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Rayane SzczepanowskiRS

Rayane Szczepanowski

Data Engineer & BI | Azure Databricks | MS Fabric

€700/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Rayane

Data / BI Engineer, I design, maintain, and evolve data platforms by supporting the migration of On-Premise architectures to the Cloud.

I work on the end-to-end data chain: ingestion, transformation, and data valorization, using modern Cloud solutions to ensure performance, scalability, and reliability.

In close collaboration with business teams, I design usage and value-oriented decision-making dashboards, in an agile approach driven by a culture of continuous improvement.
  • French

    Native or bilingual

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

Experience

  • SNCF
    Data Engineer
    TRANSPORTATION
    June 2025 - Today (1 year and 2 months)
    Lyon, France
    • - Implementation of the medallion architecture
    • - Implementation of Unity Catalog
    • - Cluster cost optimization
    • - Provision of detailed reports on the IT infrastructure status (printers, PCs, virtual machines, etc.).
    • - Monitoring, analysis, and synthesis of park-related data to optimize maintenance and asset management.
    • - Automation of data collection and processing to provide reliable and up-to-date dashboards.
    • - Optimization of scheduling, reducing costs and processing times by 4 hours.
    Migration of an On-Premise architecture to Cloud:
    • - Migration of SSIS flows to Azure Data Factory (ADF)
    • - Development of pipelines in Azure Data Factory, depositing data in Parquet format in Azure Blob Storage.
    • - Implementation of a medallion Delta Lake architecture (Bronze, Silver, Gold, Platinum) for data management and transformation.
    • - Development of Databricks Notebooks to load and transform data between the different layers of the Datalake.
    • - Monitoring of double RUNs (parallel executions) pending the decommissioning of the old On-Premise architecture.
    • - Creation of reports on Power BI
    • - Development of SSIS flows with CDATA connectors (API)
    • - POC of existing uses on Microsoft Fabric and Databricks
    Technical Stack: SQL Server, SSIS, Power BI, Databricks, Azure Data Factory (ADF), Azure Blob Storage, Parquet, CDATA Connectors, Python, Azure.
    Microsoft Azure Azure Databricks Databricks Microsoft Power BI Azure Data Factory
  • Cegid
    Data/BI Engineer
    SOFTWARE PUBLISHING
    October 2023 - June 2025 (1 year and 8 months)
    Lyon, France
    Migration of an On-Premise architecture to Cloud:
    - Migration of SSIS flows to Azure Data Factory (ADF)
    - Development of pipelines in Azure Data Factory, depositing data in Parquet format in Azure Blob Storage.
    - Implementation of a medallion Delta Lake architecture (Bronze, Silver, Gold, Platinum) for data management and transformation.
    - Development of Databricks Notebooks to load and transform data between the different layers of the Datalake.
    - Monitoring of double RUNs (parallel executions) pending the decommissioning of the old On-Premise architecture.
    - Creation of reports on Power BI
    - Development of SSIS flows with CDATA connectors (API)
    - POC of existing uses on Microsoft Fabric and Databricks
    Technical Stack: SQL Server, SSIS, Power BI, Databricks, Azure Data Factory (ADF), Azure Blob Storage, Parquet, CDATA Connectors, Python, Azure.
    Microsoft Azure Azure Data Factory Microsoft Power BI SQL Server Databricks
  • Orange
    Data/BI Engineer
    TECH
    September 2022 - September 2023 (1 year)
    Lyon, France
    • • Coaching the team to improve their skills on the MSBI suite
    • • Development of a system architecture (active/active) based on GTM and Load Balancing to host the Power BI report, allowing access for 5000 users. This solution was designed to anticipate any potential failure.
    • • Design of a Power BI Dashboard providing an overview of different communication parks, such as mobile, voice, and data, enabling analysis of consumption, billing, revenue, and park details.
    • • Design of a monitoring dashboard to track report usage.
    • • Design of tabular cubes and development of reports in Power BI.
    • • Integration of ODBC connection to import data from HIVE via SSIS.
    • • Development and automation of data loading flows (SSIS)
    • • Optimization of SQL processes and existing data loading flows.
    • • Incremental data integration with automated partition management on SQL Server.
    • • Optimization of cube processing (incremental) and automated partition management.
    • • Gathering business requirements.
    • • Testing/Production deployment.
    Microsoft Power BI MSBI SSAS SQL Server SSIS

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Education

  • Master 2 (M2): Technical Architect in Computer Science, Computer Engineering
    INSTA
    2022
    Master 2 (M2) : Architecte technique en informatique, Ingénierie informatique

Skill set

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