Freelancer profile translated to English.
Back to original languageAbout Vivien
Freelance Fullstack JS Senior — Node.js, NestJS, TypeScript — 10 years of experience.
I design and develop robust backend architectures for high-stakes business platforms:
B2B marketplaces, distributed systems, media processing pipelines, search engines for catalogs of several hundred million products.
My approach: DDD, hexagonal architecture, end-to-end type safety (Kysely, Zod, NestJS), and a comprehensive testing strategy (TDD, BDD Cucumber, real DB integration). I don't deliver code that works — I deliver code that lasts.
Recent missions:
- Media license marketplace — DDD/hexagonal architecture, GraphQL, AWS pipeline (MediaConvert, S3, Cognito), PostgreSQL, 22 business entities
- Connected TV platform — complete refactoring of a Firebase/Serverless backend, getting a critical codebase back on track
- Affiliate widget — Tech Lead, 200M products in DB, CQRS/Event Sourcing micro-services, Kafka, ElasticSearch
Main stack: Node.js, NestJS, TypeScript, PostgreSQL, MongoDB, GraphQL, Docker, AWS, GCP
Based in Arras, available in person in Lille or fully remote.
Available for reinforcement missions, occasional expertise, or part-time — contact me to discuss.
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- BunqerNode.js Backend DeveloperBANKING AND INSURANCEMarch 2025 - Today (1 year and 5 months)Design and development from scratch of the backend for a B2B media license marketplace. DDD + Hexagonal architecture, GraphQL API via NestJS, complete management of the license lifecycle (cart, transaction, claim, payout), payment system (wallets, vIBAN). Media pipeline with AWS MediaConvert, metadata extraction. BDD Cucumber tests on a real PostgreSQL DB. Stack: TypeScript, NestJS, GraphQL, Kysely, PostgreSQL, AWS (S3, Cognito, MediaConvert), Zod, Vitest, Docker.
- OHO LiveFreelance Back JSFebruary 2024 - January 2025 (11 months)Lille, FranceBackend development for the connected reality show “Le Reality Club”. Takeover and refactoring of existing stack within a team of 6 developers.Modular architecture, Firebase cloud functions, Firestore denormalization, best practices (linter, prettier).Stack: TypeScript, Node.js, Firebase, Firestore, GCP, Pub/Sub.
- Groupe CeriseFreelance Tech Lead Back JSSOFTWARE PUBLISHINGMay 2023 - January 2024 (8 months)Tech Lead of a team of 4 backend developers on the refactoring of a product affiliate widget, transformed into a commercial solution. Integration of 200 million products into the database via CQRS/Event Sourcing micro-services. Pair programming, code review, team upskilling on DDD and clean architecture. Stack: TypeScript, NestJS, Kafka, ElasticSearch, PostgreSQL, Docker.
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Education
- Master's in Computer Science: Innovation Computer Project Engineering.Faculty of Management, Economics & Sciences2020Master informatique : Ingénierie de Projet Informatique Innovation.
- RNCP Level II Title - Computer Designer DeveloperEPSI2018Titre RNCP Niveau II - Concepteur Développeur Informatique