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Luke Brannagan

Senior Frontend Engineer Manchester, UK

luke@brannagan.co / lukebrannagan.com
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Summary

Senior Frontend Engineer specializing in scalable Design Systems, Web Performance, and Accessibility. Expert in modernizing legacy architectures and driving engineering best practices. Proven track record of reducing technical debt and mentoring teams to deliver high-performance, WCAG-compliant applications.

Tech Stack

Languages
TypeScript JavaScript (ES6+) HTML5 CSS3 C# Golang
Stack
React Next.js Node.js
Tooling
Vite Rollup pnpm ESLint Prettier Biome Storybook
Data
Zustand Redux TanStack Query
Testing
Vitest React Testing Library Playwright
Styling
Tailwind CSS CSS Modules Styled Components
CMS
Contentful Sanity Storyblok

Senior Web Platform Developer @ Kroo

Jul 2023 – Present
React Vite Zustand A11y
  • Achieved 100/100 Lighthouse Scores: Led accessibility audit ensuring full WCAG 2.1 compliance.
  • Boosted Developer Efficiency: Built scalable internal Design System using React and Vite.
  • Modernized Architecture: Migrated legacy CRA apps to Vite; implemented TanStack Query.
  • Engineering Excellence: Defined frontend architecture and best practices with Product/Design.

Frontend Engineer @ Dexla

Feb 2023 – Jun 2023
Next.js React DnD
  • Complex WYSIWYG Editor: Engineered a drag-and-drop web builder for non-technical users.

Frontend Engineer @ Primer

Jul 2022 – Nov 2022
Design Systems Performance
  • Cut Dev Time by ~50%: Scaled the GOAT Design System, streamlining frontend workflows.
  • Reduced Costs by 3-4x: Re-architected Observability platform to lower resource consumption.

Frontend Engineer @ Harbr

Apr 2022 – Jun 2022
React Redux
  • Optimized Dashboard: Enhanced core UI performance, improving load times and usability.
  • Feature Delivery: Collaborated with Backend/Design to ship features in an agile environment.

Senior / Mid / Junior Developer @ DEPT

Jan 2020 – Apr 2022
Next.js Mentorship
  • Delivered Large-Scale Apps: Built high-performance web apps for major clients.
  • Mentorship: Mentored juniors on Next.js, React patterns, and Accessibility standards.

Junior Software Developer @ Oliver James

Jan 2019 – Dec 2019
C# .NET JavaScript
  • Developed full-stack internal dashboards using C#, ASP.NET, and JavaScript.