Freelancer profile translated to English.
Back to original languageAbout Valentin
Are you the CTO of a B2B SaaS and the technical debt of your MVP is slowing down your deployments?
Do you need to refactor an aging business software without service interruption?
Are you looking for an autonomous profile to implement complex new components?
I'm Valentin, an AI Fullstack Developer, expert in B2B SaaS refactoring and TypeScript architecture, with a hybrid profile of a good communicator and a rigorous technician.
I work on demanding ecosystems to structure them, unblock them, and restore velocity to your teams.
Daily immersed in critical service continuity issues, I notably led the hot refactoring of a B2B SaaS (from Silverlight to a React Monorepo) with zero service loss. More recently, I took over and restructured the complex codebase of an MVP integrating AI to inject a Clean Architecture, without ever blocking the delivery of the business roadmap.
My Offer
🛠 Refactoring & Modernization: I continuously pay down your technical debt. I ensure the progressive refactoring of your legacy, performance optimization, and strict application of Clean Code for evolutions without regressions.
🚀 Autonomy & Delivery: Implementation of complex features and business modules from A to Z. You entrust me with a need, I manage the technical design and development in complete autonomy.
🧩 Architecture & Support: I integrate your tech team to establish cutting-edge standards (strict TypeScript, Hexagonal, DDD, HATEOAS) and isolate your business logic.
My Technical Skills
• Stack: TypeScript (end-to-end), Node.js
• Frontend: React, Next.js
• Backend: NestJS, API REST, HATEOAS (Hal-Forms)
• DB: SQL, NoSQL
• Quality & Ops: Zod, Jest, CI/CD, Monorepo, Documentation
• AI: GitHub Copilot, Gemini, Mistral SDK
An MVP to industrialize, technical debt to clear, or critical new features to deploy? Contact me, I'll respond within the hour!
Spanish
Conversational
French
Native or bilingual
English
Fluent
Can work on-site
Lyon (up to 50km), Nice (up to 50km), Annecy (up to 50km), Nantes (up to 50km), Marseille (up to 50km)
Experience
- NeyliaFullstack DeveloperDIGITAL AND ITDecember 2025 - Today (8 months)Valbonne, FranceContext: Development and launch of Neylia, a SaaS that uses the power of AI to optimize the time of recruiters and business managers in ESNs or recruitment firms.🚀 Technical Impact & Methodology:- Frontend Standards Refactoring: Establishment of a Clean React Architecture (Single Responsibility Principle, Logical/UI Separation via Custom Hooks, Strong Typing). Practices validated by the Lead Dev for progressive generalization to the entire team.- Type Safety & Security: Securing Client/Server communications by implementing Zod. Definition of shared DTO schemas to ensure end-to-end strict typing.- Data Layer: Modeling complex data in MongoDB / Mongoose.💻 Product Achievements:- "From Scratch" Development of the Marketing Module (AI Content Generation, LinkedIn Publishing).- Critical launch support (Deployment, Hotfixes).🛠 Stack:- Back: NestJS, MongoDB (Mongoose), Zod.- Front: React, Next.js, Strict TypeScript, Mantine UI.- Architecture: Turbo Monorepo, CI/CD (Github Actions, Husky).
- Valentin RocherFull-Stack SaaS Design (Next.js / Nest.js)SOFTWARE PUBLISHINGSeptember 2025 - December 2025 (3 months)Design and development of a personal SaaS project to answer a concrete question: "Do you really know how much your car costs you?"My goal is to create a simple and effective tool to track the Total Cost of Ownership (TCO) of a vehicle.I manage this project in complete autonomy, from design to production (planned):Product Vision & Architecture: Defining needs, designing user journeys, and the full-stack architecture.Backend Development: Building a robust API (Nest.js) with secure authentication (JWT, HTTPOnly Cookies) and a database (Supabase).Frontend Development: Creating a modern interface (Next.js / React 19) for data entry and visualization.Quality & Efficiency: Implementing a Monorepo (Turbo, pnpm), data validation (Zod), and a testing strategy (Jest).This project is my demonstration of end-to-end mastery of the Full-Stack TypeScript ecosystem.
- Innovance SolutionsSaaS Refactoring & Ergonomics Specialist (React / TS)SOFTWARE PUBLISHINGAugust 2020 - December 2023 (3 years and 4 months)3+ year mission: Strategic refactoring of a business SaaS (Silverlight → React/TS migration) and construction of a scalable frontend architecture.4 major challenges met:🎯 1. Strategic Migration (Silverlight → React)- Problem: End-of-life SaaS (IE support ending), threatening service continuity.- Action: Co-piloted the refactoring (5 modules) by rethinking the entire user experience (UX/UI).- Impact: ✅ 100% of the SaaS migrated (by 2 devs in 3 years) before the deadline. 0% service loss.⚙️ 2. Frontend Architecture & UX- Problem: Fragmented codebase and choppy UX (e.g., reloading an app for settings).- Action: Designed a modular architecture to "inject" features dynamically.- Impact: ✅ UX friction reduced. Development time reduced from several days to a few hours.📈 3. Reliability & Testing Culture- Problem: 0% frontend test coverage, leading to regressions.- Action: Self-taught (Jest, RTL) and implemented integration testing strategy on critical modules.- Impact: ✅ Coverage increased from 0% to +60% on critical packages.🧩 4. Full-Stack Optimization (DDD)- Problem: Duplication of business rules (frontend/backend), heavy maintenance.- Action: Participated in introducing DDD and designing the API (HATEOAS) for a single source of truth (backend).- Impact: ✅ Business logic 100% on the backend. Frontend development drastically reduced.TRANSFERABLE SKILLS- Product & Agile: Jira/Confluence Referent, prioritization, writing User Stories.- Support & Users: L2/L3 Support, SQL investigation, webinars.- Communication: Redesign of the showcase website (React/Gatsby), marketing materials.
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Education
- Web DeveloperOpenclassroomsIntégration de maquettes graphiques en HTML et CSS ; intégration de contenus ; normes d'accessibilité et de référencement du W3C ; compatibilité entre les navigateurs ; respponsivité ; interractivité d'un site web avec JaVascript ; communication entre client et serveur avec JavaScipt et PHP ; organisation et gestion de base de données.
- BACHELOR MARKETING & SALES "ORGANIZATIONAL COMMUNICATIONIcademie2015Marketing stratégique et opérationnel ; Communication stratégique et opérationnelle ; Techniques de vente ; Gestion financière et culture entrepreneuriale ; Marketing digital ; Conduite de projet.