Freelancer profile translated to English.
Back to original languageAbout Yassine
Senior Backend Engineer / Tech Lead — 9 years of experience on critical systems in large enterprise environments (RTE, Enedis, La Poste), within large-scale SAFe programs.
I design, develop, and evolve Java / Spring Boot / Microservices architectures on high-volume and business-critical platforms — 300,000 packages/day at La Poste, 200 million meters at Enedis, national electricity grid simulation at RTE.
Beyond development, I have served as an inter-team technical referent: analyzing complex issues, architectural choices, writing technical user stories, leading multidisciplinary developers. I am comfortable in both a senior dev and Tech Lead role depending on project needs.
AWS certified Solutions Architect Associate — I actively work on AI applied to development: LangChain4j, Spring AI, AI agents, MCP. I use AI tools daily to increase my productivity and that of my team.
Fullstack with a backend focus — Angular and React to facilitate collaboration with front-end teams.
Software Craftsmanship advocate: clean code, TDD, code review, pair/mob programming. I believe well-designed code is a sustainable investment, not a luxury.
Available for freelance missions in IDF — partial remote possible.
Stack: Java 8/11/17/21 · Spring Boot · Kafka · Microservices · Docker · Kubernetes · AWS · Angular · React · GitLab CI/CD · PostgreSQL · Elasticsearch
French
Native or bilingual
English
Fluent
Arabic
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- RTESenior Backend / Inter-team Technical ReferentJuly 2024 - Today (1 year and 11 months)Paris, FranceContext:As part of the modernization of the Imagrid platform (10-year national electricity grid simulation), design and implementation of an orchestration API layer between the new front-end and a complex legacy system, within a multi-team SAFe program.Achievements:
- Analysis of the legacy system's operation and business constraints
- Design of a backend orchestration layer between the new interface and the existing core
- Development and evolution of REST / GraphQL APIs
- Inter-team technical referent (~12 developers):
- legacy backend team (5 developers)- new API / front-end team- Technical guidance on complex issues:
- analysis, impact study, writing technical user stories and specifications- Presentation and explanation of technical topics to the team- Synchronization and technical alignment with the front-end team- Performance analysis and query optimization on the legacy system
- Proposal of solutions minimizing core modifications
- Participation in architectural choices and technical decisions
- Implementation of REST standards, error handling, and best practices
- Code reviews, technical documentation, and cross-team dissemination
- Resolution of cross-functional technical blockers
- Contribution to a progressive and secure migration
Environment:SAFe Agile, Java 8, 11, 17, 21, Spring, REST API, Open API, GraphQL, SSE (Server-Sent Events), Maven, Git, Gitlab CI/CD, Jenkins, Microservices, React, RabbitMQ, Kafka, Oracle, Liquibase, Git Jenkins, Sonar, Testcontainers, Junit, Grafana, ELK, Kubernetes, AWS Cloud, Lambda functions, AWS S3, Agentic AI, Docker, K8S, Linux, AG Grid - Le Groupe La PosteFullstack Developer / Technical ReferentLOGISTICS AND SUPPLY CHAINJuly 2021 - July 2024 (2 years and 11 months)Paris, FranceContext:Within a SAFe Feature Team (PO, QA, UX, SM, 5 devs, transverse DevOps), development of a taxation and pre-security alert platform processing ~300,000 packages/day, in a real-time regulatory context.Achievements:
- Backup Tech Lead — technical leadership of a multinational team
- Code reviews and merges — ensuring code quality before integration
- Design and development of ~30 micro-applications, each composed of micro-services: front-end (Angular), back-end (Spring Boot), consumer/producer (Kafka)
- Initialization and structuring of Spring Boot and Angular projects
- Exposure and security of RESTful APIs (Spring MVC, OpenAPI, OAuth2, JWT)
- Consumption, manipulation, and production of Kafka / Kafka Streams messages
- Deployment and production monitoring (Jenkins, OpenShift, ELK, pods, logs, pipelines)
- Introduction of new tools: MapStruct, Swagger, Parameterized Tests
- XP session facilitation: mob programming, pair programming, coding dojo
- Software Craftsmanship promotion: Clean Code, continuous improvement
Environment:SAFe Agile, Feature team, Java 11, 17, 21, Spring, Angular, Micro-services, Kafka, Kafka streams, Jenkins, Openshift, Docker, Kubernetes, MySQL, Cassandra, Liquibase, Mybatis, Maven, NPM, Git, Junit, Intellij, REST, Mapstruct, Lombok, Open API, SonarQube, JWT, OAuth2.0, Jira, AWS Cloud, Amazon MSK, AWS S3 - EnedisFullstack Developer / Microservices RefactoringENERGY AND UTILITIESJuly 2018 - July 2021 (3 years)Nanterre, FranceIn a SAFe agile framework, I worked on the following three projects:1) Dossier and Case Search - RefactoringSearch across 200 million cases and dossiers with a Full-Text search field and various refinement fields. Search engine built with: a micro-service backend, an Angular frontend, and an Elasticsearch database.2) GCP Migration Batch - From scratchA Spring Batch for migrating data of 200 million meters & cases, from the legacy application to micro-services, handling various complex business cases.3) User Feedback - LibraryI suggested and integrated this idea into all micro-services of the project, establishing a direct link between end-users and development teams through two libraries: Angular frontend and Spring backend.Tasks on the 3 projects:- Participate in technical instruction workshops.- Develop APIs, Java Services, Angular components, and screens.- Set up Elasticsearch index & mapping for search.- Prepare datasets and test scenarios for search with the PO and QA: Three amigos.- Manage Sonar violations, merge requests, code reviews.- Monitor and correct results of GitLab CI/CD pipelines.- Collaborative coding: Code refactoring, Mob programming, Pair programming.- Develop unit, integration, and end-to-end tests.- Design and implement Spring Batch Jobs and Steps, manage Step re-entrancy and workflow, and documentation.- Support batch deployments in production & analyze anomalies and migration issues.- Develop re-entrant PL/SQL BDD scripts for data catch-up and bug fixing.Environment: Agile Scrum, Java 11, Spring, MySQL, Cassandra, Kafka, Git, Maven, Jenkins, Openshift, Docker, Angular, mapstruct, swagger, microservices, BDD, Karma/Jasmine, Junit, Intellij, NPM, RESTful, Tomcat, Weblogic
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Education
- National Engineering Diploma in Computer ScienceNational Engineering Diploma in Computer Science2017
- Preparatory Cycle Math and PhysicsPreparatory Cycle Math and Physics2014