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Slimane El JamiSE

Slimane El Jami

Senior Fullstack Developer | Java | Kotlin | React

€550/day
3 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Slimane

Senior fullstack developer, 12+ years of experience. I integrate quickly into your teams to deliver solid and maintainable features.

My profile: autonomous, rigorous, capable of quickly acquiring new skills on an existing project. I produce clean, tested code, completely autonomously.

With over 12 years of experience as a fullstack developer, I have worked in various environments:
  • Media (ARTE, Institut Français)
  • EdTech (Projet Voltaire, Educ'ARTE)
  • Health / Pharma (Clinigrid, for clients like CERC, SFC)

This diversity allows me to adapt quickly to your work methods, understand your business challenges, and deliver concrete solutions.

I have contributed to the development of various projects:
  • VOD platforms (streaming, payment, catalog)
  • Educational SaaS applications
  • Health data collection tools
  • Legacy system refactoring

My approach: clean, tested, and scalable code. I don't just deliver features; I ensure they remain maintainable over time.

Technical stack: Java, Kotlin, Spring Boot, React, TypeScript, Next.js, Elasticsearch, PostgreSQL, MySQL, Docker, GitLab CI
Practices: Clean Architecture, TDD, DDD, Event Sourcing, CQRS

📍 Based in Montpellier | Occasional travel to Paris possible

Looking to structure your codebase or strengthen your team with a senior developer?Contact me for an initial discussion and to see how I can assist you.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Paris (up to 50km), Paris (up to 30km), Lyon (up to 20km)

Experience

  • Rebaze
    Lead Backend Developer
    September 2025 - February 2026 (5 months)
    Design and development of the backend for a new telemedicine platform (patient-doctor matching, video consultation). Lead backend role on a project from scratch.

    My contributions:
    • Design of the backend architecture in Clean Architecture, oriented towards DDD, event-driven, and CQRS
    • Implementation of a testing strategy (unit and integration) from the project's inception
    • Integration of Keycloak for authentication and access management
    • Integration of Jitsi for patient/doctor video conferencing
    • Integration of Stripe for consultation payments
    • Development assisted by Claude Code (pair programming, testing, refactoring)

    Stack: Kotlin, Spring Boot, PostgreSQL, Keycloak, Jitsi, Stripe
    Kotlin Spring Boot PostgreSQL Keycloak Claude Code
  • ARTE
    Lead Backend Developer
    PRESS AND MEDIA
    December 2022 - September 2025 (2 years and 9 months)
    Successive refactoring of two VOD platforms. Mission obtained following my first successful collaboration directly with ARTE.

    My contributions:
    • Introduction of Clean Architecture and implementation of a testing strategy (unit and integration) on a codebase that was initially untestable
    • Refactoring of Educ'ARTE / ARTE Campus: educational platforms (2000+ videos, cutting, annotation, mind map tools)
    • Refactoring of ARTE Boutique: transactional VOD platform (6000+ programs), integration of payment modules (PayPal, CB)
    • Mentoring a junior developer

    Stack:Java 16 → 19, Spring Boot, Elasticsearch, Kafka
    Java Backend Developer Spring Boot Clean Architecture TDD Lead Developer
  • Projet Voltaire
    Lead Backend Developer
    EDUCATION AND E-LEARNING
    July 2022 - December 2022 (5 months)
    Projet Voltaire is the leading French platform for spelling practice, used by millions of users.
    Participated in the complete refactoring of the legacy application, which had become too complex to maintain.

    My contributions:
    • Development on an Event Sourcing / CQRS architecture to handle a high volume of user interactions
    • Implementation of TDD and DDD practices within the team
    • Technical mentoring of 2 junior developers

    Stack:Kotlin, Spring Boot, Clean Architecture, DDD, TDD
    Kotlin Development Spring Boot Developer TDD Event Sourcing DDD

Reviews

5.0

Out of 3 ratings

AS

Arte Studio

ARTE FRANCE DEVELOPPEMENT

Reviewed on 12/23/2019

3rd mission with Slimane, who has become a sure asset for us!
AS

Arte Studio

ARTE FRANCE DEVELOPPEMENT

Reviewed on 12/13/2019

Second mission with Slimane, the result is once again up to par!

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Education

  • Computer Science, Software Engineering
    Université Laval - Quebec / Canada
    2010
    Interface personne-machine Contrôle de la qualité et métriques du logiciel Bases de données orientées objets Réseaux pour ingénieur Aspects pratique de la sécurité informatique
  • Engineering Diploma
    ESILV - Ecole Supérieure d'Ingénieurs Léonard de Vinci
    2012
    Algorithmique, programmation et conception objet. Technologies Web 2.0, serveurs et services. Réseaux et Bases de données.

Skill set

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