01 · DIAGNOSTICWe open your containers before touching anything.
Full audit of what's measuring what : GA4, GTM, third-party tags, current consent banner. By the end of the diagnostic, you know where the signal leaks, what's superfluous, and what's broken without anyone seeing it. Not a blind overhaul. A quantified map.
02 · CONSENT MODEThe legal foundation before the measurement.
Without a properly calibrated Consent Mode V2, everything that follows is legally shaky and technically unstable. We configure the banner, the region-aware default (EEA + UK + CH strict, rest of the world granted), and the load-time update. GDPR-ok, Google-ok. This layer decides what you have the right to measure, not your gut.
03 · TAGGING PLANOne event, one schema, one source.
The plan lists every business event to measure : transaction, lead form, cart add, key scroll. For each : canonical name, parameters, trigger source, linked KPI. Shared document, signed off by you before a single tag. No orphan measurement.
04 · DATA LAYERThe layer that pushes, structured once and for all.
The Data Layer fires events on the browser side, in the format defined by the tagging plan. Versioned implementation, tested page by page. You can switch ad agency or analytics tool, the Data Layer doesn't move. It's the interface, not the tool.
05 · SERVER-SIDEThe browser leaks. The server doesn't.
Server-side GTM intercepts browser events, deduplicates them, enriches them, and pushes them to GA4 and ad platforms. You recover 30 to 50 % of the signal adblockers and Safari ITP had erased. Bonus : fewer third-party scripts loaded on the front, so a lower perf impact.
06 · DASHBOARDOne dashboard, read in 30 seconds.
Cumulative revenue, CAC per channel, ROAS per campaign, threshold alerts. Data Studio or BigQuery depending on your stack. Not 80 pastel widgets : the metric, its trend, the alert if something drifts. Your CFO reads it before coffee.
07 · OWNERSHIPYou pilot without asking us.
Full documentation : Data Layer schemas, commented GTM containers, server-side runbook, separated accesses. Your team or your next ad agency can take over without a forensic audit. We stay on backup as long as you need it. We leave the moment you don't.