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.

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    MOSCOT Eyewear

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:

More about me

Featured Case Studies

  1. Featured case study

    Polestar

    Senior developer working on this highly animated, interactive website and automotive configurators for Polestar, once Volvo's fledgling go‑faster brand, now turned EV company. Built with Gatsby, React, and TypeScript.

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

    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.
  3. 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.

How I Usually Help

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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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Latest Articles

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  1. Technical GEO for Websites: Entities, Structured Data, and Crawl Paths.
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    Technical GEO for Websites: Entities, Structured Data, and Crawl Paths.

    Technical GEO for Websites: Entities, Structured Data, and Crawl Paths

    Technical GEO for websites, covering indexing, renderability, entity clarity, structured data, and crawl paths without inventing an AI‑only markup layer.

  2. State Management in Angular: NgRx vs. SignalStore.
    Read article
    State Management in Angular: NgRx vs. SignalStore.

    State Management in Angular: NgRx vs. SignalStore

    NgRx Store vs. SignalStore explained with real Angular trade‑offs, including scope, TypeScript ergonomics, devtools, effects, and when neither is necessary.

  3. AI is Making Technical Debt Cheaper to Create.
    Read article
    AI is Making Technical Debt Cheaper to Create.

    AI is Making Technical Debt Cheaper to Create

    AI coding tools make code faster to produce, but technical debt still needs review, ownership, tests, documentation, and senior engineering judgement.

  4. Traffic Dropped After a Replatform: The Technical Checks I Run First.
    Read article
    Traffic Dropped After a Replatform: The Technical Checks I Run First.

    Traffic Dropped After a Replatform: The Technical Checks I Run First

    Diagnose traffic drops after a redesign, migration, or replatform by checking route parity, rendered HTML, redirects, canonicals, sitemaps, and schema.

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.

Get in touch