Principal Software Engineer Job at Microsoft Corporation (Multiple Locations)

Job Description

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.

Job Responsibility

Contribute to the architectural design and evolution of GitHub's React platform, with a focus on performance, scalability, and developer experience
Help drive the migration of key UI surfaces from Rails server-rendered views to a modern React-based application architecture with independent deployment and rendering
Identify and resolve frontend performance bottlenecks across page load (LCP), interaction latency (INP), and layout stability (CLS)
Build platform-level primitives and patterns (state management, error handling, data fetching, lazy loading) that enable feature teams to ship faster with fewer mistakes
Collaborate with design system, accessibility, and infrastructure teams to ensure platform changes meet cross-cutting quality standards
Contribute to architectural decision-making for the frontend platform, including rendering strategies, build tooling, and framework evolution
Produce technical proposals and design documents for cross-team initiatives
Support and mentor engineers across the organization on modern frontend architecture and performance best practices
Participate in code reviews to ensure quality, consistency, and adherence to platform patterns across a large, multi-team codebase

Requirements

9+ 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
6+ years of experience working with React, TypeScript, CSS, and frontend tooling (e.g., Webpack, Vite, ESLint, Jest)
6+ years of experience building frontend applications using React-based frameworks or libraries (e.g., Next.js, Remix, TanStack Router/Query)

Nice to have

Experience with frontend platform or infrastructure work (application frameworks, build systems, shared libraries)
Experience migrating legacy frontend architectures to modern patterns at scale
Experience with server-side rendering, streaming, and hybrid rendering strategies
Familiarity with design systems or component library development
Extensive experience with TypeScript in large codebases
Prior experience with Ruby on Rails or other server-side frameworks
Experience navigating how different concerns within the frontend space overlap (accessibility, performance, UX consistency) and crafting execution strategies that account for all of them
Strong understanding of web performance fundamentals (Core Web Vitals, rendering pipelines, JavaScript execution cost, network optimization)
Excellent written and verbal communication skills

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Principal Software Engineer

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