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Ryad Lotfi MahtalRL

Ryad Lotfi Mahtal

Data Engineer

€650/day
Paris, FR
3-7 years

Average response time: 1 hour

About Ryad Lotfi

Data Engineer with 6+ years building scalable data platforms on Azure, GCP, and on-premises. Expert in ETL/ELT pipelines (Spark, Airflow, Databricks), SQL/NoSQL optimization, and CI/CD-driven DataOps. Proven ability to architect full data infrastructures from scratch and deliver end-to-end solutions across retail, smart cities, and autonomous vehicle industries. Complementary background in Machine Learning and Deep Learning bridges the gap between raw data and real business impact.
  • French

    Native or bilingual

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

Experience

  • Worklife (Groupe Crédit Agricole)
    Lead Data Engineer
    BANKING AND INSURANCE
    March 2026 - Today (4 months)
    Paris, France
    • Took ownership of the entire data stack, leading data engineering initiatives end-to-end
    across architecture, orchestration, transformation, deployment, and analytics delivery.
    • Led the full migration of the Data Warehouse from PostgreSQL to ClickHouse, driving the
    project independently from technical assessment and design to implementation and
    production rollout.
    • Evaluated costs, trade-offs, and performance implications of the new architecture, and
    delivered a production-ready platform that reduced dashboard loading time from 5 minutes
    to 5 seconds
    • Re-engineered several critical data workflows to improve reliability and maintainability,
    introducing unit and integration tests across transformation pipelines.
    • Built and industrialized data models with dbt, orchestrated pipelines with Airflow, and
    supported deployment processes in Kubernetes-based environments.
    • Revived the usage reporting project, which had been blocked for 3 years due to reliability
    issues, by defining and executing a robust delivery strategy leveraging ClickHouse
    capabilities.
    SQL Apache Airflow Python (Programming Language) Clickhouse Kubernetes
  • ARISTID Retail Technology
    Data Engineer
    June 2024 - Today (2 years and 1 month)
    Paris, France
    - Designed and built multi-tenant REST APIs (FastAPI/Python) handling bulk data ingestion and search across MongoDB and PostgreSQL for major retail clients (Auchan, Carrefour, Maxeda, BUT)
    - Architected a data pipeline platform from end-to-end with Apache Airflow orchestrating 10+ ETL workflows processing diverse data sources (SFTP, APIs, CloudFlare, SAP)
    - Implemented event-driven architecture using RabbitMQ for real-time asynchronous data processing across multiple client environments
    - Integrated Apache Spark for large-scale data processing, optimizing execution times for high-volume SDO counter computations
    - Built a multi-client CI/CD system on GitLab enabling on-demand per-client deployments with automated credential generation and infrastructure provisioning
    - Developed a monitoring platform for Airflow, APIs, and RabbitMQ with Microsoft Teams alerting
    - Managed database infrastructure: PgBouncer connection pooling, PostgreSQL stored procedures, MongoDB aggregation framework and transactions optimization
    - Containerized all services with Docker and managed environments from development to production
    - Built and maintained an internal Python library (arislib) providing unified connectors for MongoDB, PostgreSQL, S3, Elasticsearch, and SFTP
    - Led international client integrations: Maxeda (Netherlands - Syndigo/SAP), Rona (Canada), and major French retailers
    Python Spark AWS S3 Gitlab CI/CD ETL
  • NHOOD
    Data Engineer
    January 2023 - June 2024 (1 year and 5 months)
    Lille, France
    - Establishment of interface contracts to meet various business requirements;
    - Development of data flows on Azure Data Factory and Azure Databricks to migrate data from +10 subsidiaries worldwide (Luxembourg, Spain, Portugal, etc.).
    - Participation in the implementation of the Agile methodology;
    - Initiation of a git repository on AzureDevops and establishment of best practices for branch and code management;
    - Added CI/CD pipelines in Azure Devops to the project to test, build, and lint each pull request,
    - Data retrieval from multiple sources: Oracle DB, MySql, Web Scraping, etc.
    - Data storage on Azure Data Lake Gen 2 ;
    - Massive data processing using Pyspark and SparkSql on Azure Databricks;
    - Stream scheduling using VTOM ;
    - Code Review ;
    - Handling of production incidents
    Azure DevOps Azure Data Factory Databricks VTOM Python

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Education

  • Master of Science
    Université de Paris
    2022
    Master, Data science
  • Master 2 (M2), Computer vision
    Université Pierre et Marie Curie
    2021
    Master 2 (M2), Computer vision

Skill set

Categories