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Julien SimonJS

Julien Simon

Python/Java Developer, Data Engineer, AWS

€950/day
Tours, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

I am a freelance software developer with over 10 years of experience, specializing in delivering tailor-made technical solutions that meet my clients' specific needs. I work autonomously and rigorously on complex projects, always focusing on quality, efficiency, and business value. My expertise allows me to quickly understand business and technical challenges to support my clients in their digital transformation by proposing adapted and scalable solutions. I favor close and agile collaboration to ensure that each deliverable perfectly matches expectations and concretely contributes to their objectives. By working with me, my clients benefit from a reliable, versatile, and committed partner capable of tackling technical challenges while bringing strong strategic added value. My approach is centered on their needs to maximize the impact and success of their projects.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • AXA
    Software Developer
    August 2018 - Today (7 years and 10 months)
    Intervention on TEX, Axa's telematics platform that collects data from connected vehicles and calculates driving scores used to offer personalized insurance policies based on monthly driving behavior. Development of new features and bug fixes on the legacy platform. Maintenance and operation of a highly available production environment scaled for over 100,000 connected vehicles. Progressive migration of projects hosted on the legacy infrastructure (EC2) to a fully serverless architecture. Design and development of new cloud-native telematics services in fully serverless.
    Amazon Web Services Python Java
  • Xebia
    Software Developer
    May 2017 - May 2018 (1 year)
    Participation in the development of Galeries Lafayette's Datalab, a platform that centralizes and leverages data from multiple internal and external sources. The project aimed to collect, process, and analyze both batch flows (daily customer database exports, stock, etc.) and real-time flows (web interactions, in-store receipts) to generate actionable insights and optimize marketing actions. Integration and processing of batch data (CSV files) with Spark. Integration and processing of real-time data (web traffic, receipts) via Spark Streaming or Kafka Streams. Implementation of real-time logic for personalized targeting (sending promotional codes based on user behavior). Supervision and monitoring of streaming machines and jobs with Prometheus and Grafana. Industrialization and automation of batch/streaming deployments via Jenkins and Ansible.
  • XEBIA
    Java Developer
    May 2016 - May 2017 (1 year)
    Participation in the development and maintenance of the Eurostar website's back-end, as well as the complete redesign of the price calendar for better performance and maintainability. Automation of functional tests via SOAPUI. Development and integration of SOAP web services. Implementation of new performance and reliability-oriented features. Refactoring of existing code and improvement of software quality. Adoption and dissemination of craftsmanship best practices within the team.

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Education

  • Doctor of Philosophy (Ph.D.) - Chemistry
    Université de Cergy-Pontoise
    2012
  • Computer Analyst - Java JEE
    afcepf
    2013

Skill set (8)

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