Senior Software Engineer & Technical Lead

Hands‑on technical leadership across complex Next.js and React platforms, digital transformations, technical SEO, performance, migrations and platform architecture.

  1. John Lewis
    John Lewis

I'm John, an award‑winning software engineering specialist based in sunny rainy Brighton, UK.

I am a friendly and enthusiastic senior engineer and technical leader backed by over twenty‑three years of hands‑on experience.

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

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

  • helping develop the online identity of Volvo's emerging premium EV brand;
  • leading the modernisation of the online portfolio of one of Britain's largest airlines;
  • helping a major browser vendor explore AI‑driven tools for clearer, more useful browsing experiences;
  • ... 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

    Lotus
    Cars

    Long‑running front‑end development for Lotus Cars, supporting its WordPress website, vehicle configurators, model pages, pre‑owned sales, and dealership tools.

    Screenshot of the Lotus website; part of John Kavanagh's selected project work.
  2. Featured case study

    LEGO

    Senior developer producing an all‑new e‑commerce platform with React. Designed to handle high traffic volumes and support multi‑language and multiple currencies.

    Screenshot of the LEGO website; part of John Kavanagh's selected project work.
  3. 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.

How I Usually Help

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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.

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