Millions of developers start their day on GitHub — and the frontend platform you build will define the quality, speed, and reliability of that experience. As a Senior Software Engineer on the React Platform team, you will design and evolve the frontend architecture, frameworks, tooling, and performance infrastructure that underpin GitHub's entire web UI — enabling engineering teams across the company to build scalable, accessible, performant, and secure React applications with confidence. You will grow your expertise across large-scale React architecture, client-side performance optimization, and platform-as-a-product thinking.

The React Platform team is part of the Core UX org in Core Productivity. We are an enablement-focused platform team — our customers are both the millions of developers who use GitHub every day and the internal engineering teams we accelerate through expert guidance, reusable patterns, and production-ready tooling. We measure our success by web performance benchmarks, developer experience scores, and how quickly product teams can go from idea to production on our platform.

We are looking for creative problem solvers and diverse thinkers, people who care about culture as well as customers and features. We believe that how we do things is as important as what we do. Big vision, a common purpose, passion for quality, curiosity, dedication, and investment in fun and collaboration are what lead to great results. Great products reflect the teams that build them.

• Design and evolve frontend frameworks, tooling, and architectural patterns that enable frontend contributors across GitHub to build scalable, accessible, and performant React applications.
• Improve client-side performance and reliability — identify and resolve latency issues, improve observability, and help establish high standards for the web platform.
• Design, develop, test and ship high-quality technical solutions.
• Collaborate with cross-functional and product engineering teams to understand needs, shape platform investments, and implement innovative solutions.
• Provide technical leadership, mentorship, pairing opportunities, and code reviews to encourage the growth of others.
• Own and advocate for the health and quality of the systems that the team builds, including participating in on-call and first responder rotations.
• Write architecture briefs and proposals, carry out code experiments, and build prototypes to learn how we can achieve planetary scale with our systems.
• Design and implement APIs to facilitate seamless integration between software components.
• Utilize CI/CD tools to set up automated pipelines for continuous integration and delivery.
• Become intimately familiar with the systems you build and take pride in writing maintainable code.

Required Qualifications:

• 6+ years experience in Software Engineering, Computer Science, or related technical discipline with proven experience maintaining and delivering production software coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, Go, Ruby, Rust, or Python

  • ​​OR Associate’s Degree in Computer Science, Electrical Engineering, Electronics Engineering, Math, Physics, Computer Engineering, Computer Science, or related field AND 5+ years experience in Software Engineering, Computer Science, or related technical discipline with proven experience maintaining and delivering production software coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, Go, Ruby, Rust, or Python

  • OR Bachelor's Degree in Computer Science, Electrical Engineering, Electronics Engineering, Math, Physics, Computer Engineering, Computer Science, or related field AND 4+ years experience in Software Engineering, Computer Science, or related technical discipline with proven experience maintaining and delivering production software coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, Go, Ruby, Rust, or Python

  • OR Master's Degree in Computer Science, Electrical Engineering, Electronics Engineering, Math, Physics, Computer Engineering, Computer Science, or related field AND 2+ years experience in Software Engineering, Computer Science, or related technical discipline with proven experience maintaining and delivering production software coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, Go, Ruby, Rust, or Python.

  • OR Doctorate in Computer Science, Electrical Engineering, Electronics Engineering, Math, Physics, Computer Engineering, Computer Science, or related field.

  • OR equivalent experience.

Preferred Qualifications:

• Strong practical skills in modern web technologies and languages including but not limited to React, TypeScript, Node.js, and GraphQL.
• Experience building and scaling large React applications in production, including shared frontend platforms, architectural patterns (e.g. data routing, state management), developer tools, or infrastructure that other engineering teams rely on to ship products.
• Experience with server-side rendering architectures and designing or consuming APIs that serve frontend applications (e.g.,GraphQL, REST, or BFF patterns).
• Experience with performance optimization and latency reduction in consumer-facing web applications (e.g., code splitting, bundle analysis, Core Web Vitals improvement).
• Experience with observability and monitoring in production environments — metrics, logging, tracing, or real-user monitoring for client-side applications.

GitHub values

• Customer-obsessed
• Ship to learn
• Growth mindset
• Own the outcome
• Better together
• Diverse and inclusive

Manager fundamentals

• Model
• Coach
• Care

Leadership principles

• Create clarity
• Generate energy
• Deliver success