Services

Embedded Technical Leadership and Senior Engineering Support for Modern Web Teams

Some situations need more than advice. They need senior technical judgement embedded in delivery before platform risk, design drift, or weak decision‑making compounds.

Bring in principal‑level engineering support when architecture, delivery quality, and technical judgement need strengthening inside the work, not just from the sidelines.

Where this fits

  • Embedded lead‑level support across architecture, standards, and delivery.
  • Hands‑on guidance for platform direction and implementation trade‑offs.
  • Mentoring and technical alignment inside an existing team.

Common engagements

  • Interim technical lead or principal‑style delivery support.
  • Architecture review and technical direction for a complex programme.
  • Team mentoring and documentation cleanup during delivery.

Related hubs

  1. Hub

    Next.js Platform Architecture

    Choose the right architecture problem when tenancy, shared systems, or App Router complexity are slowing teams down.

Related scenarios

Related project experience

  1. BBC
    Future Media

    The sole UI developer for the award‑winning fourth major version of the British Broadcasting Corporation homepage and the first step in a thorough new online identity and look and feel.

    Screenshot of the BBC Future Media website; part of John Kavanagh's development portfolio.

  2. Boohoo
    Group

    The migration of several individual Group brand e‑commerce websites onto a newly developed, unified, React‑based platform. Enabling shared functionality and customisable components.

    Screenshot of the Boohoo Group website; part of John Kavanagh's development portfolio.

  3. Condé Nast
    Style.com

    A fashion and technology‑led e‑commerce marketplace by Condé Nast. Built in Clojure (and ClojureScript), its key feature was tight integration with the wider Condé Nast publications.

    Screenshot of the Style.com website; part of John Kavanagh's development portfolio.

  4. Cox & Kings
    Travel

    Template and component library development for this luxury travel e‑commerce platform; one of the world's oldest travel companies.

    Screenshot of the Cox & Kings website; part of John Kavanagh's development portfolio.

  5. Dataffirm

    A complex, real‑time Angular‑based web application leveraging machine learning on 'big data' and live market analytics to identify investment opportunities.

    Screenshot of the Dataffirm website; part of John Kavanagh's development portfolio.

  6. HSBC Corporate
    Banking

    Lead UI developer on a set of digital transformation projects at the world's local bank. Includes the ground‑up rebuild of their commercial banking application using Node.js and React.

    Screenshot of the HSBC Corporate Banking website; part of John Kavanagh's development portfolio.

  7. 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 development portfolio.

  8. Macmillan Education

    A sophisticated, interactive, multilingual web components e‑learning platform built with Google Polymer and QTI.

    Screenshot of the Macmillan Education website; part of John Kavanagh's development portfolio.

  9. Navico

    A complicated multi‑site, multi‑lingual, e‑commerce platform on top of Episerver using Handlebars and ASP.NET Razor. A bespoke system to offer three disparate branded experiences from a single codebase.

    Screenshot of the Navico website; part of John Kavanagh's development portfolio.

  10. Selfridges

    Lead front‑end developer within the e‑commerce Customer Experience team. Leading the delivery of new features, as well as considerable refactoring and improvement of the existing platform's performance.

    Screenshot of the Selfridges website; part of John Kavanagh's development portfolio.

  11. 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 development portfolio.

  12. The World Economic
    Forum

    Senior JavaScript developer heavily involved in delivering a React‑based 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 development portfolio.

  13. Wreel
    Agency

    Technical director and lead developer for this digital‑centric design agency. A vibrant, animated, and engaging website developed using Gatsby, React, TypeScript, and Contentful.

    Screenshot of the Wreel Agency website; part of John Kavanagh's development portfolio.

Related technical articles

Also relevant

  1. Secondary service

    Codebase audits and optimisation

    Codebase review and optimisation for teams carrying unnecessary complexity, quality drift, or avoidable front‑end performance cost.

  2. Secondary service

    Technical writing and documentation

    Technical documentation, implementation notes, and delivery‑facing writing that helps teams keep platform decisions usable after handover.

  3. Secondary service

    Partnership and advisory support

    Senior technical partnership for teams that need ongoing judgement on architecture, delivery trade‑offs, and platform direction.

Tell me what you're seeing

Send me the affected page or route, point me at the code if that helps, and tell me what you expected to happen versus what is happening now. If this connects to a Next.js migration, technical SEO drop, performance issue, launch, or platform move, include that context too. I'll come back with the clearest next step.

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