Case Studies

Selected work from major brand projects involving complex web platforms, product engineering and technical leadership.

  1. Virgin Atlantic
    & Holidays

    Lead engineer on Virgin Atlantic & Holidays' large‑scale replatforming programme, unifying twelve disparate applications within a new headless architecture built with React and Next.js.

    Screenshot of the Virgin Atlantic & Holidays website; part of John Kavanagh's selected project work.

  2. Microsoft Edge
    DevTools

    Principal engineer leading AI‑driven browser tooling within Microsoft Edge DevTools, delivering in‑browser features including real‑time content simplification, integrated issue reporting, and structured developer feedback pipelines.

    Screenshot of the Microsoft website; part of John Kavanagh's selected project work.

  3. Nando’s

    Senior software engineer on the UK and Ireland replatform, migrating Nando’s customer‑facing websites from legacy Drupal to a unified headless platform built with Next.js and Storyblok, with a focus on performance, accessibility, and SEO.

    Screenshot of the Nando’s website; part of John Kavanagh's selected project work.

  4. John Lewis
    & Partners

    Senior developer in the Findability team, leading the digital implementation of the John Lewis & Partners rebrand alongside new feature development, user journey optimisation, and performance improvements.

    Screenshot of the John Lewis website; part of John Kavanagh's selected project work.

  5. The World Economic
    Forum

    Senior JavaScript developer delivering a React‑based rebuild of the World Economic Forum's online platforms, whilst also leading the introduction of new user features.

    Screenshot of The World Economic Forum website; part of John Kavanagh's selected project work.

  6. Selfridges

    Lead front‑end developer within Selfridges' e‑commerce Customer Experience team, delivering new features, considerable refactoring, and platform performance improvements.

    Screenshot of the Selfridges website; part of John Kavanagh's selected project work.

  7. Polestar

    Senior developer on Polestar's highly animated, interactive website and automotive configurators, built with Gatsby, React, and TypeScript as Volvo's former go‑faster brand evolved into an EV company.

    Screenshot of the Polestar website; part of John Kavanagh's selected project work.

  8. Boohoo
    Group

    Senior engineer supporting Boohoo Group's migration of multiple e‑commerce brands onto a unified React platform with shared, themeable Storybook components.

    Screenshot of the Boohoo Group website; part of John Kavanagh's selected project work.

  9. Lotus
    Cars

    Long‑running legacy platform engineering for Lotus Cars across vehicle configurators, model pages, pre‑owned sales, dealership tools, and launch marketing.

    Screenshot of the Lotus website; part of John Kavanagh's selected project work.

  10. IMG
    Licensing

    Sole developer for IMG Licensing's Gatsby, Contentful, and Netlify rebuild, pairing a media‑led rebrand with fast search, CMS control, client training, and enquiry growth.

    Screenshot of the IMG Licensing website; part of John Kavanagh's selected project work.

  11. Wreel
    Agency

    Long‑running development of Wreel Agency's highly animated, content‑managed website and interactive portfolio using Gatsby, React, TypeScript, GraphQL, and Contentful as the brand evolved.

    Screenshot of the Wreel Agency website; part of John Kavanagh's selected project work.

  12. LEGO

    Senior developer delivering an all‑new React e‑commerce platform designed to handle high traffic volumes and support multiple languages and currencies.

    Screenshot of the LEGO website; part of John Kavanagh's selected project work.

  13. Plex.tv

    React front‑end development for Plex's web‑based media library and player, improving browser access to personal video, audio, and image collections.

    Screenshot of the Plex.tv website; part of John Kavanagh's selected project work.

  14. Condé Nast
    Style.com

    Senior front‑end development for Condé Nast's Style.com, a fashion and technology‑led e‑commerce marketplace integrating editorial content and vendor stock systems.

    Screenshot of the Style.com website; part of John Kavanagh's selected project work.

  15. HSBC Corporate
    Banking

    Lead UI development for a set of HSBC digital transformation projects, including a React, TypeScript, Node.js, and AEM rebuild of commercial banking applications.

    Screenshot of the HSBC Corporate Banking website; part of John Kavanagh's selected project work.

  16. MOSCOT
    Eyewear

    Senior front‑end development for MOSCOT's WordPress to Shopify replatform, producing Liquid, Sass, and Node.js templates for its eyewear e‑commerce website.

    Screenshot of the MOSCOT Eyewear website; part of John Kavanagh's selected project work.

  17. BBC
    Future Media

    Sole UI developer for the award‑winning fourth major version of the BBC homepage, the first step in a substantial new online identity and visual redesign.

    Screenshot of the BBC Future Media website; part of John Kavanagh's selected project work.

  18. Red
    Central

    Sole developer for Red Central's media‑led creative studio website, built with Gatsby, TypeScript, GraphQL, and Contentful.

    Screenshot of the Red Central website; part of John Kavanagh's selected project work.

  19. Tony's
    Chocolonely

    Front‑end development for Tony's Chocolonely's colourful custom website and Chocoshop rebuild, using a standalone Node.js workflow to produce animated templates for integration into Laravel.

    Screenshot of the Tony's Chocolonely website; part of John Kavanagh's selected project work.

  20. Bose

    Front‑end development for Bose's accessible Product Support platform, using Mustache, AEM, Khoros, and Storybook to help customers access manuals, guides, troubleshooting, and community content.

    Screenshot of the Bose Product Support website; part of John Kavanagh's selected project work.

  21. ToyBoxX

    Development of ToyBoxX's highly animated, multi‑layered recording studio website using Gatsby, React, TypeScript, GraphQL, and Contentful, with parallax, glitch effects, and CMS‑managed content.

    Screenshot of the ToyBoxX website; part of John Kavanagh's selected project work.

  22. Navico

    Principal Developer on Navico's multi‑site, multilingual e‑commerce platform across three marine brands, using Node.js, Handlebars, Sass, Razor templates, and Episerver.

    Screenshot of the Navico website; part of John Kavanagh's selected project work.

  23. Linkudo

    Sole full‑stack development of Linkudo, rebuilding a classic Flash word association game as a mobile‑first Next.js product with puzzle generation, APIs, caching, and share‑card automation.

    Screenshot of the Linkudo website; part of John Kavanagh's selected project work.

  24. Dataffirm

    Front‑end development for Dataffirm's complex real‑time Angular fintech platform, using machine learning and big data to surface investment signals.

    Screenshot of the Dataffirm website; part of John Kavanagh's selected project work.

  25. Cox & Kings
    Travel

    Responsive front‑end template system for Cox & Kings' luxury travel e‑commerce website, delivered as 70+ components and 30 HTML templates for integration into an existing legacy platform.

    Screenshot of the Cox & Kings website; part of John Kavanagh's selected project work.

  26. Macmillan Education

    Senior front‑end development for Macmillan Education's Open Mind platform, turning book‑based learning into interactive QTI and Polymer web components.

    Screenshot of the Macmillan Education website; part of John Kavanagh's selected project work.

Want to find out more?

If you need senior hands‑on support with a complex React or Next.js platform, migration, performance issue, or technical SEO problem, send me the context and I'll tell you where I can help.

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