Freelancer profile translated to English.
Back to original languageAbout Thomas
Welcome to my profile!
Full-Stack Developer since 2021, I handle modern web applications from A to Z: architecture, backend, frontend, third-party integrations, and deployment. I have developed a multi-tenant B2B SaaS platform in production (digitization of HR processes, electronic signature, digital safe).
🚀 I constantly stay updated on TypeScript / Next.js / React and best practices in architecture (multi-tenant, auth, async, self-hosting) to ensure your project remains maintainable over time.
🧑💻 Full-Stack Development 🧑💻
Front-end
TypeScript / JavaScript
React, Next.js (App Router, Server Components)
Tailwind CSS, shadcn/ui, TanStack Query
HTML / CSS, PWA
Back-end
Node.js, Next.js API Routes
PHP / Symfony
PostgreSQL, MySQL
Prisma, Drizzle
Secure REST APIs (JWT), Better Auth
🧑💻 Project Types
Custom SaaS Applications
Multi-tenant Architectures
Third-party Integrations (signature, payment, notifications)
Platform Redesign / Migration
VPS Self-hosting (Dokploy, Docker)
🔧 Main Stack: TypeScript, PHP, Python, Next.js, React, Symfony, PostgreSQL, MySQL, Prisma, Tailwind, Docker, Linux, Git
🎯 My Approach
With 4 years of experience on a production SaaS platform, I bring a pragmatic approach: understand your business needs before the stack, quickly deliver a first usable version, and then iterate while staying close to you.
🌟 Support:
Listening and scoping needs
Appropriate technical proposals
Iterative development with regular demos
Documentation and handover
🔥 Available for your projects
Custom web application, taking over an existing project, technical reinforcement on a modern stack (Next.js / TypeScript) or legacy (Symfony / PHP)?
Don't hesitate to contact me.
French
Native or bilingual
English
Fluent
Can work on-site
Strasbourg (up to 50km)
Experience
- Francetest
On Malt
Expertflow Login Bug ResolutionApril 2026 - April 2026As part of this mission, I worked on a Symfony application experiencing a critical issue during the user login process.My main contribution was to thoroughly audit the existing authentication system to identify the source of the malfunction, while ensuring compatibility with the already in-place SSO. The intervention required a cautious approach, as the login relied on several sensitive mechanisms: Symfony Security configuration, session management, cookies, CSRF, redirects, JWT, and exchanges with the external authentication system.I analyzed the configuration of firewalls, authenticators, providers, access rules, application logs, and behaviors related to cache and server environment. This investigation helped isolate the cause of the problem, restore a functional and reliable login flow, and implement several security adjustments related to authentication.The mission resulted in the resolution of the login blockage, while maintaining SSO compatibility and strengthening the overall robustness of the authentication system. - AppliproFullstack Web DeveloperHUMAN RESOURCESSeptember 2021 - Today (4 years and 9 months)Strasbourg, FranceBackend (Symfony 5)
- Design of secure REST APIs (JWT) for the PWA application.
- Development of business modules: user management, onboarding flows, dynamic forms, notifications.
- Integration of third-party service APIs: electronic signature (Yousign), digital safe (Therefore), push notifications (WonderPush).
- Asynchronous processing with Symfony Messenger.
- CRON jobs for automating recurring tasks.
- Multi-tenant management of the solution with dynamic database switching based on the client.
- Management of validation rules and access rights based on roles and clients.
- Implementation of a workflow with GitHub Actions.
- Deployment and administration on a Debian server.
Frontend (React & Next.js 13)- Development of the PWA interface.
- Secure connections via JWT token.
- Integration of UI/UX mockups in collaboration with the design team.
- Consumption of backend APIs and dynamic display of content.
Product Collaboration & Organization- Close collaboration with product teams and management.
- Proactive contribution to technical choices and functional evolutions.
- Resolution of specific client issues, with a solution-oriented approach.
Reviews
Nathaniel
Développeur fullstack - Francetest
Reviewed on 4/23/2026
Thomas intervened on a critical bug in my Symfony (back) and React (front) project, and managed to fix the problem faster than I expected!
Efficient and very professional.
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