Senior Software Engineer & Technical Lead

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

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

I am a friendly and enthusiastic senior 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:

More about me

Featured Case Studies

  1. Featured case study

    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.
  2. 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.
  3. Featured case study

    LEGO

    Senior developer producing an allnew ecommerce platform with React. Designed to handle high traffic volumes and support multilanguage and multiple currencies.

    Screenshot of the LEGO 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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Need a senior engineer involved?

I can work directly in the codebase, review the architecture, or support the team through delivery when the work needs more than extra hands.