Freelancer profile translated to English.
Back to original languageAbout Hussam
Looking for aJava backend developercapable of delivering in production without breaking existing systems and slowing down your teams?
I design and evolve backend applications inJava 21andSpring Boot**, from **REST APIsto **microservices architectures**, with a particular focus on production stability and delivery speed.
Here’s what my clients have achieved:
Mirakl(SaaS provider,$8.6 billion GMV**, clients Carrefour, Fnac, Boulanger, Macy's): Developed Java microservices for the service marketplace, **optimized a nightly batch from 2.5 hours to 40 minutesfor the largest client, and **over 100 successful production deployments in 5 years**.
Allianz(€12 billion revenue, 50,000+ brokers and agents):Migrated 120,000 articlesfrom IBM DB2 to SaaS, and designed a Spring Boot 3 microservice bridging modern identities with legacy applications (**over 60,000 calls in 6 months**).
Société Générale / Lyxor ETF**: **Extracted a microservice from a monolithwith complete test coverage, and developed REST APIs for monitoring financial data incidents.
Is your project based on **Java, Spring Boot, PostgreSQL, Kafka**, or a **migration from legacy to a modern stack**? I will structure the technical foundation so that each sprint results in a production delivery, not a list of bugs.
I work with large corporations, scale-ups, and startups in banking, insurance, e-commerce, and the public sector.
Have a project? Click on "Contact" and describe your situation in 3 lines, I will reply the same day.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km), Bordeaux (up to 50km), Lyon (up to 50km), Lille (up to 50km), Nantes (up to 50km)
Experience
- AllianzJava Developer | Spring Boot | MicroserviceBANKING AND INSURANCEFebruary 2024 - February 2026 (2 years)Nanterre, France→ Mission Objective:Modernize the backendJavaapplications used by 50,000+ Allianz brokers and agents: refactor an intranet, improve identity reliability, and integrate with Salesforce and Sailpoint.→ Achievements:Designed and developed a backendJava / Spring Boot 3 microserviceexposing aREST APIthat bridges new nominative identities with legacy applications, with automatic assignment of a historical identity. **Over 60,000 calls in 6 months**.Developed backendJava microservicesfor Salesforce and Sailpoint integration to ensure broker identity reliability and automate the creation of nominative accounts.Technical lead for themigration of 120,000 articlesfrom IBM DB2 to a SaaS solution, reducing legacy infrastructure costs.**Contributed to architecture choices**, code reviews, and guidance for a junior developer, with front-end Angular 20 contributions.→ Technical Stack:Java 17, Spring Boot 3, Angular 20, REST API, PostgreSQL, IBM DB2, Salesforce, Sailpoint, Jenkins, JUnit, Maven
- MiraklJava Developer | Spring Boot | KafkaE-COMMERCEDecember 2018 - December 2023 (5 years and 1 month)16th arrondissement of Paris, Paris, France→ Mission Objective:Evolve the Mirakl service marketplace (GMV €8.6 billion, clients Carrefour, Fnac, BestBuy, Macy's) within a **Java backend scope with high constraints on quality, performance, and production stability**.→ Achievements:Optimized critical SQL queries in a nightly quality control batch:execution time reduced from 2.5 hours to 40 minutesfor the largest client, an average saving of over 60% across all marketplaces.Designed and developed aJava / Spring Bootbackend module for product matching, processing catalogs of over **100,000 products**, deployed to 20 vendors in a pilot phase.Extended the vendor quality control system (deployed on 100+ marketplaces) to the service marketplace via **Kafka**, automating the deactivation of non-compliant vendors.Handled critical production incidents**: analysis, fixes, post-mortems, and targeted **Datadogmonitoring setup.Provided technical support to 4+ developers over 5 years and over 100 successful production deployments.→ Technical Stack:Java 17, Spring Boot 2.7, REST API, PostgreSQL, JOOQ, Apache Kafka, ElasticSearch, React 17, Datadog, Docker, JUnit, Jenkins
- Société GénéraleJava Developer | Spring Boot | MicroservicesBANKING AND INSURANCEJune 2017 - November 2018 (1 year and 5 months)La Défense, France→ Mission Objective:Modernize the backend application architecture of Lyxor ETF (subsidiary of **Société Générale**, European leader in the ETF market), within the Data & Digital department responsible for financial data dissemination.→ Achievements:**Extracted a Spring Boot microservice from a Java monolith**: identified a detachable functional scope, secured with unit and integration tests, deployed without regression.DevelopedREST APIsfor monitoring calculation incidents on daily recalculated financial data (status updates, chart construction).Developed a Java technical libraryshared among several microservices, factoring out common code and accelerating the implementation of new components.→ Technical Stack:Java 8, Spring Framework, Spring Boot, REST API, Microservices, SQL Server, Hibernate, Maven, JUnit
Reviews
Antoine
Développeur Web - COUTREEL ANTOINE
Reviewed on 4/17/2026
Hussam joined as a senior Java / Spring Boot developer on a strategic project. He quickly proposed a clear architecture with a strong focus on code quality and test coverage, without over-engineering. Beyond technical expertise, he knows how to challenge requirements to guide towards pragmatic and sustainable solutions rather than just delivering quickly. Impeccable documentation, tested code, autonomous handover without friction. A reliable profile I recommend without hesitation.
Recommendations
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Education
- Java Expertise MasterclassMoka Technologies2023
- Master of ArchitectureESGI2016Master Architecture des Logiciels, Informatique
Certifications
- Master Software Architecture Computer ScienceESGI2016
- Java Expertise MasterclassMoka Technologies2023