Tracking & Attribution
Fix the data before fixing the ads.
Most performance problems are data problems. Server-side GTM, Meta CAPI, Google Enhanced Conversions, GA4, engineered to recover the 20–40% of conversions that browser-side tracking misses.
The best attribution possible in 2026, built around your business, your sales cycle, and your compliance frameworks. Not a template applied. Bad data is worse than no data: tracking comes first, then the campaigns can scale.
Tracking architecture
01 · Decision Layer
Reports · Bidding signal · Scale confidence
02 · Attribution Layer
Multi-touch · BigQuery · Custom models
03 · Event Layer
CAPI · Enhanced Conversions · GA4
04 · Infrastructure
GTM Server · Cloud Run · First-party data
+20–40% conversions recovered
vs typical browser-only setup
Sound familiar?
- Your Meta ROAS looks fine but you know it's not real
- iOS traffic shows zero conversions in your ad account
- GA4 and Meta disagree by more than 30% on revenue
- You're not sure which campaigns are actually profitable
- Google Ads script or automation based on bad conversion data
- Tracking broke after a site redesign and no one noticed
What I set up
Server-Side GTM Setup
Move tracking off the browser. Bypass ad blockers, iOS restrictions, and cookie limitations. Your data stops disappearing.
Meta Conversions API (CAPI)
Server-side event sending to Meta. Recovers attribution that iOS 14+ killed and improves signal quality for algorithm training.
Google Enhanced Conversions
First-party data hashing that improves Google's conversion matching. Typically lifts reported conversions 15–30%.
GA4 Full Configuration
Proper event taxonomy, custom dimensions, user properties, and conversion setup. Not the default install – actually configured for your business.
Attribution Modeling
Custom attribution models built around your actual sales cycle. Know which channels are actually driving revenue, not just last clicks.
Tracking Audits
Full audit of your existing setup – what's firing, what's duplicated, what's broken. Documented with priority fixes.
Implementation flow
This is infrastructure work, not plugin installation.
Good tracking builds a clean decision system from event design to reporting truth. Cheap setups skip the hard parts, then everyone wonders why Meta, Google, GA4, and the backend all disagree.
Audit the current mess
Check what fires, what duplicates, what vanished after iOS, and which reports are lying to you.
Rebuild the event model
Define clean conversion events, naming, deduplication, identities, and business logic before piping anything server-side.
Deploy server-side stack
GTM Server, CAPI, Enhanced Conversions, GA4, and platform-specific fixes configured around your real funnel.
Verify against reality
Compare platform data, backend truth, and reporting outputs until the system is reliable enough for budget decisions.
Server-side tracking is a compliance decision, not just an attribution one.
Client-side pixels fire from the browser and send data directly to Meta and Google before you can intercept it – product names, health-intent signals, purchase data. For brands in sensitive verticals, that's a legal and reputational risk most agencies don't flag. Server-side tracking gives you full control over the data payload before it leaves your infrastructure. You decide exactly what gets sent.
Healthcare & Medical
HIPAA doesn't technically cover ad pixels, but the FTC has taken enforcement action against health sites sending sensitive data to third-party platforms via client-side tags. Server-side lets you scrub health identifiers before they ever reach Meta or Google.
Supplements & Nutraceuticals
Supplement purchase data is sensitive – someone buying weight loss, hormone, or ED products doesn't expect that data flowing to ad platforms as a health signal. I strip product-level detail from event payloads where appropriate.
ED & Men's Health
Meta flags ED as a sensitive category, which limits audience signals. Properly structured CAPI events – with sensitive fields handled correctly – preserves match quality without triggering policy issues.
CBD & Cannabis
Ad options are limited here, so first-party data infrastructure is non-negotiable. Email and SMS lists, GA4 behavioural data, and compliant attribution become the foundation. I build tracking around channels that actually work.
Advanced attribution
Where standard agency tracking falls apart.
Most setups can count a thank-you page. That is not the same as being able to trust your reporting when the funnel spans platforms, devices, CRMs, regulated payloads, or off-site revenue destinations.
Google + Meta → Amazon
Ad platforms driving traffic to Amazon listings, with attribution stitched back into one reporting layer. Most operators say this is impossible because they only know platform-native reporting.
Offline Revenue Feedback
Lead quality, SQL status, closed revenue, or appointment attendance pushed back into ad platforms so optimisation follows actual business outcomes.
Multi-Touch Attribution
Custom weighting across first click, qualified lead, remarketing touch, and close. Useful when last-click is obviously misrepresenting reality.
Regulated Payload Control
Sensitive verticals need event payload governance, not just attribution. Strip risky fields before they reach ad platforms and keep the useful signal.
What you walk away with
Full documentation of everything that was set up, access to all containers and properties, and a written explanation of what's tracking what and why. You own it – not me.
"Marek was extremely professional, organized, and efficient throughout the project. He quickly identified and resolved a complex tracking issue caused by a poorly executed server-side tracking integration from a previous contractor. His expertise made a big difference, and he handled everything with clarity and precision. I especially appreciate the comprehensive tracking restructuring plan he proposed, it brought real value and helped us see the bigger picture. We will definitely reach out to him again to help execute the plan he designed. I highly recommend working with Marek!"
Islamic-relief · charitable institution · Upwork verified
Engagement options
Three ways to start.
Full Audit
Up to 3 marketing channels in one written report: structure, tracking, attribution, plus an AI opportunity layer. Delivered within 72 hours. €1,500 fixed. Fastest way to find what is broken before rebuilding anything.
See audit options →One-time · From €500Tracking Audit + Plan
Deep written audit with event map, priority fixes, implementation scope, and recommended stack for your business model.
See audit options →Implementation · ScopedFull Tracking Build
End-to-end server-side implementation, validation, and handover documentation. Built to support ad scaling, not just reporting screenshots.
Scope the build →Fix the foundation
Bad data is more expensive than no data.
Every budget decision based on broken tracking compounds the loss. Start with a diagnostic , most accounts I look at are leaking 20–40% of conversions to browser-side restrictions, broken events, or missing attribution. The fix usually pays for itself in 30 days.
Selective by design
I take on a limited number of tracking projects at any time. Server-side architecture done properly takes 1–3 weeks of focused work. Engagements are earned on outcome, attribution measurably better within 30 days, or we stop.
Path 1 · Free
Tracking Diagnostic
90-second diagnostic, Tracking Health Score, top 3 issues, fit assessment. Plus free 30-min call.
Run Free Diagnostic →Path 2 · Paid
Full Audit
Up to 3 marketing channels in one written report: structure, tracking, attribution, plus an AI opportunity layer. Delivered within 72 hours. €1,500 fixed.
See audit options →Path 3 · Direct
Strategy Call
You know you need server-side and want to scope it directly. 30 minutes, no diagnostic required.
Book the call →"I've had the pleasure of working with Marek on several occasions to enhance our tracking capabilities, focusing on platforms like Google Ads, Analytics, GTM, and Facebook Ads. Each time, Marek has consistently delivered outstanding results. His profound knowledge and expertise have directly led to an improvement in our ad performance and ROI. For anyone in need of elevating and improving their online tracking, I can't recommend Marek enough. He's genuinely the real deal!"
Albabostrom · coach · Upwork verified
Or email contact@adpistols.com with your situation.