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Léonard MeyerLM

Léonard Meyer

Senior Backend/Data Engineer

€750/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Léonard

With 9 years of experience in multi-sector companies of all sizes, I can adapt to your environment while supporting existing teams. I am capable of guiding technical choices and supporting teams to convert business needs into value-delivering features.

With a foot in both the data and backend development worlds, using a multitude of languages and paradigms, I have developed a taste for software architecture and complex systems. Thus, in my previous assignments, I have contributed to two major data lakes, migrated monoliths to microservices architectures twice, written and maintained data pipelines, and created a complete technical foundation for development teams.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 30km)

Experience

  • La Poste
    Lead Developer and Data Engineer
    PUBLIC SECTOR
    May 2018 - May 2021 (3 years)
    Issy-les-Moulineaux, France
    Design, implementation, and improvement of existing code, mentoring, software architecture
    - Planning and breakdown of a monolith into Scala microservices
    - Recommendations and training for new developers on Scala best practices
    - Adding features to the data lake based on numerous requests from clients and other departments of La Poste. Work on hot (Kafka) and cold (Spark) flows.
    - As lead, creation of an ETL from scratch for a new data pipeline between two IS, all with Kafka and Scala microservices.
    - Resolution of anomalies after production investigation
    - Creation of a continuous integration and release pipeline with Jenkins, SBT, and Gitlab
    - Creation and contribution to the technical foundation of reusable libraries
    Spark Apache Kafka Scala Airflow sbt Data Lake Git Jenkins Docker HDFS Hive Impala
  • Louis Vuitton
    Data Engineer
    LUXURY GOODS
    May 2021 - Today (5 years and 1 month)
    Paris, France
    Design, implementation, and improvement of existing code, mentoring, software architecture
    - Creation of Scala microservices with ZIO for RESTful APIs so that the business can easily query ElasticSearch
    - Creation of new processing flows with Spark for the data lake. Writing to HDFS or ElasticSearch.
    - Software maintenance of the various existing cold flows
    - Investigation and correction of production bugs (reduction of shuffle and data skew for Spark jobs, correction of queries in microservices, etc...)
    - Creation and contribution to the technical foundation of reusable libraries
    Spark Scala Elasticsearch Data Lake Airflow sbt Docker Swagger
  • Mirakl
    Developer
    SOFTWARE PUBLISHING
    April 2016 - April 2018 (2 years)
    Paris, France
    Developer: Improvement and addition of features concerning the services platform in Mirakl
    - Implementation of an asynchronous image update process for a part of the marketplace with Spring Batch
    - Repair of various bugs such as the display of the rouble symbol on the frontend
    Thymeleaf for Russian clients.
    - Development of service sales in addition to products in Mirakl.
    - Breakdown of a monolith into microservices
    - Implementation of a new part of Mirakl from scratch based on the existing system
    - Implementation of new features with ReactJs, Spring, Jooq, Spring State Machine, etc..
    Java Spring boot Spring React.js Thymeleaf Jooq Docker PostgreSQL Git Maven

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Education

  • Programmer Analyst and Manager Diploma
    Exia CESI
    2014

Certifications

  • OCPJP
    Oracle
    2014
    Java

Skill set

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