Freelancer profile translated to English.
Back to original languageAbout Olivier
Freelance Backend Developer | NestJS · Node.js · Typescript · Go
Looking for reliable and responsive backend support?
Need a robust API that can handle the load, an MVP to solidify, or an existing backend to modernize?
I design, develop, and optimize scalable, secure, and maintainable backends.
- Custom Backend Development
- Design and implementation of robust backends with NestJS, Node.js, Typescript, and Go.
- Creation of clean, tested, and documented architectures.
- API Design & Optimization
- Building performant APIs (REST, GraphQL).
- Optimizing existing APIs to improve speed and reliability.
- Refactoring & Modernization of existing backends
- Migration from legacy systems.
- Code refactoring for improved maintainability, security, and scalability.
- Securing & Production Deployment
- Access management, implementation of unit and functional tests.
- Clear technical documentation to ensure project continuity.
- Deployment on your environments (cloud, containers, CI/CD).
- AI-Generated MVP Reliability (Lovable, Bolt, etc.)
- Taking a "quick and dirty" MVP and transforming it into a solid, scalable product.
- Web Application Development
- Custom design
- Front-to-back development
- Third-party API integration
- Backend Training
- Node.js, NestJS, Typescript training, backend development best practices.
For what needs?
- You are launching a digital product and looking to lay solid foundations.
- You have a tech team but need experienced freelance support.
- Your current backend is fragile or poorly documented: you need to stabilize and make it reliable.
- You want to transform a POC MVP into an application ready to host thousands of users.
My added value
- +10 years of experience in backend development.
- Fast and clean delivery
Available for a quick initial chat.
French
Native or bilingual
English
Conversational
Remote only
Primarily works remotely
Experience
- GreenwaySenior Backend DeveloperBANKING AND INSURANCESeptember 2025 - Today (11 months)Nantes, FranceParticipation in brainstorming and architecture redesign to improve the performance of the Node.js NestJs backend.Development of features on the NestJs backend and NextJs frontend.
- LudiksFullstack Web Developer React Next.js GoSOFTWARE PUBLISHINGFebruary 2025 - September 2025 (7 months)Nantes, FranceComplete realization of V1 of Ludiks, a B2B gamification SaaS platform.
- Backend development in Go (Golang) with hexagonal architecture
- Creation of a Typescript SDK and a UI library (React) to facilitate client-side integration
- Web interface in React.js and Next.js
- Infrastructure: API deployed on Scaleway via Docker containers on Scaleway Serverless Containers. React frontend on Vercel
- Implementation of Cloud Functions for automation (Stripe subscription cancellation management)
- JuisciSenior Backend Developer – NestJSHEALTH AND WELLNESSApril 2023 - September 2025 (2 years and 5 months)Stabilization and modernization of a critical API, without blocking the product roadmapTargeted intervention to take control of an unstable codebase while continuing to develop new features.Objectives: restore reliability, improve performance, and establish a healthy technical foundation to support product growth.Major contributions:
- Migration from a complex monolithic architecture to a modular and maintainable backend (Clean Architecture)
- Resolution of performance bottlenecks and critical bugs affecting users
- Implementation of automated anti-regression test coverage
- Close collaboration with product teams to deliver new features
- Structuring the tech team: best practices, coaching, developing autonomy
Impact: improved platform stability, increased tech team productivity, reduced medium-term technical risks.
Reviews
G
Guillaume
Greenway
Reviewed on 9/15/2025
We had the opportunity to collaborate with Olivier on a demanding mission, in a particularly complex and challenging business context.
He quickly distinguished himself by his professionalism and his sharp technical expertise, particularly in NestJS, which he masters perfectly. He integrated effectively into our existing stack, while respecting its constraints and specificities.
Beyond his technical mastery, he demonstrated a great adaptability and a real open-mindedness. Always attentive, he was proactive, offering relevant and pragmatic solutions that significantly advanced the project.
We highly recommend Olivier for any mission requiring a reliable, committed, and results-oriented expert.
Cédric
VingtHuit
Reviewed on 9/20/2024
Olivier was involved in developing features and fixing bugs on our App/Site.
He was proactive in finding the best solutions and successfully completed the mission.
Rigorous and efficient, we like and recommend him.
Recommendations
FU
+3
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Education
- Symfony trainingsensio labs university2018Formation de 6 mois dispensé par sensio labs university (société éditrice du framework Symfony)