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Jules NastJN

Jules Nast

Tracking Consultant GTM Senior | GTM Server-Side

€700/day
Strasbourg, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jules

Is your marketing data unreliable?
Your conversions aren't reporting, or your ad platforms are receiving inconsistent data?
These tracking issues are common and costly.

I've helped over 200 companies regain reliable and actionable data on their campaigns through Google Tag Manager tracking (client-side or server-side).

🔧 AUDIT & OPTIMIZATION OF YOUR TAGS (GTM / CMP / META CAPI...)
  • Full audit and fixes (conversions, inconsistencies)
  • Installation of advertising services (Meta, TikTok, Google Ads)
  • Integration of CMPs (Axeptio, Didomi) and Consent Mode
  • Creation or redesign of tagging plan + DataLayer
🚀 SERVER-SIDE MIGRATION (GTM + ADDINGWELL*)
  • Client-side to server-side migration via Google Tag Manager
  • Installation of Conversions APIs (Meta, Google, TikTok)
  • Bypassing adblockers and ITPs (CDN, Cookie Restore)
  • GA4 recommendations and compliance
*Winner of the Addingwell Centenarian Trophy 2025 for supporting over 100 clients in their server-side implementation


📊 ADVANCED TRACKING & DATA MARKETING
  • Product profit tracking (Firestore / GCP)
  • Offline conversion matching (webhooks → sGTM → BigQuery)
  • Automatic import of offline conversions (CRM, points of sale) to Google Ads

WHY WORK WITH ME?

As a former Media Buyer, I managed up to €150k/month in multi-channel advertising before specializing in tracking.

Since then, I've become passionate about the technical challenges of marketing. My mission: translate business needs into technical solutions.

If you're looking for an educational, pragmatic, and performance-oriented partner, contact me.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • AKKA
    CRM Conversion Tracking with sGTM
    January 2025 - October 2025 (9 months)
    Paris, France
    The company Akka offers individuals the opportunity to invest in European startups.

    Its business model relies on lead generation through various forms (subscriptions, conferences) followed by qualification and sales by commercial teams.

    🎯 Objective: track leads obtained from different forms and associate them with CRM transactions

    **Solution implemented**: matching CRM transactions with online leads via click ID and user data.

    **Technical details**:
    • Client-side GA4 implementation
    • Addingwell server creation and configuration
    • Implementation of logic to manage multi-country (Spain, Italy, and English-speaking countries)
    • Implementation of dedicated tags for iframe form tracking (Paperform, Calendly)
    • Server-side Conversions API installation (Meta, Google, TikTok)
    • Testing, validation, and verification of correct event transfer

    **Results**:
    • Multi-country management with a data distribution logic to specific ad accounts
    • Tracking of iframe forms
    • CRM offline conversions sent to ad platforms
    Google Tag Manager Google Tag Manager Server-Side Firestore Conversion Tracking Google Analytics 4
  • France Toner
    Server-Side Tracking Migration with GTM
    April 2024 - April 2025 (1 year)
    The company invests several hundred thousand euros annually in advertising (Google, Meta, TikTok).

    However, conversions attributed in the ad platforms were abnormally low, due to ITP (Safari) restrictions and adblockers.

    🎯 Objective: restore tracking reliability and bypass data loss related to browser restrictions and adblockers

    **Solution implemented**: complete migration of tracking to a Server-Side environment using Google Tag Manager Server-Side (sGTM) and Addingwell.

    **Technical details**:
    • Client-side GA4 implementation
    • Addingwell server creation and configuration
    • DataLayer evolution to include e-commerce data (GA4) and user identifiers
    • Server-side Conversions API installation (Meta, Google, TikTok)
    • Implementation of the Axeptio CMP with Consent Wall and Consent Mode v2
    • Testing, validation, and verification of correct event transfer

    **Results**:
    • Improvement of Meta's event quality score (EMQ) for purchases from 4/10 to 9.1/10
    • Increase of +15% in purchase conversions sent to Meta and Google
    • Significantly improved ROAS thanks to better attribution

    This migration allowed France Toner to regain a clear view of the real performance of its campaigns, despite the limitations of client-side tracking.
    Google Tag Manager Server-Side Conversion Optimization Server-side tracking E-commerce tracking Google Analytics 4
  • SPRiNG Collective
    Plan de taggage Custom Shopify Headless
    FASHION AND COSMETICS
    January 2024 - Today (2 years and 7 months)
    La marque SPRiNG vend des consommables du quotidien par abonnement. Suite à une migration de Shopify standard en headless ainsi qu'à la création de tunnels d'abonnement sur-mesure, j'ai défini un nouveau plan de taggage et de DataLayer sur-mesure.

    🎯 Objectif : Adapter le plan de taggage à un tunnel d'abonnement sur-mesure dans un environnement technique complexe (Shopify Headless)

    Solution mise en place : migration complète du tracking vers un environnement Server-Side après analyse et rédaction de documentations techniques (plan de taggage et datalayer).


    Détails techniques :
    • Audit des tunnels d'abonnement
    • Création d'un plan de taggage
    • Création d'une documentation de DataLayer à destination des équipes techniques
    • Implémentation du plan de taggage dans GTM client-side avec la création des tags, variables et triggers
    • Création et configuration du serveur Addingwell
    • Installation de l'ensemble des services utilisés côté serveur (Meta, Google, Pinterest, Snapchat, TikTok, Affilae)

    Résultats :
    • Contournement des adblockers et des ITP
    • Tracking sur-mesure des tunnels d'abonnement et de deux marques SPRiNG et Beaudy

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Education

  • Specialized Master® in Digital Marketing
    European Communication School
    2018

Skill set (26)

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