Freelancer profile translated to English.
Back to original languageAbout Xavier
Hello 👋,
I am a Java Backend Developer with solid Full-Stack experience, particularly in environments with high technical requirements (ESN, large accounts).
I specialize in Java, Spring Boot, microservices/hexagonal architectures, and event-driven processing (Kafka).
⚙️ Backend
I design and maintain robust, scalable, and secure backend systems:
👉 Java 11 → 21 (Spring Boot 2/3, hexagonal architecture, DDD)
👉 Microservices, secure REST APIs, role & permission management
👉 Apache Kafka / Kafka Connect, event streaming, data pipelines
👉 PostgreSQL, MongoDB, SQL optimization, transactions, migrations
👉 Backend testing (JUnit, Testcontainers, TDD depending on context)
👉 Deployment & CI/CD: AWS, GCP, Terraform, Jenkins, GitlabCI, Docker
I place particular importance on code readability, reliability of data exchange, and performance of distributed services.
🎨 Frontend
I also master modern stacks to effectively work on interfaces:
👉 React.js, Vue.js, Angular
👉 Next.js / Nuxt.js (personal use)
👉 TypeScript, TailwindCSS
👉 Front-end testing: React Testing Library, Vue Testing Library, Cypress
Useful for developing a feature end-to-end or collaborating closely with front-end teams.
🎯 Why work together?
✓ 5 years of experience on critical projects in ESN & large account clients
✓ Solid backend expertise + full-stack capability when needed
✓ Autonomy, clear communication, reliable deliverables
✓ Always learning: personal projects (Next, Nuxt, Nest, etc.)
👯 Need backend, data, microservice, or full-stack expertise?
I am available to discuss your project and see how I can support you.
📩 Contact me!
Spanish
Conversational
English
Fluent
French
Native or bilingual
Portuguese
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- BFORBANKSenior Java Kafka Backend DeveloperBANKING AND INSURANCEAugust 2025 - Today (10 months)Courbevoie, France**Project**: Implementation and maintenance of compliance and regulatory vigilance rules on the B4Bank digital banking platform.Context:Within the 100% digital bank B4Bank, I was part of the team responsible for vigilance, fraud prevention, and regulatory compliance. The objective was to ensure the reliability and legal compliance of customer data within a microservices ecosystem heavily focused on events (Kafka).Achievements:- Implementation and maintenance of all compliance management rules (KYC, fraud, regulatory vigilance).- Setup and optimization of Kafka Connect to synchronize topics with internal databases.- Development of a complete process for automated transcription of data from a Kafka topic to a file usable by the Fraud Department, facilitating compliance commitments.- Transformation and validation of critical data (cleaning, enrichment, formatting) before export.- Contribution to improving overall code quality: code review, standardization, best practices, libraries, test coverage.Technical Stack:Microservices architecture, Java 21, Apache Kafka, Kafka Connect, Spring Boot, PostgreSQL, AWS
- JAX CODEFREELANCE DEVELOPERFebruary 2025 - Today (1 year and 4 months)Aubervilliers, FranceCar Secure:Occasional support for e-commerce website development.
- Pair programming support during the development of new features.
- Analysis of the data model and adaptations to improve the cohesion of different tables.
- Implementation of unit tests.
- Salesforce integration (data synchronization via batch). Development of new front-end features.
- Implementation of a unique payment link system.
Technical Stack:Java 21, Quarkus, Salesforce, Next.js, React, PostgreSQL, PayTweakVillage de Bretou:Reworked the Wordpress website by redesigning the entire showcase site.- Improvement of natural referencing (SEO): Added tags, keywords, loading optimization, external links.
- Implementation of Google Analytics.
- Wordpress integration (content, Google Maps, Elementor components).
- Anti-bot measures for forms using reCAPTCHA.
- Updates of various plugin versions.
Technical Stack:Wordpress, Google Analytics, Elementor - PMUBackend DeveloperENTERTAINMENT AND LEISURESeptember 2024 - February 2025 (5 months)Neuilly-sur-Seine, FranceProject: Implementation of new game servers on a Cloud platform and securing existing ones
- Development of unit tests.
- Creation of game servers.
- Migration of game server rules to the new game servers.
- Implementation of automated purge scripts via the cloud (Terraform/AWS).
- Skill development in new areas (AWS Services, Terraform).
- Updates on various tools through training (Angular 18, React, Vue 3, Java/Spring, Hexagonal Arch, TDD, Typescript, etc.).
Technical Stack:Microservices architecture, Java, Spring, Terraform, AWS, Gitlab, Gitlab CI
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Education
- Master of ScienceSorbonne Université2020Master Sciences et Technologies du Logiciel, Informatique
- Bachelor's Degree, Computer ScienceUniversité Pierre et Marie Curie (Paris VI)2018Licence, Informatique