Full GA4 migration and 4.6× ROAS on Google Ads after tracking rebuild.

The challenge

GridFlow was running Google Ads with UA conversion data that was sunset. Post-migration ROAS tanked to 1.9× because the algorithm was learning on incomplete data.

What we did

• Emergency GA4 migration with server-side event collection
• Enhanced conversions setup for Google Ads
• Rebuilt Google Ads conversion actions pointing to server-side events
• Performance Max restructure with proper audience signals
• Cross-channel reporting to see Google vs Meta ROAS accurately

Results

• ROAS recovered from 1.9× to 4.6× within 6 weeks of clean data flow
• Google algorithms re-optimized with accurate Purchase signals
• CAC dropped 28% as bids became more efficient
• Monthly reporting now accurate to within 1.5% of actual Shopify revenue