Senior Software Engineer, GitHub

GitHub is changing the way the world builds software, and we want you to help. We're looking for a Senior Software Engineer to join the Core UX organization and contribute to the foundation of GitHub's UI platform. More of the world's development data lives on GitHub than anywhere else. Helping developers navigate, understand, and collaborate on that data is a core part of our mission. At the heart of these efforts is a growing React-based platform, shared UI components, and foundational infrastructure that enables product engineers to ship accessible, performant, and scalable UI by default. This role sits at the intersection of frontend architecture, performance, and developer experience. You will work on modernizing GitHub's web UI, evolving the React application framework, improving Core Web Vitals across key user flows, and building platform-level solutions (state management, error handling, navigation, lazy loading) that product teams rely on daily. Your work will directly impact the speed, reliability, and quality of GitHub's product experience for millions of developers. We're looking for someone with deep expertise in React, frontend architecture, and performance who has demonstrated an ability to modernize complex, large-scale web applications with measurable results.