Principal Software Engineer & Technical Lead

Handson engineering leadership for complex digital transformation programmes. I help product and engineering teams turn fragile legacy web estates into faster, more maintainable platforms that are easier to scale, govern, and improve.

I'm John, an awardwinning software engineering specialist based in sunny Brighton, UK.

I am a friendly and enthusiastic principal software engineer and technical leader backed by over twentythree years of handson experience.

I help teams and clients design, build and improve websites, applications and web platforms, pairing architecture, delivery judgement and handson TypeScript, React, HTML, and CSS.

My portfolio is diverse; I work with global clients, solving real-world problems, including:

  • leading a team of developers for the world's local bank, rebuilding their commercial banking platform;
  • helping a major browser vendor explore AIdriven tools for clearer, more useful browsing experiences;
  • helping prospective car buyers find just the right configuration for their next sports car;
  • ... and enhancing the website of a local toyshop so that they could continue trading during lockdown.
More about me

Featured Case Studies

  1. Featured case study

    Nando’s

    Senior software engineer on the UK and Ireland replatform, migrating Nando’s customerfacing 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.
  2. Featured case study

    Virgin Atlantic
    & Holidays

    Lead engineer on this massive replatforming project, unifying twelve disparate applications under a new headless architecture with React and Next.js.

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

    The World Economic
    Forum

    Senior JavaScript developer heavily involved in delivering a Reactbased rebuild of the World Economic Forum online platforms, including leading the introduction of new user features.

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

Availability

I am currently leading a new digital transformation engagement, with availability for selected consulting and engineering delivery from September 2026. Short diagnostics or urgent work may be possible sooner.

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Planning a platform change?

I help teams make difficult platform work clearer, from architecture decisions and migrations to launch recovery, performance, and search visibility.