Sr Principal Engineer - UI

🏢 About F5

F5 is a global leader in application security and delivery, dedicated to bringing a better digital world to life. Their teams empower organizations to create, secure, and run applications that enhance the digital experience. With a focus on cybersecurity and innovation, F5 protects consumers from fraud and enables companies to focus on building world-class products.

🎯 The Role

As a Senior Principal UI Engineer, you will shape the technical future of F5's BIG-IP and BIG-IQ Central Manager products. This is a high-impact leadership role where you will design easy-to-use, secure, and performant features for applications spanning on-premises and multi-cloud architectures. You will be at the forefront of defining how customers manage highly secure application services globally.

🛠️ Tech Stack

• React, Angular, TypeScript, JavaScript
• HTML5, CSS3, SASS/LESS
• Micro-frontends, WebAssembly (WASM)
• Jest, Cypress, Playwright, CI/CD

💼 What You'll Do

• Define and implement scalable UI architectures in collaboration with global architects.
• Architect reusable component libraries and comprehensive design systems.
• Lead proof-of-concept initiatives for emerging technologies like micro-frontends and WASM.
• Conduct deep code reviews and enforce strict coding standards and best practices.
• Champion performance optimizations, including code splitting, lazy loading, and accessibility compliance (WCAG/ARIA).
• Mentor and guide senior UI engineers to foster a culture of technical excellence.

✅ What You'll Need

• 12+ years of experience in computer science or a related technical field.
• Expert-level mastery of both React and Angular ecosystems.
• Deep understanding of web performance APIs, accessibility, and security best practices.
• Experience integrating frontend systems with complex RESTful APIs and backend services.
• Ability to work flexible hours to collaborate effectively with international teams.
• Strong problem-solving abilities and a history of driving technical consensus.

🌟 Nice to Have

• Experience building internal developer platforms or improving developer productivity tooling.
• Advanced knowledge of visual regression testing and automated testing strategies.