Marketplace
Technical SEO recovery after a migration went wrong
Diagnosing and reversing a 58% organic traffic loss for a marketplace, then rebuilding the foundations properly.
- Client
- Halden Marketplace
- Year
- 2024
- Role
- Growth · Engineering
- Result
- Traffic recovered in 14 weeks
The problem
A replatform had shipped with a client-rendered catalogue and no server-side fallback. Two thirds of the index disappeared over six weeks.
What we did
We triaged in the first fortnight, restored crawlability, then spent the following quarter fixing what the migration had papered over.
- Server-rendered catalogue and canonical strategy
- Redirect map covering 240k legacy URLs
- Core Web Vitals brought inside thresholds on mobile
Outcome
Organic sessions returned to pre-migration levels in fourteen weeks and were 22% above baseline by the end of the year.
