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. Red Central
    Red Central

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

    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.
  2. 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.
  3. Featured case study

    John Lewis
    & Partners

    Senior developer as part of team 'Findability'. Led 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.

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.
    Read article
    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. Schema for Service Pages Without Overclaiming.
    Read article
    Schema for Service Pages Without Overclaiming.

    Schema for Service Pages Without Overclaiming

    Model service page schema without overclaiming by matching visible content, Service data, OfferCatalog, breadcrumbs, FAQs, entities, and proof clearly.

  4. How Service Pages Become Answerable in AI Search.
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    How Service Pages Become Answerable in AI Search.

    How Service Pages Become Answerable in AI Search

    How service pages become easier for AI search to retrieve and summarise through clear problems, visible proof, internal links, schema, and answers.

  5. 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.

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

  7. E‑Commerce SEO Migration: Product and Category Pages in Next.js.
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    E‑Commerce SEO Migration: Product and Category Pages in Next.js.

    E‑Commerce SEO Migration: Product and Category Pages in Next.js

    How to migrate e‑commerce product and category pages to Next.js without losing SEO value, including URLs, filters, schema, canonicals, and redirects.

  9. Should You Move a Shopify Storefront to Next.js?
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    Should You Move a Shopify Storefront to Next.js?

    Should You Move a Shopify Storefront to Next.js?

    Decide whether Shopify to Next.js is worth it by weighing storefront control, SEO, performance, checkout, apps, content workflow, cost, and risk.

  12. Next.js Multi‑Tenant Architecture.
    Read article
    Next.js Multi‑Tenant Architecture.

    Next.js Multi‑Tenant Architecture

    How to design multi‑tenant Next.js architecture across routing, domains, configuration, content, caching, previews, analytics, and team ownership.

Untangling a delivery problem?

Send the symptoms, constraints, and affected routes. I'll help identify whether the issue sits in the application, platform, content model, deployment path, or search surface.

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