Freelancer profile translated to English.
Back to original languageAbout Jérémy
I help startups and scale-ups build robust and scalable backends (NestJS / Node.js).
I provide quick interventions on architecture, performance, or clean production deployment topics.
Available 2–3 days / month for targeted technical coaching.
What I can do for you:
Structure or refactor a backend (NestJS / Node.js)
Implement clean and scalable architecture
Improve performance (API, DB, infra)
Coach a tech team (code review, best practices)
Assist with proper production deployment
Typical cases:
Early-stage startup with a fragile backend
Team scaling too fast
Need for a punctual senior without hiring
I have worked on several backend projects in startup and agency environments, with various challenges: load scaling, technical structuring, production deployment.
I am comfortable intervening quickly on existing systems to bring clarity and stability.
I prefer short-term missions or regular coaching (2-3 days / month).
If you have a specific need or want to challenge your current backend, don't hesitate to contact me 🙂
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Greenway CareLead NestJs / NextJs DeveloperBANKING AND INSURANCEJanuary 2024 - Today (2 years and 6 months)Paris, FranceAs Lead Developer and CTO's right hand, I lead the design and development of a fintech payment platform built from scratch.The solution enables the issuance and management of Mastercard cards with an advanced authorization engine integrating complex business rules (geographic restrictions, dynamic limits, time constraints, granular user control).🎯 Key Responsibilities• Design of scalable and domain-oriented backend architecture• Integration of critical financial APIs (card issuance, real-time authorization, KYC)• Implementation of a custom business rules engine• Direct collaboration with the CTO and Product Owner on structuring decisions• Coaching and mentoring a team of 5 developers• Establishment of quality standards (TDD, E2E tests, structured code reviews)• Continuous optimization of performance and maintainability🧠 Engineering Excellence & AI• Automation of recurring tasks via AI tools• Acceleration of refactoring and test generation• Optimization of CI/CD workflows• Improvement of team velocity without compromising quality🛠 StackNestJS • TypeORM • PostgreSQLNextJS • TypeScript • TailwindCSSJest (unit, integration, E2E)Domain-Driven Design • Clean Architecture • SCRUM
- Jérémy DutheilFreelance Web DeveloperDIGITAL AND ITMarch 2012 - Today (14 years and 5 months)As a freelance developer, I have worked on several projects for various clients, mainly designing and developing web applications from scratch. My expertise lies in creating scalable and maintainable systems; some project examples include: custom CRMs, rental agreement management platforms, etc.I specialize in NestJs for backend development and NextJs for frontend applications, ensuring a robust architecture and a fluid user experience.
- MobicoopSenior Backend DeveloperTRANSPORTATIONNovember 2022 - December 2022 (1 month)As a senior backend developer, I worked within a team adopting Clean Architecture and a microservices approach. My main contribution was the design and development of an interoperability service, enabling seamless integration between the existing system and a new version of standard specifications.The focus was on code quality, and I helped the team improve their skills in Clean Architecture and Test-Driven Development.Technical Stack: NestJs, TypeORM, PostgreSQL, microservices, clean architecture, TDD
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Education
- Computer Engineering degreeUTC2014