Advanced Meta / GA4 / Firebase Attribution / Analytics - Need EXPERT ONLY for immediate job.

**Advanced Marketing Attribution Specialist Needed — Meta, GA4, Firebase, Web + Mobile App Ecommerce** We’re looking for a highly experienced marketing attribution specialist to help audit, diagnose, and improve tracking across a large-scale ecommerce business generating millions in revenue. This is a short-term contract for a senior expert who can review and troubleshoot attribution across Meta Pixel/CAPI, GA4, Firebase, mobile app events, website checkout tracking, and related ecommerce analytics systems. The goal is to identify what is causing attribution discrepancies, duplicate or missing events, inaccurate revenue reporting, and inconsistencies between Meta, GA4, Firebase, and internal ecommerce data. Ideal candidate should have direct experience with: * Meta Pixel, Conversions API, event deduplication, and purchase attribution * GA4 ecommerce tracking and server/client-side event validation * Firebase/mobile app event tracking * Web + app ecommerce attribution flows * Diagnosing duplicate purchase events, inflated attribution, missing conversions, and cross-platform discrepancies * Large-scale ecommerce accounts doing $1MM+ annually in revenue * Multi-touch / multi-channel attribution analysis across Meta, Google, GA4, Firebase, and internal data Please include examples of past attribution audits or tracking fixes you’ve completed for high-volume ecommerce brands, especially businesses doing over $1MM annually. We are only looking for someone highly skilled who can move quickly, identify the issue, and provide a clear implementation plan.