Freelancer profile translated to English.
Back to original languageAbout Timothée
A critical backend is never just code.
It's about business, data, dependencies, production, and often multiple teams relying on it.
When every evolution becomes slower, riskier, or harder to manage, I help product and engineering teams regain a clear trajectory.
I am a freelance Senior Backend Engineer / Tech Lead, with 12 years of experience in business APIs, backend platforms, and critical systems.
I have worked in large corporations, SaaS, and tech SMEs: Believe, La Poste, Ministry of Economy, Crédit Mutuel, Amadeus, Tekyn, INRA.
I primarily intervene to:
- Gradually modernize legacy systems without disrupting existing ones;
- Build or stabilize a central API;
- Secure data flows and event-driven architectures;
- Improve run, observability, and the team's ability to deliver.
On the technical side:
Backend & API — PHP 8, Symfony, API Platform, AsyncAPI, Doctrine, REST, GraphQL, SQL, PHPUnit
Data & Event-Driven — MySQL, PostgreSQL, Kafka, Debezium, CDC, idempotency, DLT
Cloud & Production — GCP, AWS, Kubernetes, Docker, Datadog, CI/CD, ArgoCD
Architecture and Principles — DDD, Hexagonal Architecture, SOLID, TDD, performance and high volumes
I also use AI when it provides concrete benefits for delivery: codebase exploration, scoping, controlled generation, documentation, and assisted review.
Beyond the stack, my value lies in understanding the existing system and, above all, the business, scoping decisions, building cleanly, ensuring production reliability, and leaving the team more autonomous.
I primarily work on long-term assignments as a Senior Backend Engineer / Tech Lead.
Do you have a current or upcoming project?
Send me the context in a few lines, and I'll quickly tell you if my experience matches your needs.
English
Conversational
French
Native or bilingual
Can work on-site
Paris (up to 50km), Montpellier (up to 50km), Nîmes (up to 50km), Lyon (up to 10km)
Experience
- BELIEVESENIOR BACKEND ENGINEER / TECH LEAD FREELANCETECHApril 2024 - July 2026 (2 years and 3 months)Paris, FranceI supported Believe in modernizing a central business repository related to the music catalog, used by several internal teams.The project involved backend, data, and production aspects: building a new reference API, gradually connecting it to the historical system, and ensuring reliable synchronization for high volumes.I primarily contributed to:• Designing and developing the API with Symfony / API Platform;• Modeling the business domain around releases and recordings;• Setting up CDC flows with Debezium and Kafka;• Ensuring reliable event consumption: idempotency, replayability, DLT, error handling;• Improving observability and production diagnostics with Datadog;• Documenting, transferring knowledge, and supporting the team on technical choices.The assignment also led me to work on scoping and architecture topics: service decomposition, architectural trade-offs, handover, and communication between product, engineering, and SRE.In parallel, I structured AI workflows to accelerate certain delivery tasks: supervised generation, specialized agents, human review, documentation, and quality safeguards.Stack: PHP 8, Symfony 7/8, API Platform 4, Doctrine, MySQL, Kafka, Debezium, Symfony Messenger, DDD, Kubernetes, GCP, Datadog, Claude
- TEKYN SASFreelance - PHP / Symfony Lead DeveloperSOFTWARE PUBLISHINGJanuary 2022 - November 2023 (1 year and 11 months)Paris, FranceClient: Tekyn, a committed player in sustainable fashion, offers a collaborative SaaS platform for all players in the textile supply chain.Needs:---------To meet the collaborative needs around the textile supply chain, Tekyn is revamping its legacy application to implement and develop a new API & SaaS platform.For this, Tekyn wishes to strengthen its team of developers and back-end lead developers.Accomplishments:-------------🛠️ Analysis and design of the technical architecture to be implemented. Implementation of processes and tools to improve the quality and speed of product development, phpcs, phpstan, phpunit💻 Development of various business domains (PLM/ERP features), coaching and training on SOLID principles, TDD, good code review practices🛠️ Implementation of test suites (unit, integration, functional) and CI with GitLab in collaboration with the DevOps team.🤝 Lead of the back-end team (4-6 people) in collaboration with the internal lead back-end developer, support in recruitment and technical interviews of developersSkills: PHP 8 · Symfony 6 · Software as a Service (SaaS) · Object-Oriented Programming (OOP) · AWS · GitLab · PHPUnit · Team Leadership · API Development · GraphQL · MySQL
- LA POSTE DSI BSCCFreelance - PHP / Symfony Lead DeveloperPUBLIC SECTORDecember 2019 - December 2021 (2 years)Montpellier, FranceClient: La Poste DSI BSCC, Mail and Parcels Service BranchNeeds:---------Strengthen back-end development teams for the maintenance and modernization of an API centralizing 15 B2B application portals. Leadership of the back-end team and developer training.Accomplishments:-------------🚀 Migration and modernization of the API from Zend Framework 1 to a GraphQL API with Symfony 4 & PHP 7.📈 Performance improvement on processing batches and flows of several hundred million data points, Elasticsearch + Oracle, improvements and refactoring of SQL queries, DB indexes, etc. gains up to +60 to 80% execution speed.🛠️ Analysis and design of a new API project based on a microservices & API Gateway architecture, PHP 7, API Platform🤝 Lead of the back-end team (6 people), mentoring and coaching, development best practices, SOLID principles, unit & functional testing...Skills: Software as a Service (SaaS) · Object-Oriented Programming (OOP) · Symfony 5 · Oracle 12c · Docker · Openshift · Kibana · Elasticsearch · ApiPlatform · PHPUnit · Team Leadership · API Development · GraphQL · MySQL · PHP 7
Recommendations
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Designer and Integrator of Internet / Intranet Systems.IUT Charlemagne Nancy (54)2015Concepteur Intégrateur de Systèmes Internet / Intranet.
- Computer Science DUT special yearIUT Charlemagne Nancy (54)2014DUT informatique année spéciale