Freelancer profile translated to English.
Back to original languageAbout Youssef
Lead Java / Spring Boot Developer - 10+ years of experience with critical production systems.
I help CIOs and CTOs to:
- Design scalable and maintainable microservices architectures
- Modernize legacy platforms (legacy Spring Boot -> recent versions, monolith -> microservices)
- Industrialize CI/CD pipelines and software quality
- Secure critical APIs and systems (banking, identity, telecom)
- Technically lead teams (code reviews, mentoring, standards)
Some recent projects:
- IN Groupe - Sovereign Digital Identity Solution (Java 21, Spring Boot 3.5)
- LCH (LSEG) - SWIFT MT to ISO 20022 Migration, CBPR+ compliance
- Société Générale - Banking Document Base Modernization
- Transatel - Telecom Network Activation Asynchronous Workflows
- SNCF - Real-time Train Geolocation
Stack: Java 21, Spring Boot, Spring Cloud, Microservices, REST API, Angular, Kafka, Docker, Kubernetes, PostgreSQL, Keycloak, CI/CD.
Île-de-France (hybrid) or Full Remote
Quick start
Let's discuss your needs.
French
Native or bilingual
English
Fluent
Arabic
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- IN GroupeLead Developer Java / Spring Boot - Sovereign Digital Identity SolutionPUBLIC SECTORNovember 2025 - Today (9 months)Vélizy-Villacoublay, FranceCLIENT:French government agency - production of secure official identity documents (passports, ID cards, State documents).CONTEXT & PROBLEMThe client wants to build a digital identity platform serving as a workflow engine for the production and management of official identity documents, as part of an international export project (national passports).Challenges:
- Strong application security
- Compliance
- Availability
- Production chain automation
SOLUTION PROVIDED- Design and development from scratch of the sitac-adapter component: REST services, data model, validation rules
- Development of identity document stock management screens (tracking, consultation, and inventory update interfaces)
- Technical leadership of the team: code reviews, definition of development standards, mentoring junior developers
- Implementation of the application security strategy: HTTPS configuration, Keycloak integration (authentication, role and permission management)
- Industrialization of the Jenkins CI/CD pipeline: automated build, unit tests, SonarQube analysis, continuous deployment
- Automation and orchestration of multi-environment deployments using Ansible (YAML playbooks) and AWX
- Continuous improvement: bug fixing, functional evolutions, production monitoring
STACKJava 21, Spring Boot 3.5, Spring Security, Angular 19, PostgreSQL,Keycloak, OAuth2, Docker, Kubernetes, Jenkins, Ansible, AWX, SonarQube,REST API, OpenAPI, GitRESULTS- Platform deployed in production on an international project (Colombian Passport)
- Significant reduction in deployment time through Ansible/AWX automation
- High unit test coverage maintained through established standards
- Junior team upskilling on Spring Boot 3 and Java 21
- LCH SASenior Fullstack Developer Java / Angular - SWIFT ISO 20022 MigrationPRIVATE EQUITYNovember 2022 - October 2025 (2 years and 11 months)Paris, FranceCLIENT:LCH (London Stock Exchange Group - LSEG) - European interbank clearing house.CONTEXT & PROBLEMThe CATS treasury system, which handles margin calls to members and interbank payment flows, needed modernization to address 3 challenges:
- Migration of the legacy frontend to a modern stack
- Automation of USD/GBP STP flows to reduce operational risk
- Compliance with the new SWIFT ISO 20022 standard (CBPR+).
SOLUTION PROVIDED- Leadership of the CATS legacy system migration to Angular 13 then 15: definition of the front-end architecture, component structuring, implementation of best practices (RxJS, Lazy Loading, shared modules)
- End-to-end design and implementation of a USD/GBP STP flow for collateral withdrawals: automation of the interbank payment cycle (CMS → CATS → SWIFT MT202 → Euroclear → MT900)
- Migration of SWIFT MT messages (MT202/MT204) to ISO 20022 (PACS.009/PACS.010) within the scope of the CBPR+ regulatory project
- Design and development of the headroom calculation module
- Industrialization of the build and deployment of CATS modules via GitLab CI/CD: compilation, automated tests, packaging
- Implementation of a comprehensive testing strategy: unit tests (JUnit), integration tests, and BDD tests (Cucumber)
- Technical reference for analysis and resolution of critical incidents
STACKJava 8, Spring Boot, Spring MVC, Angular 13/15, RxJS, TypeScript, JUnit, Cucumber, Mockito, Jenkins, GitLab CI/CD, Oracle DB, REST API, SWIFT MT, ISO 20022 (PACS.009/010), GitRESULTS- Significant reduction in operational risk and manual processing through automation of the interbank payment cycle
- CBPR+ regulatory compliance ensured within SWIFT's imposed deadlines
- Significant improvement in code coverage through the BDD strategy
- Reduction in resolution time for critical production incidents
- Société GénéraleSenior Backend Developer Java / Spring Boot - Document Base ModernizationBANKING AND INSURANCENovember 2020 - October 2022 (1 year and 11 months)Fontenay-sous-Bois, FranceCLIENT:Société Générale - French universal bank.CONTEXT & PROBLEMThe bank's document base, used by numerous business applications to manage documentary assets (lifecycle, metadata, security), was based on an aging monolithic architecture (Spring Boot 1.5, Jersey).Challenges:
- Modernize the stack
- Transform the architecture into microservices
- Improve performance and ease maintenance.
SOLUTION PROVIDED- Leadership of the application base modernization: migration from Spring Boot 1.5 to 2.4, replacement of Jersey with Spring MVC, migration to OpenAPI v3
- Active contribution to the transformation towards a microservices architecture: functional decomposition, API contract definition, integration patterns
- Design and development of key features: document lifecycle management, metadata, secure REST APIs
- Implementation of a distributed Hazelcast cache, significantly improving response times for the most solicited APIs
- Configuration and maintenance of Jenkins CI/CD pipelines with automated deployment via Alien4Cloud on an internal cloud environment
- Proactive analysis of production incidents (Kibana logs, monitoring) and optimization of application performance
STACKJava 8, Spring Boot 1.5 → 2.4, Spring MVC, Spring Security, OpenAPI v3, Hazelcast, Jenkins, Alien4Cloud, Kibana, REST API, Hibernate, Oracle DB, Git, MicroservicesRESULTS- Successful migration from Spring Boot 1.5 to 2.4 without service interruption
- Measurable improvement in API response times thanks to Hazelcast caching
- Microservices decomposition facilitating evolutions and maintenance
- Proactive detection of production incidents via Kibana monitoring
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Education
- Master's degree in Computer Science and Information SystemsINSA de Lyon2016
- Engineering degree in Computer ScienceEcole Nationale d'Ingénieurs de Sfax (ENIS)2015