**The Front End Infrastructure and Developer Experience** (devX) team comprises a dedicated group of senior engineers focused on developing and maintaining the world's largest security web application. We provide support to over 500 engineers within the Microsoft security organization, as well as millions of leading security engineers globally who rely on our services. Our mission is to build an engineering platform that delivers an exceptional developer experience, empowering our engineers to create the highest quality user experiences for our customers. **Responsibilities** + Lead UX architecture and define best practices, cultural standards, and engineering guidelines + Develop and maintain the end-to-end engineering platform, including development workflows, CI/CD, test automation, and production deployments using tools such as **Webpack, Playwright, and Azure DevOps** + Build and support our core **JavaScript/TypeScript runtime libraries** + Oversee development of our **component library based on Microsoft Fluent** + Mentor junior engineers and support their technical and professional growth **Qualifications** **Required:** + Bachelor’s degree in Computer Science or related field, or equivalent practical experience + 6+ years of experience in **frontend web development** , building modern, scalable, and performant applications + Proven experience as a **technical leader** , driving architecture, code quality, and cross-team collaboration + Hands-on experience with **frontend infrastructure** : build tooling, CI/CD, devops pipelines, and performance monitoring + Deep knowledge of **JavaScript/TypeScript** , browser internals, and at least one major framework (e.g. **React** ) + Experience working in **large-scale, distributed environments** and designing systems for scale and reliability + Strong understanding of **JavaScript fundamentals** (e.g. inheritance, scope, closures) and **DOM architecture** **Preferred:** + Experience building and maintaining **component libraries or design systems** (e.g. based on Fluent UI or similar) + Familiarity with tools such as **Webpack, Playwright, Azure DevOps, Storybook** , or similar + Passion for developer experience, accessibility, and performance best practices Microsoft is an equal opportunity employer. Consistent with applicable law, all qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations (https://careers.microsoft.com/v2/global/en/accessibility.html) .