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Ousam S.OS

Ousam S.

Data engineer | GCP SQL Python DBT

€500/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Ousam

- Translate complex data into impactful insights
- Build scalable and reliable data pipelines with robust governance
- Empower cross-functional teams with actionable dashboards

Technologies: GCP, BigQuery, SQL, DBT, Looker, Python, PowerBI
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 20km)

Experience

  • BNP Paribas (Nickel)
    Data engineer
    January 2026 - May 2026 (4 months)
    Context: Securing the dbt architecture and redesigning pipelines in the face of critical data mutations.

    Missions:
    - Piloting the impact audit (Shadow Testing) on a massive DAG of +2400 models
    - Deploying backward compatibility strategies via dbt versions and data contracts
    - Structural redesign of the Staging layer and isolation of technical debt

    Results:
    - Zero production incidents during the switch of major schema changes
    - Successful migration and redesign of +200 models
    - Drastic optimization of BigQuery compute time and costs via layer refactoring
    GCP BigQuery SQL Python DBT
    Google Cloud Platform (GCP) Python
  • OPTEAMIS
    Data engineer
    DIGITAL AND IT
    February 2024 - July 2025 (1 year and 5 months)
    Paris, France
    Context: Redesign of the data architecture and automation of business reporting.

    Missions:
    - Autonomous project management & Business interface
    - Migrations OLTP to GCP BigQuery and Cloud Storage
    - Automation of Looker and Google Sheets reports
    - Responsible for GCP infrastructure and model optimization

    Results:
    - Unification of +180 tables into a single source of truth
    - -80% Time-to-Insight via elimination of manual processes
    - New key insights unlocked for the business
    Cloud GCP BigQuery SQL Python DBT
  • Métropole du Grand Paris
    Data engineer
    PUBLIC SECTOR
    September 2021 - December 2023 (2 years and 3 months)
    Paris, France
    Context: Design of data pipelines for the public sector, ensuring the quality of strategic datasets.

    Missions:
    - Piloting the Data Strategy & Alignment of business stakeholders
    - Architecture of a centralized & robust data foundation
    - Industrialization of heterogeneous ingestion flows

    Results:
    - Federation of 10+ business units into a centralized foundation
    - Sustainability of the Data heritage & End of manual processing
    - Adoption of steering tools by Senior Management
    SQL PowerBI Python API PostgreSQL

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Education

  • Bachelor of Science in Engineering Science
    Gustave Eiffel University
    2021
    Bachelor Engineering Sciences

Certifications

Skill set

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