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Experiment · exp-001 · A/B · client-side · SRP
SRP sort order redesign
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Search · COS · 2025-11-01 – 2025-11-21 · 20 days · anna.schmidt@mobile.de
Created in Kameleoon on 2025-10-15 - 17 days before the experiment launched.
What it was
The default SRP sort order on mobile.de ranked listings by recency. Our hypothesis was that buyers who see the most relevant listings first — scored by match quality against their saved search criteria — would be more likely to contact a dealer without needing to refine. We tested a relevance-first ranking model built by the Search ML team against the existing recency default across all authenticated SRP sessions in Germany.
What we learned
Learning
Relevance-first ranking increased dealer contact rate by +4.2% (95% CI: +1.8% to +6.6%, reliability 0.97). Search refinement rate dropped by 0.8% — users needed to refine less because the first page already matched their intent. Bounce rate was flat. Rolled out to 100% of authenticated SRP sessions on 2025-11-25. The ML model is now the production default.
anna.schmidt@mobile.de · 2025-11-22 · current
TouchpointSRP