademark of Fortune Media IP Limited, used under license. Claim based on GitLab data. Fortune 100 refers to the top 20% ranked companies in the 2025 Fortune 500 list, published in June 2025. Fortune and Fortune Media IP Limited are not affiliated with, and do not endorse products or services of GitLab. An overview of this role As a Senior Software Engineer on the Duo CLI functional team, part of the Developer Clients group within GitLab's AI Clients stage, you'll design and build tools that bring GitLab Duo into developers' daily terminal workflows. You'll shape AI-assisted experiences across GitLab Duo CLI and its supporting infrastructure, working mainly in TypeScript across the frontend and backend and making key architectural decisions about the CLI's future direction. You'll also have opportunities to contribute across Developer Clients, including our JetBrains plugin in Kotlin and our VS Code extension in TypeScript, when shared features, components, or cross-platform consistency call for it. You'll provide technical leadership by breaking down complex problems, aligning on long-term direction, and maintaining a high bar for code quality, performance, and reliability. You'll collaborate closely with engineers across Developer Clients and the wider AI Clients stage, including the Duo Client SDK and Duo Chat groups, to make GitLab Duo fast, intuitive, and deeply integrated wherever developers work. Some examples of our projects: Duo CLI GitLab Language Server GitLab Duo plugin for JetBrains IDEs GitLab Duo extension for VS Code What you’ll do Own the design, development, and evolution of GitLab Duo CLI features from problem definition with Product through implementation, rollout, and iteration, measuring success through feature usage and feedback. Build interactive terminal experiences in TypeScript, with careful command and flag design, clear output formatting, scripting-friendly behavior, and backward compatibility. Drive reliability, observability, and performance improvements for the CLI, measuring progress through reliability and performance metrics while reducing technical debt as the product and its usage grow. Collaborate with Product, Design, and engineers across Developer Clients and the wider AI Clients stage to align technical decisions with GitLab's broader strategy. Champion product quality, security, and developer experience through thoughtful reviews and mentorship. Contribute to IDE extension work across the group when useful, including the JetBrains plugin in Kotlin and the VS Code extension in TypeScript. What you’ll bring Strong proficiency in TypeScript and an interest in developer tooling and command-line interface design. Experience building or maintaining command-line tools or other developer-facing tooling, including command and flag design, terminal user interfaces, output formatting, scripting-friendly behavior, and backward compatibility. Experience owning technical problems end to end, making sound architectural trade-offs, and guiding other engineers through code reviews and mentorship. Clear written and spoken English communication skills and comfort working in a fully remote, largely asynchronous environment. Alignment with GitLab's values and commitment to an inclusive culture. Experience with IDE extension development, such as JetBrains plugins in Kotlin or VS Code extensions, and understanding of the Language Server Protocol (LSP), language serv