Romain O.

🏆 Expert-Vetted (Top 1% on Upwork) · 100% Job Success · $600K+ earned · 180+ projects If your ads and your CRM tell two different stories, or your conversion numbers just stopped making sense, that's usually a tracking problem, not a marketing problem. I fix it. I've spent the last 10+ years building measurement setups that last: server-side GTM, GA4, Meta and Google CAPI, BigQuery pipelines, and CRM integrations with HubSpot, Salesforce, Pipedrive, Brevo and Klaviyo. Everything is privacy-compliant by design, so nothing breaks the next time a browser or a regulator changes the rules. Clients usually come to me when: - conversions stopped tracking after a platform or browser update - they're migrating to GA4 and don't want to lose their history - their ads, CRM and reports don't add up - they need server-side tagging done properly (Stape, Cloud Run) without breaking GDPR 🌟 Data Pipeline & Architecture - Server-side GTM (Stape, GCP Cloud Run) for durable, privacy-compliant tracking - BigQuery pipelines: incremental syncs, backfills, multi-source data warehousing - Python scripts for data normalization, backfills, and pipeline orchestration - Cloud Functions / Cloud Scheduler orchestration for automated data flows - CRM & MarTech integrations (HubSpot, Salesforce, Pipedrive, Brevo, Klaviyo) for unified reporting 🌟 Conversion Tracking & CAPI - Meta, TikTok, and Google Ads Conversion API implementation - Offline conversion pipelines (Google Ads Data Manager API), built with Python for hashing, deduplication, and batch processing - Cross-platform deduplication and event match quality optimization - GDPR-compliant PII hashing and consent-aware tracking 🌟 AI-Powered MarTech - Python-based automation connecting marketing data to AI APIs (Claude, OpenAI) - Automated anomaly detection on tracking pipelines and conversion data - AI-generated reporting summaries from Looker Studio / BigQuery data - Natural-language querying layers for non-technical stakeholders 🌟 Why work with me - Expert-Vetted, 100% Job Success, $600K+ earned - 10+ years across e-commerce, SaaS, and multi-market clients (EU, US, France) - I don't just implement tracking, I build the architecture and automation that keeps your data trustworthy as platforms and regulations shift