Services

Next.js Architecture and Platform Consulting for Legacy Front Ends, Migrations and Recovery

Bring me in when a legacy platform or older front end has become hard to maintain, and Next.js architecture, project structure, migration planning, and live‑stack recovery all cut across the same delivery problem rather than sitting inside one narrow ticket queue.

Bring in senior Next.js architecture support when a legacy platform, older front end, or hard‑to‑maintain site needs migration planning, platform rescue, and clearer delivery direction.

Where this fits

  • Scoped advisory support for existing Next.js teams.
  • Migration planning, platform rescue, and implementation review.
  • Senior hands‑on delivery where architecture and execution overlap.

Common engagements

  • Short diagnostic engagements for an existing live stack.
  • Migration planning and implementation oversight.
  • Embedded senior support inside a delivery team.

Related hubs

  1. Hub

    Migrations to Next.js

    Choose the right Next.js migration path when an older front end, legacy platform, or hard‑to‑maintain site needs a cleaner architecture and safer migration plan.

  2. Hub

    Next.js Performance and Stability

    Choose the right performance and stability investigation when a live Next.js stack is slower, less stable, or harder to reason about after change.

  3. Hub

    Vercel Deployment Debugging

    Choose the right Vercel production fix when builds, deployments, revalidation, or auth are blocking release confidence.

  4. Hub

    Next.js Platform Architecture

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

Related scenarios

  1. Scenario

    React SPA to Next.js Migration

    Move a React SPA to Next.js before client‑rendered routes keep important pages out of search and start capping performance or delivery speed.

  4. Scenario

    Next.js Site Broke After Deploy

    Stabilise a Next.js production incident after deploy when the app works locally but the live site is now broken, inconsistent, or only failing against production conditions.

Related project experience

  1. 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.

  2. 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 development portfolio.

  3. Linkudo

    Freelance full‑stack developer for this modern reimagining of the classic browser‑based word association game. Built with Next.js, Node.js, Supabase, and Redis.

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

Supporting 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

    Ongoing support and maintenance

    Ongoing support for teams that need senior technical follow‑through after launch, migration, or a concentrated debugging engagement.

  3. Secondary service

    Hosting and platform support

    Practical hosting, deployment, and platform support around Vercel, production debugging, and operational reliability.

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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