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Technical SEO Recovery and Debugging for JavaScript Websites

When search performance falls after something changed in the platform, the likely cause is often technical rather than editorial.

Recover traffic, rankings, crawlability, and indexation after a release, redesign, or migration changes the technical signals search engines rely on.

Short Answer

When search visibility drops after a release or migration, treating the loss as one vague SEO problem usually slows recovery down. Ranking, rendering, crawlability, indexing, metadata, redirects, and templates need separating, so the pages that actually lost value can be fixed without adding more platform risk.

Why It Matters

When organic visibility has dropped, I help commercial teams separate ranking, rendering, crawl, indexing, redirect, and template faults so recovery effort is not spread across the wrong fixes.

Common Situations

  • Traffic dropped after a redesign, migration, or deployment.
  • Crawl discovery issues around sitemaps, robots rules, or rendered links.
  • Redirect, canonical, or metadata mistakes that split or suppress important URLs.

Recovery work moves faster once ranking, rendering, crawling, redirect, and indexation failures are separated instead of treated as one general SEO drop.

What I Look at First

I usually start by comparing rendered output, indexable HTML, metadata, canonicals, redirects, sitemap signals, robots directives, crawl behaviour, Search Console data, and recent release changes.

What Usually Changes

  1. Lost or damaged URLs are mapped against route, template, redirect, canonical, and rendered HTML changes.

  2. Crawl, rendering, indexing, metadata, and ranking signals are separated before recovery work starts.

  3. Search‑critical templates and internal links are checked against what users and crawlers can actually reach.

  4. Recovery actions are prioritised by commercial exposure and fix confidence.

  5. The team knows what to ship, what to monitor, and what evidence to re‑check.

How This Usually Works

  1. Technical Diagnostic

    A focused review of affected routes, templates, deployment behaviour, crawl signals, CMS behaviour, performance bottlenecks, or code paths, followed by a prioritised fix plan the team can take into delivery.

  2. Recovery Sprint

    A short, concentrated engagement for a defined technical SEO, performance, CMS, Vercel, migration, or production issue where the business needs the cause isolated and the first fixes moved quickly.

  3. Embedded Delivery Support

    Senior hands‑on support inside an existing team where architecture, implementation, review, and delivery judgement all matter, especially when the work cannot be handed over as isolated tickets.

This May Not Be the Right Fit If

  • You only need generic SEO content writing, a broad audit deck, or reporting that stops before engineering remediation. If the issue is a live traffic loss after a launch, Traffic Drop After a Redesign or Replatform may be the better starting point.
  • The problem is not tied to rendered output, redirects, canonicals, crawl signals, or route behaviour that can actually be fixed. If the core issue is JavaScript rendering or indexing, JavaScript SEO Rendering and Indexing Fix is the more focused service.

Contact me about your recovery

A short description of the affected route, Search Console signal, or production symptom is enough. I'll read it and suggest the next step.

Get in touch

Related Project Work

  1. Screenshot of the Nando’s website; part of John Kavanagh's development portfolio.

    A Complete Migration and Replatform for Nando’s

    On Nando’s, the migration tied structured data, restaurant‑page improvements, local discovery, and measurable search uplift into one Next.js and Vercel delivery.

    View project
  2. Screenshot of the John Lewis website; part of John Kavanagh's development portfolio.

    The Optimisation and Rebrand of johnlewis.com

    On John Lewis, front‑end optimisation work on a high‑traffic retail platform had to protect search‑visible commercial pages while the brand changed.

    View project

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