Freelancer profile translated to English.
Back to original languageAbout Kévy
Senior fullstack web developer, I am involved in the design, takeover, and evolution of critical web applications, with a strong focus on backend, architecture, and deployment.
I primarily assist companies and product teams facing challenges related to reliability, performance, technical debt, or scaling, by acting as autonomous senior support or taking full responsibility for a technical scope.
My approach is pragmatic and production-oriented: clear architectures, maintainable code, reliable deployments, and long-term evolvability. I place particular importance on production stability and system readability, for both teams and the product.
Key Technical Skills
- Backend: PHP (Symfony, API Platform), Go, Python (FastAPI)
- Frontend: React, Next.js, Angular, TypeScript
- Architecture: DDD, Hexagonal, Microservices, REST APIs
- DevOps & Cloud: Docker, CI/CD (GitLab), AWS, automated deployments
- Data & Performance: Advanced SQL, caching, latency optimization, observability
Types of Missions
- Takeover and modernization of existing projects
- Design of robust APIs and backends
- Architectural redesign and technical debt reduction
- Senior support on complex and structuring projects
Modalities
- Long-term missions preferred
- Full remote (occasional on-site possible – Lille)
French
Native or bilingual
English
Fluent
Can work on-site
Lille (up to 20km), Bruxelles (up to 10km), Paris (up to 20km)
Experience
- ATS studiosFullStack & DevOps Web DeveloperTELECOMMUNICATIONSJanuary 2023 - November 2025 (2 years and 10 months)Lyon, FranceMain missions:- Evolution and improvement of an existing CRM with new business features- Robust backend development with PHP/Symfony and hexagonal architecture- Creation of dynamic Angular/React interfaces with real-time communication- Administration and optimization of SQL Server databases- Implementation of DevOps solutions and CI/CD automationTechnical Projects and Achievements:- Business analysis and design of new CRM features to improve user experience- Secure REST APIs with Symfony and hexagonal architecture to ensure scalability and maintainability- Dynamic Angular/React interfaces with fluid client-server communication- SQL Server administration with performance optimization, security, and data availability- Asynchronous solutions with Symfony Messenger for background task management- Real-time communication via SSE and Mercure protocol for instant update broadcasting- Reinforced authentication system with secure token-based password reset mechanism- Continuous monitoring and maintenance of the application with evolving patches- GitLab CI/CD pipelines with Docker containerization and AWS cloud deploymentBusiness Impact:- Improved operational efficiency through new CRM features- Reduced response times via database optimization and caching- Enriched user experience with modern interfaces and real-time features- Enhanced security for user access and data- Deployment automation reducing errors and production time,
- Orange BusinessPHP/Symfony Backend DeveloperTELECOMMUNICATIONSOctober 2020 - November 2022 (2 years and 1 month)Lyon, FranceInvolved in the design, evolution, and security of critical web platforms for large enterprise clients, in contexts with high demands for availability, security, and performance.I participated in the entire development cycle, with particular responsibility for the backend, application architecture, and system reliability, while collaborating closely with frontend and DevOps teams.Responsibilities and Achievements:• Design and development of highly reliable PHP/Symfony backends for e-commerce and business applications.• Development of secure and scalable REST APIs, integrating advanced authentication and monitoring.• Implementation of modular architectures (DDD, Hexagonal), facilitating testability, maintainability, and application evolution.• Participation in the implementation of CI/CD pipelines, containerization, and DevOps best practices.Projects and Impact:• Completion of several secure payment projects, compliant with industry standards.• Design of several critical REST APIs, used by third-party platforms and front-end applications.• Contribution to the refactoring and modernization of monoliths towards more modular and robust architectures.
- Fondation HopaleSystem and Network AdministratorHEALTH AND WELLNESSOctober 2019 - September 2020 (11 months)62600 Berck, FranceResponsible for the server infrastructure in a critical environment, with high requirements for availability, security, and service continuity.This mission allowed me to develop a strong culture of production, operational maintenance, and risk management, which is now fully integrated into my developer approach.Responsibilities and Achievements:• Administration and optimization of Linux infrastructures (Ubuntu, CentOS) in production.• Implementation of comprehensive monitoring to anticipate incidents and improve system resilience.• Strengthening of environment security: audits, system hardening, access management, and patches.• Automation of recurring tasks to ensure reliability and speed up operations.Impact:• Reduction of incidents by approximately 40% through proactive maintenance and improved monitoring.• Significant improvement in anomaly detection and team responsiveness.• Cloud migration carried out without service interruption, with performance optimization and cost control.
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Education
- Professional title (TP) level 5, Computer ProgrammingStudi2022Titre professionnel (TP) de niveau 5, Programmation informatique
- DUT in Computer ScienceIUT Amiens2014DUT Informatique
Certifications
- Web and Mobile Web Developer - RNCP31114Ministry of Labour2023