Freelancer profile translated to English.
Back to original languageAbout Julien
Senior Power BI Consultant, Microsoft PL-300 certified, 10+ years in major corporations (Dior, VINCI Airports, Tarkett, BPCE, FDJ, Orange). I support business departments and data teams in creating, redesigning, and industrializing their Power BI reporting.
My expertise covers business intelligence modeling (facts/dimensions, star schema), DAX and Power Query performance optimization, KPI reliability, Power BI Service governance, data quality, and data visualization.
I work on demanding large-scale environments, including building reusable BI foundations, redesigning existing models with millions of rows, migrating legacy reporting (BO, SAS, Excel) to Power BI, optimizing DAX/Power Query, implementing Dataflows, deployment pipelines, Power Platform applications (Power BI + Power Apps), and supporting business users.
References: Dior (multi-domain industrial BI, 20+ reports), VINCI Airports (redesign of an international portfolio of 12 reports / 70 airports / 13 countries), Tarkett (model redesign + diffusion industrialization), BPCE, FDJ, Orange.
My typical assignments:
- Redesign of slow or unreliable Power BI reports
- Migration from BO / SAS / Excel to Power BI
- Reliability of KPIs and business calculation rules
- Fact/dimension modeling and model optimization
- DataViz and user experience improvement
- Power BI governance, deployment, and adoption
Objective: to build reliable, fast, maintainable reporting that is actually used by the business.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 20km), Rennes (up to 50km), Nantes (up to 20km)
Experience
- Christian DIORSenior Power BI Consultant — Industrial BI & Cross-functional SteeringLUXURY GOODSSeptember 2024 - June 2026 (1 year and 9 months)Paris, FranceFor Christian Dior Couture, I am supporting the industrial division in structuring a cross-functional Power BI BI foundation to manage production, procurement, logistics, quality, and collection development activities.The mission combines data architecture, M3 ERP business intelligence modeling, Power BI Dataflows, business reporting creation, reference data reliability, and automated alerting setup.The objective is to strengthen trust in industrial indicators, improve the clarity of operational steering, and make data reusable across multiple business domains.
- Industrial Power BI Dataflows Cube
- Fact/dimension modeling on M3 ERP data
- Production, procurement, quality, logistics reporting
- Data quality controls and anomaly detection
- Automated email alerting
- Performance optimization and model maintainability
- TarkettPower BI Redesign — Reliable KPIs, Performant Reports & Industrialized DistributionCIVIL ENGINEERINGFebruary 2024 - June 2024 (4 months)Puteaux, FranceTarkett had an existing Power BI environment with KPI inconsistencies and performance limitations.My mission within the Global Innovation Team consisted of taking over the existing setup, identifying the causes of discrepancies, rebuilding a more robust data model, and industrializing report distribution.What I accomplished:
- KPI audit and analysis of result discrepancies.
- Power BI model redesign to improve reliability and maintainability.
- Migration of the data source from Excel to Power Apps.
- Validation of indicators with business teams.
- Visual redesign of reports using Figma.
- Implementation of a deployment pipeline.
- Creation of a Power BI application with audience management.
- Technical and functional documentation.
Benefits for the client:- Consistent and validated KPIs.
- A more reliable data model.
- More readable reports.
- Better controlled deployment cycle.
- Distribution tailored to different business audiences.
- Vinci AirportsPower BI Optimization — Performance, Data Model & DataVizAVIATION AND AEROSPACEMay 2023 - January 2024 (8 months)Nanterre, FranceVINCI Airports had a portfolio of about a dozen Power BI reports covering an international scope of 70 airports in 13 countries.My mission involved taking over the existing setup to improve performance, simplify the data model, reduce DAX complexity, and modernize the user experience.What I accomplished:
- Data model redesign across 12 Power BI reports.
- Performance optimization on several million rows.
- Removal of complex DAX measures based on SWITCH.
- Moving part of the time logic to Power Query.
- Implementation of Field Parameters to rationalize analyses.
- Creation of Figma templates to standardize reports.
- Complete visual redesign of the report portfolio.
- Creation of an environment report connected to GCP.
- Definition of Scope 1, 2, and 3 KPIs with business teams.
- Creation of a report dedicated to airlines.
Benefits for the client:- Improved navigation and refresh times.
- Simpler models to maintain.
- Leaner and more readable DAX.
- Standardized report portfolio.
- Better adoption thanks to a clearer visual experience.
- Business reporting adapted to an international context.
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Education
- Programme - Membre de la conférence des grandes écoles, Master of Science (MSc) Data ManagementPSB Paris School of Business2018Programme - Membre de la conférence des grandes écoles, Master of Science (MSc) Data Management
- Professional Bachelor's Degree in Data MiningIUT Paris Descartes2016Licence Professionnelle Data Mining