Freelancer profile translated to English.
Back to original languageAbout Matthieu
Is your team still managing its projects with Excel and email chains?
As a full-stack developer inTypeScript - React - Node.js**, I design business applications for SMEs, startups, and mid-sized companies looking to **digitalize their processeswithout accumulating technical debt.
14 years as an engineer at Orange Business, working with major CAC 40 clients. Needs analysis, complex project management, interface between sales and technical teams. Freelancing since 2025 with the same approach: **understand the business before coding**.
Among my achievements:
-> **Construction Industry Workshop (BTP)**: Custom business CRM from scratch in Node.js, React, TypeScript - 100 constructions/year on a single platform, 1.5 hours/day saved, 15 field teams connected, government API integration.
-> **HomeRez**: Migration of a critical Angular->React module + complete refactoring of the authentication system (Node.js, Express, TypeScript) on a SaaS platform with 10,000+ properties. 3 parallel mechanisms reduced to 1.
->Orange Business- Major Clients: Margin optimization tool for CAC 40 clients, elimination of parasitic costs, direct improvement of contract profitability.
->Orange Business- IoT: Independent management of a fleet deployment of 1,000+ vehicles, from pre-sales to field deployment.
My full-stack approach:
Frontend: React, TypeScript, JavaScript
Backend: Node.js, Hono, Express, TypeScript, Prisma, PostgreSQL, MongoDB
Tests & Quality: Vitest, Playwright, TDD
DevOps: Docker, GitLab CI
Methodology: TDD, clean architecture, code review, unit and e2e tests, technical documentation.
Do you have a business tool project or a redesign to manage?
I propose a video call to understand your situation and present a concrete approach. Response within 24 hours.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Rouen (up to 50km)
Experience
- Atelier du BatimentFull Stack Developer - Development of a Business CRMCIVIL ENGINEERINGJanuary 2026 - Today (7 months)Paris, FranceDesign and develop a business CRM from scratch to replace a management system based on emails and Excel files for 100 constructions/year. Objective: give back time to the client to focus on serving their own clients, not managing their tools.→ Achievements:
- Complete application architecture (Node.js, React, TypeScript) → maintainable and scalable stack, technical decisions made from A to Z.
- Robust backend (Node.js,Hono, TypeScript, Prisma, PostgreSQL) with Zod validation→ data reliability, zero information loss between sales, designers, and contractors.
- Electronic signature and government API integration → reduced administrative friction, streamlined document validation.
- TDD withVitest(unit and integration tests) andPlaywright(e2e tests),Dockercontainerization → reliable production deployment from the start.
→ Technical Stack:Node.js, Hono, React, TypeScript, PostgreSQL, Prisma, Zod, Vitest, Playwright, Docker, GitResult: 1.5 hours/day saved, 15 field teams and 3 trades on a single platform for 100 constructions/year - HomeRezFull Stack DeveloperHOSPITALITYJuly 2025 - December 2025 (5 months)Paris, FranceAddress the technical debt of a SaaS platform managing over 10,000 rental properties, focusing on critical modules that had been stagnant for several years.→ Achievements:
- Migration of a criticalAngular 1.8module toReact→ 10-year-old code replaced with a modern base, enabling future evolution for the entire team.
- Complete refactoring of the authentication system (Node.js, Express, TypeScript) → 3 to 4 parallel mechanisms reduced to a single implementation, enhanced consistency and security.
- Migration from REST APIs to JSON-RPC and development of a reservation search interface (React) → unified architecture, increased maintainability.
- Automated testing and integration intoGitLab CIpipelines → enhanced coverage, regressions detected before production deployment.
→ Technical Stack:Node.js, Express, TypeScript, React, MongoDB, Docker, GitLab CI, GitResult: Critical module migrated, unified authentication, platform with 10,000+ properties now scalable - ORANGEConnectivity Engineer – Major Clients (Industrial Sector)DIGITAL AND ITFebruary 2017 - November 2024 (7 years and 9 months)La Défense, FranceSupport CAC 40 industrial groups in evolving their connectivity infrastructures and enterprise networks, from needs analysis to contract growth.→ Achievements:
- Development and management of several CAC 40 major accounts → highest organic growth in the industrial agency, long-term loyalty on complex contracts.
- Management of complete pre-sales cycles (needs qualification, tender response, presentations, negotiation) → signing of high-value infrastructure contracts.
- Design of a custom margin optimization tool → identification and elimination of parasitic costs (undisconnected lines, operator arbitrage), direct improvement of contract profitability.
- Interface between sales, technical, and client teams → transformation projects led without roadblocks, accelerated decision-making.
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Education
- Application Designer Developer, Information TechnologyEcole O'clock2025Concepteur Développeur d'Applications, Technologies de l''information
- Engineer, Electronics - Embedded SystemsEcole centrale d'Electronique2012Ingénieur, Electronique - Système embarqué