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Jonathan HageJH

Jonathan Hage

Senior Backend Java Spring Boot & Microservices

€556/day
Paris, FR
8-15 years

Average response time: 1 hour

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About Jonathan

Java developer with over 10 years of experience in web and e-commerce applications.

I primarily focus on backend development with Spring Boot and REST API design, in contexts where stability, maintainability, and code readability are essential.

Accustomed to long-term projects, I adopt a pragmatic approach to development, with particular attention to code quality and understanding business needs.

Possible interventions:
  • Java / Spring Boot backend development
  • REST API design and evolution
  • Evolutionary maintenance, refactoring, and continuous improvement
  • Technical support for web and e-commerce applications
  • French

    Native or bilingual

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

Experience

  • SFR
    Full Stack Java/Spring & Vue.js Developer on SFR and RED E-commerce Platforms
    TELECOMMUNICATIONS
    April 2019 - Today (7 years and 4 months)
    Paris, France
    I played a key role in the redesign and evolution of customer purchasing and management journeys (fixed & mobile) within a Scrum team.

    🚀 Major Achievements & Impact 🚀

    ✨ Redesign of a Mobile Rental Cancellation Application: I took the initiative and technical lead in completely redesigning a critical application. I designed the process from A to Z and harmonized it with the internal Design System. Result: more maintainable code and clarified customer UX.

    ✨ Optimization through Factorization (DRY): I created a reusable Vue.js plugin (with dedicated Spring endpoints) to centralize dematerialization (scan, signature). This initiative eliminated code duplication across multiple applications, accelerating future development.

    ✨ Increased Reliability of Customer Accounts: Optimized Java/Spring flows for account/customer association. I reduced orphaned accounts (created during abandoned orders), improving data consistency in the IT system and reducing support anomalies.

    ✨ Securing Fiber Optic Connection: Developed a Full Stack feature for entering and validating Optical Network Terminal (ONT) IDs. Result: Significant reduction in field connection errors and rescheduled interventions.

    ✨ Improvement in Logistics/Sales: Integrated an interactive ArcGIS map (Vue.js + Java API) to help technicians and advisors precisely locate residences. Result: Time savings and increased success rate for fiber installations.

    ✨ Increased Reliability of the Purchase Tunnel (Checkout): Developed components in JSP/jQuery/Spring MVC in this critical area. I ensured robust implementation of complex business rules and pixel-perfect integration for SFR/RED visual identities.
    Java Spring Boot Vue.js Spring MVC REST APIs Java 21
  • Hostaven (Side project)
    Full Stack Developer / Lead Dev
    DIGITAL AND IT
    January 2025 - August 2025 (7 months)
    Paris, France
    Development of Konsolid8, a modular platform engineering platform:

    ✨ Backend development in Python on AWS (Lambda, API Gateway, DynamoDB, CloudWatch, IAM).

    ✨ Frontend in Vue.js 3 (CoreUI, dynamic forms & views).

    ✨ AI Integration (AWS Bedrock/Claude) for content generation and visualizations.

    👉 Result: Creation of a tool allowing Ops teams to quickly create custom actions/views and better manage their cloud environments.
    Python Generative AI AWS Lambda DynamoDB Vue.js
  • Eutelsat Group
    Java GWT Developer
    AVIATION AND AEROSPACE
    January 2018 - February 2019 (1 year and 1 month)
    15th arrondissement of Paris, 75015 Paris, France
    Mission: Development of a web application for managing satellite data traffic and configuration. This project is part of a redesign of a client-side software.

    ✨ Implementation of features identical to the previous software
    ✨ Implementation of new features
    ✨ Code review
    ✨ Unit tests
    ✨ Integration tests
    ✨ Scrum methodology
    ✨ Implementation of complex business rules related to the physical and capacity constraints of satellites.
    ✨ Development of critical business calculators, with zero tolerance for error, secured by strict unit tests.
    Java GWT SQL REST Maven

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Education

  • Master 2, Computer Engineering
    Université Paris Sud (Paris XI)
    2013
    Master 2, Ingénierie informatique
  • Bachelor's Degree, Computer Science
    Université Bordeaux I
    2011
    Licence 3, Informatique

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