Freelancer profile translated to English.
Back to original languageAbout Sylvain
I design web applications for teams that waste time switching between too many tools: re-entering data, back-and-forth communication, repetitive tasks, and information scattered everywhere.
After 13 years managing logistics sites (Decathlon — teams, processes, budget), I've been developing digital products for startups, SMEs, and scale-ups for over 5 years, and I provide technical support for agencies.
What I handle:
- Business tools and back-offices that centralize and validate operations (React, TypeScript, Node.js, PostgreSQL / Supabase)
- MVP and SaaS evolution (auth, multi-role, permissions, performance)
- Refactoring and structuring of existing React applications
- Automating workflows between tools (API, exports, business rules) when multiple systems need to cooperate
- Marketing sites and journeys (Webflow, or React with Next.js when SEO / SSR / velocity justify it)
What you gain concretely:
- Less daily friction: less double entry, fewer errors, less "doing the same thing manually over and over"
- Tools that communicate with each other — or a single point of entry — to speed things up and make decisions based on consistent data
- An autonomous contact who understands the operational reality (adoption, deadlines, reliability)
Technologies:
- Core expertise: React, TypeScript, Node.js, PostgreSQL (Neon, Supabase), Prisma
- Next.js when it's the right product choice (MVP, full-stack, SEO, rapid deployment)
- As needed: Retool (rapid back-office), Webflow (marketing)
Recent references: circular economy (Weturn), custom digital products (X-Studio, Brulance, Lonestone)
→ Let's talk about what's wasting your time today — and the tool or release that can eliminate it.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Funérarium FontaineFull-stack Developer · Operational Management SaaS (Funeral Home)SOFTWARE PUBLISHINGOctober 2025 - Today (8 months)Charleroi, BelgiumContextPompes Funèbres Fontaine (Belgium): replacing fragmented processes (multiple tools, manual data entry) with a single platform to manage funeral files, teams, and business obligations.My RoleFull-stack development on a product monorepo (React business web app, tRPC API, Next.js public site): new features, bug fixes, quality assurance, and platform evolution in production.Business Impact
- A single tool for admin and field teams (procedures, contacts, documents, workflows)
- Reduction in errors and time lost between systems
- A scalable foundation (multi-organization, sensitive data, traceability)
Delivery / Development Cost Impact- Equipped product pipeline: Linear → assisted development (Cursor) → GitHub → previews per PR (Neon, Cloudflare) → deployment via Fly.io
- Faster and less risky iterations (preview environments, CI, code reviews)
- X-StudioFull-stack Developer · SaaS & Business ToolsDIGITAL AND ITJanuary 2025 - Today (1 year and 5 months)Colombes, FranceContextX-Studio is a digital product agency. I provide full-stack support for SaaS, business tools, and websites for startup and brand clients.My RoleAutonomous throughout the entire cycle: technical scoping, development, optimization, and redesign. Emphasis on code quality, user experience, and performance — for tools that are actually used daily, not just delivered.Key Projects*Wastetide— Circular economy project management platform. Multi-organization, roles, KPIs, and dashboards to track activity without scattered spreadsheets.*Swipelink & Curiousquad— Business web applications (React, Node API): user journeys, authentication, fine-grained permissions, and dynamic interfaces based on profiles.*X-Tract— Web application for managing emergency response at sports events: multi-project access, roles, performance calculations, and conditional views to help teams make faster decisions.*École de Natation Française— Showcase website with a custom CMS (Directus): content editable by the client without needing developer intervention for every update.*Artysquad, Maesina & X-Studio— Webflow marketing sites: sleek design, animations, content autonomy for the teams.
- WeturnFull-stack Developer · Internal ERP & Field Data CollectionLOGISTICS AND SUPPLY CHAINJuly 2024 - December 2024 (5 months)Paris, FranceContextTextile circular economy startup — needed to equip operations and field teams.Monitor (Retool)Internal ERP centralizing projects, partners, and supply chains — business interfaces, automations, reporting. No more scattered files and tools.Valo (Next.js/Nest.js)Field web app for textile collection — multi-role authentication, filters, exports, mobile interface for operators.ResultTwo tools adopted daily, developed autonomously with strong business buy-in.
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Education
- Web/Mobile Web Developer TrainingWild Code School2021
- Engineering Degree in Industrial SystemsUniversity of Technology of Troyes2009
Certifications
- First Certificate of English grade B2Cambridge Assessment English2007