Freelancer profile translated to English.
Back to original languageAbout Julien
My data projects all have one thing in common: in the end, the teams really use them.
With 4 years of experience in consulting, business analysis, and data engineering, I intervene where data ceases to be a technical subject and becomes a concrete management tool.
What I do concretely:
- Centralization & governance
I lay the foundations: coherent data models, aligned business definitions, a single version of the truth for the entire organization.
- Team autonomy
I build environments where product, ops, and marketing can access their indicators without having to ask a data engineer for every question.
- Transformation & modeling
From raw to deliverable - I design clean, documented, and scalable pipelines, designed to last beyond the mission.
- Business understanding
I have worked in direct contact with SMEs, startups, and scale-ups. I translate business challenges into data logic, even before writing the first line of SQL.
- Skill development
I support teams who want to internalize best practices: model reviews, documentation, data culture.
- What this means for you:
Fewer silos, more decisions based on reliable data. An interlocutor who understands your business as well as your stack.
🧰 Technical environments
- Modeling & transformation: SQL · Python · dbt
- Reporting: Power BI · Looker · Metabase
- Storage: PostgreSQL · BigQuery · Snowflake
- Collection & integration: Python · Airbyte
French
Native or bilingual
English
Fluent
Spanish
Basic
Can work on-site
Paris (up to 50km), Montpellier (up to 50km), Marseille (up to 50km), Lille (up to 50km)
Experience
- TheopAnalytics EngineerMarch 2026 - April 2026 (1 month)Paris, FranceRedesign of the multi-entity billing data pipeline on an Excel/VBA environment:Audit & diagnosis of the existing pipeline:identification of breaking points and inconsistencies in billing flows between entitiesModeling of a centralized data layerto consolidate, validate, and aggregate billing data, a single source of truth for the entire organizationData transformation & structuringvia Power Query (ETL): cleaning, normalization, and orchestration of source flowsAutomation of collection pipelinesand inter-entity consolidation through VBA macro developmentBusiness reporting:design of dynamic dashboards for monitoring billing indicators
- MicrofactoryAnalytics EngineerDecember 2025 - February 2026 (2 months)Paris, FranceImplementation of an end-to-end analytical pipeline for the evaluation and validation of cosmetic products:Data audit & quality:source diagnosis, dataset cleaning, and formalization of a data dictionary to validate the entire pipelineStatistical modeling:design and application of analysis models (ANOVA, mixed models) to produce reliable insights on product performanceTransformation pipeline:Python development of a structured pipeline for collecting, cleaning, and processing raw dataReporting & self-service:development of a Streamlit application allowing business teams to explore results autonomouslySupport & knowledge transfer:training users on tools and analytical best practices
- HETICCorporate & Higher Education TrainerSeptember 2025 - Today (9 months)Training professionals and students in data tools and concepts:- BI dashboard data visualization and design (Power BI, Tableau)- Data analysis with advanced Excel and automation via VBA- Data transformation with Power Query (ETL)- Business Intelligence applied to the music industry (ESED)Teaching data best practices: data structuring, analytical logic, critical interpretation of indicators.
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Education
- Data AnalystOpenClassRooms2024J'ai suivi une formation complète et certifiante en analyse de données, me permettant de développer des compétences clés dans l'exploitation et la visualisation de données. Ce programme m'a permis de maîtriser des outils et technologies tels que Python, SQL, Excel avancé, ainsi que des outils de visualisation comme Tableau/Power BI. J'ai également appris à appliquer des méthodes statistiques et à créer des rapports pertinents pour la prise de décision stratégique. Cette expérience m'a donné une solide base pour résoudre des problématiques data-driven et contribuer à la transformation numérique des entreprises.
- Master in Management and Consulting, Specialization in Innovation, ManagementIAE Gustave Eiffel2023Gestion de projets, Méthode Agile Entrepreuneuriat & Innovation No Code