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