Chowdhury M.

Full-Stack Marketing Engineer: GA4, GTM, Meta CAPI & Attribution Pro

Is your ad spend outperforming what your dashboards show? That gap is almost always a tracking problem — not a marketing one. I'm a full-stack marketing engineer: I fix broken conversion tracking and attribution, and I can also build the systems around it — CRM webhooks, dashboards, custom integrations — so the fix doesn't fall apart the next time your stack changes. Common problems I solve: - GA4 showing fewer purchases than your store's real order count - Meta CAPI missing events after iOS 14 and browser tracking-prevention changes - Leads that convert in your CRM days later, with no signal ever sent back to Google/Meta Ads - Cross-domain or iframe checkout flows losing attribution mid-funnel - Messy, duplicated, or half-migrated GA4 setups inherited from a previous agency What I do: - GA4 setup, event configuration, and enhanced ecommerce tracking - Google Tag Manager — clean, scalable, documented implementations - Server-side tracking (Google Cloud/Stape) for Meta CAPI, TikTok, Bing, Google Ads - Custom JavaScript for dataLayer pushes, userID stitching, and cross-domain tracking - CRM-to-ad-platform offline conversion pipelines — click IDs, hashed data, deduplication logic - Shopify Checkout Extensibility and checkout-compatible dataLayer builds - Consent Mode v2 and first-party tracking for cookie compliance - Looker Studio + BigQuery dashboards that turn raw events into decisions - Google Apps Script automation — CRM ingestion, lead-tracking workflows, custom Sheets-based tools - Custom builds when the fix needs more than a tag: webhooks, APIs, internal tools (Next.js/React/Node.js) Track record: 100% Job Success Score, $30K+ earned on Upwork, 5+ years in tracking and attribution — including work with Digital Recipe, Conversio, Debutify, Quick Evolve, and Bytes 2 Insights. "He always provides detailed explanations and delivers great results. Now our tracking is fixed." — Matthew H., Account Manager, Quick Evolve "Chowdhury is a professional in his field, very diligent and communicates clearly." — Stefan S., Marketing Manager, Debutify How I work: I start with a short audit to show you exactly what's broken and what it's costing you before any work begins. Most engagements start there — many clients keep me on for ongoing tracking maintenance and deeper data analysis afterward. If your numbers don't add up, send me a message with what you're seeing — I'll tell you honestly whether it's fixable and what it would take.