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Turned a 60% tracking gap into clear, trustworthy ROI insights

4-weeks project contract

Story

Bike-Resale.de, a German e-commerce brand, faced a critical attribution blind spot: Google Ads showed solid performance, but Matomo underreported paid conversions by over 60%. The marketing team was left flying blind, unsure whether to trust their agency, their tag manager, or their own data. We ran a full-stack tracking audit, uncovered the real culprit - cookie consent gaps - and delivered a clear roadmap to fix it. Within 4 days, the client had actionable next steps and renewed trust in their data.

Challenges

Matomo reported up to 60% fewer paid conversions than Google Ads
Unclear whether the issue was technical, agency-related, or due to user behavior
Attribution logic was opaque, causing confusion across the marketing team
Consent rates, tracking templates, and funnel visibility were all under question

Solutions

Conducted a full-stack audit of Matomo, Google Ads, GTM, Consent Manager, and Shopware
Ran controlled test purchases to trace conversion data loss
Identified that only 43% of users accepted cookies, breaking Matomo attribution
Delivered fixes: improved consent banner design, cleaned up URL templates, and set up goals/funnels in Matomo
Recommended lead-gen strategies to reduce cookie reliance

Outcomes

Found the attribution issue: cookie consent issues
Regained trust in marketing data with a clear explanation of the 60% gap
Stopped chasing ghosts. Marketing now makes ROI decisions with confidence
Created a roadmap for improving attribution reliability for the cookie consent issue
Enabled immediate implementation of fixes, no dev backlog required

Testimonial

Thanks again for your detailed and well-analyzed research.
- Anna Gros, Marketing Managerin @Bike Resale

Skills

Analytics Audit · Matomo · Google Ads · Google Tag Manager · Cookie Consent · Attribution Strategy · Shopware · E-commerce Tracking · Funnel Setup · Google Analytics · First-Party Data
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