Freelancer profile translated to English.
Back to original languageAbout Julien
Is your legacy architecture slowing you down? Opaque production?
I specialize in microservices migration and observability (OpenTelemetry, LGTM). After +9 years in major organizations, I can help you to:
✓ Audit your architecture and assess migration risks
✓ Plan and execute the move to microservices (without breaking what works)
✓ Implement observability that truly saves you time
✓ Install the "You build it, you run it" culture in your team
Specialized in Java/Spring, Kubernetes, Docker, PostgreSQL, Kafka.
No parachuting, real teamwork.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- XeliansTech Lead TransverseSOFTWARE PUBLISHINGJanuary 2023 - Today (3 years and 7 months)Paris, FranceXAM Project — Digital & physical archiving solution for large corporations.→ Design of a multi-SAE abstraction library (Vitam/eSafe), decoupling all system microservices from the underlying archiving system→ Implementation of application observability: metrics + distributed tracing (Micrometer, OpenTelemetry)→ Complete refactoring of the HTTP client layer: migration to Spring Cloud OpenFeign + Discovery→ Structured logging strategy (ECS, MDC) deployed across all microservices
- Carrefour DevopsJAVA MicroserviceE-COMMERCENovember 2021 - January 2023 (1 year and 2 months)91300 Massy, FrancePick&Pack Project — Launch of e-commerce (mobile app + back-end).→ Takeover and refactoring of a legacy core (Carrefour Italy): audit, technical debt reduction→ Migration to reactive architecture (WebFlux, Reactor) + Redis cache→ Refactoring of inter-service communication: REST → Kafka (event-driven)→ Implementation of observability: standardized logs, metrics via Micrometer→ CI/CD, quality gates, release management autonomy (You build it, you run it)
- XeliansLead Tech Full Stack (Java/Angular)SOFTWARE PUBLISHINGMarch 2018 - November 2021 (3 years and 8 months)Île-de-France, FranceXAM Project — Development of the digital archiving solution.→ Management of a squad of 4 developers→ Application architecture & security (SSO, certificates)→ Open source contribution to VITAM & VitamUI→ Implementation of best development practices→ Agile transformation support
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Education
- Master 2 (Foundations of Computer Science and Software Engineering), Computer programming, specific applicationsUniversité Paris-Saclay2016Master 2 (Fondements de l'Informatique et Ingénierie du Logiciel), Programmation informatique, applications spécifiques
Certifications
- Oracle Certified Associate, Java SE 8 ProgrammerOracle2017