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Youssef Z.YZ

Youssef Z.

Expert Databricks | MS Fabric | Power BI | dbt

€800/day
Paris, FR
8-15 years
Databricks
Microsoft Fabric
Microsoft Power BI
DBT
Data governance

Average response time: 1 hour

Freelancer profile translated to English.
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About Youssef

Expert Data | Azure Databricks · Microsoft Fabric & Power BI · dbt · Data Modeling


I support companies in the design and industrialization of their data platforms, from ingestion to decision-making: robust Lakehouse architectures, reliable pipelines, and high-value-added reporting.

AZURE DATABRICKS
Certified Databricks Data Engineer Associate. Advanced mastery of the Azure Databricks ecosystem: Lakehouse, Delta Lake (ACID, time travel), Spark / PySpark distributed computing, and performance optimization (partitioning, caching, Photon). Design of the Medallion architecture (Bronze / Silver / Gold) and declarative, automated, and reliable pipelines with Delta Live Tables (DLT), including data quality controls. Orchestration via Databricks Workflows, batch and streaming processing. Complete governance with Unity Catalog: data lineage, granular access control, and secure sharing.

MICROSOFT FABRIC & POWER BI
DP-600, DP-700, and DP-300 certified. OneLake architectures, Data Mesh and Medallion strategies, ingestion via Data Factory, Dataflows, and notebooks, high-performance Direct Lake modeling. Design of advanced reports and dashboards, optimized semantic models, DAX mastery. CI/CD and granular security.

MODERN DATA STACK & dbt
Data transformation and modeling with dbt (data build tool), from design to production.

DEVELOPMENT & BI
SQL, Python, M, and KQL for data ingestion, processing, and flow optimization. Visualization also in Google Looker (LookML mastery).
Retail (Small Business)
Consulting and Audits
Luxury Goods
Digital and IT Services
E-commerce

  • English

    Native or bilingual

  • Spanish

    Native or bilingual

Can work on-site
Paris (up to 50km)

Experience

  • Acteur majeur du retail
    Data Expert: Databricks | Ms Fabric | Dbt | Power BI | Data Governance
    RETAIL (SMALL BUSINESS)
    September 2022 - Today (3 years and 9 months)
    Paris, France
    • MISSION 1 — Data Lakehouse Platform (Azure Databricks)

    Architecture & Modeling: Design and implementation of a Medallion architecture (Bronze, Silver, Gold) processing batch and streaming flows (Azure Event Hubs).

    Pipelines & Quality (Delta Live Tables): Design of declarative data pipelines in SQL/Python via DLT, with implementation of Expectations to ensure data quality and automation of batch and streaming flow orchestration. Transformation via notebooks (Python & SQL) and dbt.

    Governance: Deployment of centralized governance with Unity Catalog (Data Masking, Lineage, Fine-Grained Access Control).

    Performance & Costs: Optimization via Liquid Clustering and Serverless SQL Warehouse.

    Industrialization & AI: Complete industrialization via CI/CD (Databricks Asset Bundles and GitHub Actions) and implementation of generative AI (GenAI) use cases.


    MISSION 2 — Modern Data Architecture (Microsoft Fabric)

    Architecture Design: Steering the OneLake ecosystem by designing a modern architecture hybridizing Data Mesh and Medallion principles within the Fabric environment.

    Data Engineering: Orchestration of multi-source ETL pipelines (Databricks, Snowflake, SAP) via Data Factory and Dataflows, transformations via Spark notebooks or dbt, and ingestion into Fabric lakehouses and warehouses.

    Power BI Reporting: Direct Lake semantic modeling and design of complex dashboards with granular security (RLS/OLS).

    DevOps & Adoption: Industrialization of deployments via Git Integration and support for users towards self-service BI.
    Azure Databricks Unity Catalog Microsoft Power BI DBT Microsoft Fabric
  • Bertelsmann
    dbt / Snowflake / Power BI Expert
    LOGISTICS AND SUPPLY CHAIN
    January 2021 - August 2022 (1 year and 7 months)
    Paris, France
    MISSION — Medallion Architecture on Snowflake (dbt) & Power BI Reporting

    Modeling & dbt: Design of a Medallion architecture and dimensional modeling of the data warehouse (star schema, snowflake). Development of dbt models with different materializations (views, tables, incremental, ephemeral) and structuring in staging / intermediate / marts layers. Creation of robust and reusable models via CTEs, Jinja templates, and macros to factorize SQL logic.

    Testing & Documentation: Automation of testing strategies, generation and maintenance of dbt documentation.

    Power BI Reporting — Sales, Merchandising, Supply Chain & Marketing: Gathering and analysis of business needs, drafting functional and technical specifications for reports. Data processing and cleaning with Power Query, then star modeling from Google BigQuery, CRM, Cegid, ERP, and flat files.

    Optimization & DAX: Reduction of dataset size and cardinalities, advanced use of DAX Studio and Tabular Editor. Implementation of DAX measures and aggregations. Design of reports and dashboards for RFM analysis and marketing campaign steering.

    Industrialization & Adoption: Creation of Dataflows and deployment pipelines for centralized maintenance. Publication in the online service (Workspaces + Apps), access management, and user training.
    DBT Snowflake Microsoft Power BI Data Mesh Data Modeling
  • Givenchy & Make up forever
    BI Consultant: POWER BI / BI MODELING / SSAS
    LUXURY GOODS
    July 2019 - December 2020 (1 year and 5 months)
    Paris, France
    Design of 11 strategic decision-making reports + 1 Dashboard on Power BI covering global sales performance, customer segmentation (RFM), and marketing campaign effectiveness.

    Data Engineering (SQL & ETL): Implementation of a hybrid processing chain via MySQL views and complex transformations in Power Query to consolidate data from Salesforce.

    Deployment of Advanced KPIs: Development of a business metrics library in DAX for steering customer loyalty and conversion funnel.

    Governance & Security: Implementation of a granular security architecture (Row-Level Security - RLS) to ensure the confidentiality of customer data by geographical area or department.

    Performance Optimization: Audit and redesign of data models to ensure report fluidity despite transaction volume.
    Microsoft Power BI SQL Server Analysis Services (SSAS) Google Big Query data-integration
Check out Youssef's experience

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Education

  • Computer Engineering
    Ensta
    Ingénieur en informatique
  • Master in Business Administration
    la Sorbonne
    Master en Gestion et administration des entreprises

Certifications

  • Databricks Data Engineer Associate
    Databricks
    2025
    Data engineering on Databricks Unity Catalog
  • DP-600: Microsoft Fabric Analytics Engineer
    Microsoft
    2025
Youssef's certifications are only visible to Malt Community members

Skill set

SQL
data factory
Python
Scala
CI/CD Management
Data integration (ETL, ELT and data warehousing)
Batch Processing
Data Integrity and Governance

Categories