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Mathys RosseMR

Mathys Rosse

Supermalter

Analytics Engineer DBT | Reporting & Data pipeline

€450/day
3 projects
Paris, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Mathys

I am an Analytics Engineer and I support companies in structuring and automating their data chain for business management.
I ensure the automated transformation of raw data into decision-making databases and business dashboards, while guiding their exploitation to generate value.
My priority is the delivery of reliable, documented, and tested tools, allowing for control over data and avoiding technical debt.

Analytics Engineering

My expertise covers the entire data lifecycle:

  • Extraction and integration of data from various sources (APIs, SQL/NoSQL databases, data warehouses like Snowflake, data lakes, or data marts)
  • Cleaning and preprocessing of stored data (SQL, Python) via Extract, Transform, Load (ETL) and/or Extract, Load, Transform (ELT)
  • Data modeling with DBT + Jinja (creation of data marts or classic models) for structuring and maintaining aggregation tables
  • Data quality monitoring (SLI, SLO, SLA) and quality testing via DBT
  • Database (DB) documentation via Collibra or DBT
  • Data pipeline orchestration with Airflow
  • Data restitution and provision
  • Data model design, metric calculation, creation of interactive dashboards (Power BI, Looker Studio)
  • Collaboration with Data Engineering and BI teams to ensure the reliability and efficiency of analytical infrastructures
  • Organization and deployment of solutions in a cloud ecosystem, particularly Azure,
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • DATABIRD
    Malt logoOn Malt
    Analytics Engineering Trainer
    EDUCATION AND E-LEARNING
    February 2026 - April 2026 (2 months)
    Coaching and training of classes of about fifteen students on an Analytics Engineering path, with the goal of progressively improving their skills across an entire data workflow (from ingestion to visualization).
    Leading sessions, explaining technical concepts, correcting exercises, and providing individual follow-up to learners to ensure their progress and autonomy on practical cases.

    Topics covered during the training:
    • SQL optimization on BigQuery (performance, costs, clustering & partitioning)
    • Setting up ETL/ELT pipelines (Fivetran, Airbyte)
    • Data modeling with dbt (medallion architecture, tests, documentation, materialization)
    • Production of structured datasets for BI (KPIs, dashboards)
    • Implementation of Git & CI/CD workflows
    • Orchestration with Airflow and deployment via Docker
    DBT Big Query CI/CD Airflow Docker
  • Crédit Agricole Personal Finance & Mobility
    Malt logoOn Malt
    Analytics Engineer
    BANKING AND INSURANCE
    September 2025 - December 2025 (4 months)
    Roubaix, France
    Mission:
    Optimizing traceability and analysis of customer usage on Sofinco's mobile application and web space.

    Main Actions:

    o Design and deployment of an interactive dashboard to track user traffic, behavior, and key actions. (Power Bi - DAX)

    o Automation of data extraction and processing from the Snowflake data warehouse (dbt data engineering, sql, python, airflow)

    o Implementation of a user action tagging plan and data reconciliation.

    o Collaboration with business teams to define needs and prioritize analyses.

    Results:

    o Adoption of the dashboard by several teams to drive performance and marketing campaigns.

    o Significant reduction in time spent on manual reports.

    o Improvement in data quality and traceability, facilitating user journey analysis.
    DBT SQL Python Airflow Microsoft Power BI
  • Crédit Agricole PFM
    Analytics Engineer
    BANKING AND INSURANCE
    September 2024 - Today (1 year and 9 months)
    Roubaix, France
    Mission:
    Optimizing traceability and analysis of customer usage on Sofinco's mobile application and web space.

    Main Actions:

    o Design and deployment of an interactive dashboard to track user traffic, behavior, and key actions.

    o Automation of data extraction and processing from the Snowflake data warehouse

    o Implementation of a user action tagging plan and data reconciliation.

    o Collaboration with business teams to define needs and prioritize analyses.

    Results:

    o Adoption of the dashboard by several teams to drive performance and marketing campaigns.

    o Significant reduction in time spent on manual reports.

    o Improvement in data quality and traceability, facilitating user journey analysis.
    DBT SQL Python Airflow Microsoft Power BI

Reviews

5.0

Out of 1 rating

C

Camille

Data Analytics Engineer - Crédit Agricole Personal Finance & Mobility

Several months project

-

Reviewed on 1/6/2026

Mathys assisted us for 4 months, mainly on a project to develop dashboards in Power BI (data prep, dataviz...). It was a real pleasure to collaborate with Mathys, who is proactive, autonomous, and attentive to business needs. I recommend Mathys for your current or future needs.

Recommendations

AM
Clément BonduelleCB
MJ
Alexandre Miny De Tornaco and 2 other people have recommended Mathys

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Education

  • Master of Econometrics
    University of Lille
    2025
    Cette formation permet de traiter la majorité des problématiques statistiques rencontrées dans le monde de l’analyse des données socio-économiques. o Économétrie : Approfondissement des techniques économétriques (modèles de comptage, modèles de sélection, modèles de censure, régressions...), gestion de l’hétéroscédasticité, de l’autocorrélation, de l'endogénéité et réalisation de tests statistiques. o Analyse de Données : Manipulation et nettoyage de bases de données massives, gestion des valeurs nulles et traitement de données variées. Projets pratiques sur des thématiques comme les accidents à NYC, la sécurité alimentaire au Mali, ou encore le marché immobilier du Doubs. o Machine Learning : Utilisation des K-means, KNN, Random Forest, Boosting, SVM pour des projets de prédiction et de scoring (détection de défauts de paiement), ainsi que de prévisions de séries financières (modèles ARCH, GARCH, ARMA). Utilisation du NLP pour l’analyse textuelle et aux bases du deep learning.
  • Data Upskilling Program - Benjamin Dubreu
    Self-taught
    2025
    Le programme Data Upskilling de Benjamin Dubreu m’a permis de renforcer mes compétences sur la 'modern data stack'. J’ai travaillé sur des notions telles que SQL, Python (et POO) et le terminal Linux/Bash, tout en créant des APIs et des mini-sites web entièrement depuis zéro. J’ai également approfondi ma compréhension d’Apache Spark et mis en pratique mes acquis sur Databricks Community Edition pour le traitement distribué des données, tout en apprenant à orchestrer des codes et workflows avec Airflow. Enfin, j’ai pratiqué la gestion de code avec Git à travers des projets concrets, développant ainsi ma capacité à collaborer et à maîtriser le versioning.

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