mhdata.

Independent consultant

Marc-Henri Delugeau

Digital Analytics Consultant
GTM & server-side tracking

I design and improve your data collection: web and server-side GTM, GA4, Piano Analytics, through to BigQuery pipelines. I work with your tech, marketing and data teams across multi-site and multi-brand ecosystems.

Marc-Henri Delugeau
  • L’Oréal
  • Compagnie des Alpes
  • SNCF
  • Accor
  • Cartier
  • Believe
  • DIFCAM
  • Repetto
  • OMNES Education
  • Garnier
  • Yooz

How I can help

Your measurement setup should be useful, understandable and maintainable. Here is how I help you build it and keep it working as your needs evolve.

Get clarity on your tracking

Unused tags, duplicate events, missing data: I trace discrepancies back to their source in GTM and across your user journeys. The audit separates what works, what needs fixing and what can be simplified, with clear priorities for the next steps.

Give your data collection a clear structure

I start with your analysis needs to define what to measure, where and with which data. Those decisions become a tracking plan, dataLayer specifications and GTM rules that developers can implement and your teams can maintain.

Make your journeys measurable in GA4

Whether you are starting with GA4, migrating or improving an existing setup, I connect website interactions to the metrics you use. I check events, parameters and conversions so reports reflect the journeys people actually take.

Take control of server-side data flows

I set up the server layer between your website and your analytics or advertising tools. Using server-side GTM on Addingwell, Stape or Google Cloud, you can decide what data to share, with whom and under which conditions. I handle deployment and testing.

Make user choices drive tag behavior

A choice made in the consent banner should carry through to the tracking. I coordinate your CMP, GTM and Consent Mode v2, then check how they behave throughout navigation, including when someone changes their consent decision.

Send the right signals to ad platforms

I connect meaningful business actions to advertising platforms: purchases, leads and other relevant conversions. Across pixels, Meta CAPI, Google Ads and TikTok, I check event delivery and deduplication so campaigns receive consistent signals.

01 /Recent projects

Independent consultant · Analytics & Data EngineeringSince February 2020

SNCF · Transilien

Analytics 360 → Piano Analytics migration.

Believe

Complete GTM and GA4 redesign with OneTrust consent integration.

L’Oréal · Garnier

Lead web analyst: implementation, reporting and dashboards.

Other projects

Tracking specifications, GTM audits, server-side collection on Cloud Run, consent and reporting.

02 /My career

2018–2020Compagnie des Alpes

Compagnie des Alpes

Digital Analytics Lead

Analytics lead supporting leisure park teams.

  • Rolled out GTM and Universal Analytics across websites and booking funnels. Defined tracking plans and dataLayer specifications, and coordinated QA with agencies and ticketing vendors.
  • Deployed Campaign Manager 360, Search Ads 360 and Floodlight; delivered performance analysis and supported marketing teams.
2016–2018Accor

Accor

Digital Analytics Consultant

Analytics implementation across the group’s digital ecosystem.

  • Deployed GTM and migrated AT Internet to Google Analytics 360. Managed marketing tags and delivered business analysis.
  • Trained 100+ e-commerce team members on Google Analytics 360.
2013–2015Cartier International

Cartier International

Digital Analytics Consultant

18 markets, including 7 e-commerce markets.

  • Owned end-to-end analytics implementation: specifications, QA and maintenance across localized websites and devices.
  • Migrated IBM Coremetrics to Google Analytics, defined KPIs and trained local markets. Delivered conversion analysis and A/B tests.

03 /Expertise & tools

Collection & architecture

Tracking plans, dataLayer design, SPA tracking, master templates and GTM API deployments.

GTM web & server-sideAddingwellStapeJavaScript

Analytics & measurement

Analytics migrations, KPI frameworks, performance analysis and attribution diagnostics.

GA4Piano AnalyticsAnalytics 360

Pipelines & cloud

Data consolidation, SQL modeling and automated data extraction.

BigQuerySnowflakePythonCloud RunGCS

Consent & media

Consent orchestration, conversion APIs and first-party collection.

DidomiOneTrustAxeptioConsent Mode v2Meta CAPI

Quality & governance

Container audits, deduplication, QA and measurement documentation.

Charles ProxyOmnibugTestingBot

Reporting & collaboration

Dashboards, steering committees, training and coordination across agencies and business teams.

Looker StudioPower BIJiraConfluence

Let’s talk

A measurement or
data collection project?

Available remotely, on-site or in a hybrid setup, depending on your project’s needs.

Book a meeting

Open in Google Calendar ↗