Freelancer profile translated to English.
Back to original languageAbout Nicolas
Why work with me?
Having officially supportedCommanders Actand then **Tealium**, I spent years debugging complex issues without history or context: a client, an unknown setup, a problem to solve.
Dozens of tickets per day, on very different stacks. This is what forges a real investigation method.
Today, this is what I bring to missions: the ability to take charge ofany setup**, **quicklyidentify what's wrong andfixit.
I also know about **undocumented behaviors**, recurring bugs, and configurations that seem correct but aren't.
I have also developed several Chrome extensions for testing and debugging (Piano Analytics Debugger, Tealium utag Viewer, GTM Server-Side Inspector, Axeptio Inspector), used daily by tracking teams.
What I do concretely:
→ Investigation and correction: why your data isn't reporting, discrepancies between TMS and analytics solution, CMP conflicts, tag duplication, overlapping triggers.
→ Implementation: tag deployment and configuration, dataLayer structuring, tagging plan, deployment on Tealium iQ or Tag Commander.
→ Custom testing tools: Chrome extensions and validation scripts adapted to your stack, to test your pages event by event.
→ GDPR Compliance: Consent Mode v2, CMP integration and debugging (Didomi, Axeptio, OneTrust, TrustCommander), conditional triggers based on consent.
→ Server-side: deployment and debugging on Tealium EventStream, Tag Commander Server Side, Stape, Addingwell, Taggrs, in addition to an existing implementation.
Platforms: Tealium · Commanders Act · GTM · GA4 · Piano Analytics · Adobe Analytics · Matomo · Stape · Addingwell
Sectors: e-commerce · media · retail · insurance · luxury
French
Native or bilingual
English
Fluent
Italian
Conversational
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Annecy (up to 50km), Gex (up to 50km)
Experience
- Groupe industriel internationalTMS Consultant | International Multi-Brand E-commerce MissionE-COMMERCEJune 2026 - Today (2 months)Lyon, FranceScope: deployment, maintenance, and audit of marketing & analytics tags on several international e-commerce sites.Achievements:- Audit of Tag Commander (Commanders Act) containers: architecture, tag obsolescence, dataLayer mapping- Design of conditional tags with internal variables (multilingual mapping, product scoping)- Integration of third-party widgets in SPA environment: targeted DOM injection, MutationObserver, anti-double rendering safeguards- Implementation of retargeting tags with full dataLayer mapping- Audit and cleanup of obsolete tags causing loading errors- Investigation of measurement discrepancies between GA4 and A/B testing solution- Production testing: container override, console & network debugging, tc_vars validationSkills used: Commanders Act (Tag Commander), tagging plan, dataLayer, GA4, vanilla JavaScript, MutationObserver, DOM API, Chrome DevTools debugging, tag audit, multi-country deployment, third-party publisher coordination.
- FreelanceTechnical Tracking Consultant | JavaScript · TMS · CMP · DebugDIGITAL AND ITJune 2025 - Today (1 year and 2 months)Lausanne, SwitzerlandMissions carried out since June 2025 as a freelance consultant specializing in JavaScript tracking and testing tool development:→ **Investigation and correction**: identification of anomalies in tracking implementations, JavaScript, DOM, APIs, server pixels, mobile behaviors (iOS/Android via Xcode & Proxyman)→ **Technical implementation**: custom JavaScript scripts, dataLayer management, tags on SPA applications (React, Vue, Next.js), server integrations in PHP or Node.js→ **Chrome Extensions**: development of testing and debugging tools, Piano Analytics Debugger, Tealium utag Viewer, GTM Server-Side Inspector, Axeptio Inspector→ **GDPR Compliance and Consent Mode v2**: CMP integration (Didomi, Axeptio, OneTrust, TrustCommander), conditional triggers based on consentTools:GTM · Tealium iQ & EventStream · Commanders Act · GA4 · Piano Analytics · Adobe Analytics · Matomo · Stape · AddingwellSectors:e-commerce · banking/finance · media · retail · insurance · luxury
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Education
- Self-TaughtSelf-Taught2019
Certifications
- Commanders ActCommanders Act2019
- Tealium IQTealium2023