Freelancer profile translated to English.
Back to original languageAbout LoĂŻs
đź‘‹ Hello! I'm LoĂŻs, aReact.js / Next.js developerwith 12 years of experience, specializing in **creating modern and high-performance interfaces**.
đź’ˇ My approach: deepfront-end expertise(React, Next.js, TypeScript) combined withfull-stack mastery(NestJS, Node.js, PostgreSQL) to deliver complete applications, from UI to deployment.
🚀 I have supported critical projects in **nuclear**, **cardiology**, and **fintech**, where reliability and rigor are non-negotiable.
Today, I apply this standard to every mission.
đź’Ž Creator of several SaaS products built from scratch with Next.js 15, React 19, NestJS, and a Clean Architecture / DDD approach.
âś… What I can do for you:
- React.js / Next.js frontend development (SSR, SSG, App Router)
- Creation of SaaS and business applications from scratch
- Refactoring of existing applications to a modern stack
- Development of robust APIs with NestJS / Node.js
- Technical support for your product teams
⚙️ Tech Stack:
- Frontend: React.js, Next.js, TypeScript, TailwindCSS
- Backend: NestJS, Node.js, PostgreSQL, Supabase
- Architecture: Clean Architecture, Domain-Driven Design, CQRS
- Tools: Vercel, Docker, Git
đź“© Available for full remote work, responsive (response < 1h), and autonomous.
Contact me to discuss your project!
French
Native or bilingual
English
Fluent
Spanish
Conversational
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Toulouse (up to 50km), Montpellier (up to 50km)
Experience
- AlliaSenior Fullstack Developer React.js / NestJSSOFTWARE PUBLISHINGNovember 2025 - Today (9 months)Paris, FranceAllia is a startup founded by the former CEO of Mailjet and Regate, specializing in automating tax workflows for accounting firms. I joined the technical team (8 developers) to develop the core product: extraction and processing of tax data.My role:Backend design and development to transform raw tax data into actionable information, using a Domain-Driven Design architecture.Key achievements:
- Integrated the JeDĂ©clare SOAP API to retrieve tax declarations (VAT, Income Tax, Corporate Tax, CVAE) for hundreds of clients
- Developed an EDIFACT parser to extract and structure data from DGFIP files
- Created an automated tax calendar to calculate payment deadlines per company
- Automated processing of email attachments containing declarations
Technical Stack:- Backend: NestJS, Node.js, TypeScript
- Database: PostgreSQL, Supabase, Supabase Vault
- Frontend: Next.js, React.js
- Architecture: Domain-Driven Design
Keywords: NestJS, Next.js, React.js, TypeScript, Node.js, PostgreSQL, Supabase, API, Domain Driven Design, Fullstack, NestJS Developer, Next.js Developer. - KnowFastCreator & Fullstack Developer React.js / Next.jsSOFTWARE PUBLISHINGApril 2025 - October 2025 (6 months)Paris, FranceKnowFast is a B2B SaaS that I designed and developed from scratch, enabling SMEs to create an intelligent document search engine in under 5 minutes.The product:Users upload their documents, ask a question in natural language, and KnowFast instantly finds relevant information among thousands of files with source citation.My role:Product design, technical architecture, and full-stack development. I chose a modern stack and a robust architecture to ensure scalability and maintainability.Technical achievements:
- Frontend development with Next.js 15 and React 19 (App Router, Server Components)
- Implementation of a RAG (Retrieval-Augmented Generation) system for semantic search
- Clean Architecture + Domain-Driven Design + CQRS architecture
- Serverless deployment on Vercel with PostgreSQL database (Neon)
- Integration of AI models for document analysis and indexing
Technical Stack:- Frontend: Next.js 15, React 19, TypeScript, TailwindCSS
- Backend: Node.js, Next.js API Routes
- Database: PostgreSQL (Neon)
- AI: RAG, embeddings, vector search
- Architecture: Clean Architecture, Domain-Driven Design, CQRS
- Deployment: Vercel
Keywords: Next.js, React.js, React, NextJS, TypeScript, PostgreSQL, RAG, Clean Architecture, Domain Driven Design, CQRS, Vercel, SaaS, Next.js Developer, React.js Developer, Fullstack, AI, Artificial Intelligence. - CardioParcSenior Frontend Developer React.js / TypeScriptHEALTH AND WELLNESSJuly 2024 - October 2025 (1 year and 3 months)Saint-Didier-au-Mont-d'Or, FranceCardioParc is a network of innovative cardiology centers modernizing access to care. I joined the technical team to develop the interfaces for their business platform used daily by healthcare professionals.My role:React.js frontend development in close collaboration with the UI/UX team. Transforming mockups into interactive, performant, and accessible interfaces.Key achievements:
- Development of an internal instant messaging module for communication between caregivers
- Creation of a comprehensive medical scheduling system: appointment booking, patient arrival management, practitioner schedules
- Complete refactoring of the frontend architecture to improve maintainability and scalability
- Implementation of a new state management stack: Tanstack Query + Zustand
- Standardization of forms with React Hook Form + Zod (TypeScript validation)
- Improved separation of concerns and component architecture
Technical Stack:- Frontend: React.js, TypeScript, TailwindCSS
- State Management: Tanstack Query, Zustand
- Forms: React Hook Form, Zod
- API: REST
- UI/UX: Collaboration with designers, pixel-perfect integration
Keywords: React.js, React, TypeScript, React.js Developer, Frontend Developer, Frontend, Tanstack Query, Zustand, React Hook Form, Zod, REST API, Front-End Developer, Web Integration, Health, Web Applications.
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Education
- Full-stack Developer422020Formation intensive en développement logiciel. Spécialisation : JavaScript, TypeScript, React, Node.js, Architecture logicielle.