Freelancer profile translated to English.
Back to original languageAbout Julien
With 13 years of experience on various projects, I work as a freelancer to transform complex systems into robust, high-performance, and scalable platforms.
My expertise:
- Backend: Java, Spring Boot, Quarkus, PostgreSQL, Kafka, RabbitMQ
- Frontend: Angular, Vue.js
- Software quality: Clean code, automated tests
- DevOps: CI/CD Pipelines, Infra as Code (Kubernetes/Helm, Ansible)
My interventions:
- Development of greenfield applications with solid foundations under time constraints
- Modernization of legacy applications
- Implementation of a DevOps dynamic to automate and make deployments more reliable (1 day => 15 min)
- Skills development of teams, mentoring on good practices & Code Reviews
- Productivity tools: Pre-configured Docker containers, Slack bot for Git Flow release, offline password manager, monitoring dashboards, update of onboarding processes, ...
Why work with me:
- I know how to combine technical expertise, pragmatism, and autonomy to deliver quickly and well
- I adapt to complex contexts (legacy, deadline, security) without sacrificing quality
- I take to heart the transmission and continuous improvement of team practices
Want a reliable tech partner to transform your ideas or overhaul your IS?
Contact me!
English
Native or bilingual
French
Native or bilingual
Can work on-site
Paris (up to 30km)
Experience
- e.SNCFTechnical LeadTRANSPORTATIONApril 2024 - June 2025 (1 year and 2 months)Saint-Denis, France🏗️ Leading a redesign of a strategic tool for managing the group's local taxes (stations, rail tracks, businesses, ...) with the following objectives:- 💰 Save several million in missed claims and maintenance of the old system- 🧾 Allocation of payments to the group's sub-entities- 📉 Recover several man-months of work per year for users🛠️ Implementation of a clean, maintainable, and secure code base:- 🧪 90% test coverage and Sonar Quality Gate continuously respected- 🦟 Very few demo effects and application bugs- 🛡️ Connection to an internal OIDC provider under time constraints🚀 Key actions taken to guarantee the success of the project:- 👨🏫 Skills development of 4 junior developers via code reviews and practical workshops- 🏁 Facilitation of the V1 production release before the winter freeze- 🔄 Automatic import of tax data for operational continuity with the legacy application
- IDEMIASenior Java backend developerSOFTWARE PUBLISHINGMay 2023 - April 2024 (11 months)Courbevoie, France📱 Project to dematerialize American driver's licenses in an Android wallet⚙️ Intervention on the backend for registering a user's driver's license:- Validation of the integrity of the calling mobile- Delivery of a dematerialized and secure driver's license payload in the user's wallet- Contextualization of logs from different services- Batch verification of non-revocations of root certificates- Maintenance of acceptance tests with Serenity & Cucumber- Scripting of E2E test scenarios with Bruno
- TeammeterSenior Java/VueJS full-stack developerSOFTWARE PUBLISHINGJanuary 2023 - May 2023 (4 months)👥 Intervention on a product for managing agile teams (skills matrix, certification management, team health-checks, retrospective, ...)⚠️ Legacy application, 0 test coverage with strong pressure on the delivery of new features🚀 Actions taken- 🛠️ Development of new features on a more stable base- 🧪 Progressive code coverage on the legacy- 👨🏫 Mentoring of 2 junior developers (code review, problem analysis)- 🤖 Bootstrap of the CI, with deployments on dedicated environments per developer- 📈 Versioning of DB migrations to make production releases more reliable at the historical client
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Education
- EngineerESIEE2009