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Bérenger StasseBS

Bérenger Stasse

SaaS, Apps, AI, MVP Developer | React, Node, TS

€580/day
2 projects
Paris, FR
15+ years

Average response time: 2 hours

Freelancer profile translated to English.
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About Bérenger

Senior Product Fullstack Developer · React / Node / TypeScript · SaaS Expert • B2B & AI

Are you launching aSaaS**, looking to refactor a **platform**, or need **technical reinforcementthat **understands product as well as code**. You want things to move **fast**, last in the long run, and avoid re-explaining everything in every meeting.

For 15 years, I've been building complete web products, from database schema to onboarding screen. Backend, API, UI, integrations:a single person who masters the wholeand makes the right decisions at every layer.

What I deliver

The core of a SaaS**: auth & RBAC, multi-tenancy, **billing(subscriptions, webhooks, invoices), asynchronous jobs, transactional emails, notifications, observability.

↪ No need for a second profile to cover the scope.

**A React UI that gets the job done**: strict TypeScript, reusable components, clean state management, performance, accessibility, edge cases. Stack: **React**, **Node**, **TypeScript**, Tailwind, tests (Vitest / Cypress), CI/CD.



**Frictionless integrations**: Stripe, S3, OAuth, Supabase, webhooks, third-party APIs. I read docs, I connect, it works.



**AI that truly serves the product**: agents, RAG, embeddings, speech-to-text, OpenAI / Anthropic / Elevenlabs. Not demos: features running in production.

How I work

We start with a **realistic MVP**: defined scope, clear priorities, predictable budget. Then we **iterate**: each sprint has a concrete goal, the product evolves, technical debt doesn't accumulate silently. We stay agile.

What changes

15 years on various stacks and in demanding contexts, from the urgently launched v1 to the mature product to refactor, I quickly get up to speed, identify blockers, and deliver without creating new problems.

☑ Single point of contact
☑ Full autonomy
☑ Clean delivery from the first sprint
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Charleville-Mézières (up to 50km), Strasbourg (up to 50km), Metz (up to 50km), Amiens (up to 50km)

Experience

  • Enspirit
    Senior Fullstack Product Developer - SaaS B2B Real Estate (Cazaregister)
    DIGITAL AND IT
    October 2025 - Today (10 months)
    Bruxelles, Belgium
    The project:Fullstack frontend-oriented development of the SaaS platform "Cazaregister", intended to become a benchmark for connecting tenant applicants / social real estate agencies in Belgium.

    Stack:with Vue, Supabase, Webspicy, Cypress, EMB, Tolgee, Tailwind.

    My mission:Taking over an existing process within Enspirit, participating in technical, business, and organizational decisions, unit tests, integration tests, end-to-end tests, UI integration, …

    Results:In just a few weeks, a solid, functional, and usable product. Active participation in acquiring new users for this platform.
    SAAS TypeScript Node.js Supabase Fullstack
  • Travexploit SA
    Senior Fullstack Product Developer - Internal Multi-tenant SaaS (BTP Digitalization)
    CIVIL ENGINEERING
    June 2022 - April 2026 (3 years and 10 months)
    Charleroi, Belgium
    Full responsibility for the digitalization of internal processes and the client's internal management application.

    Development of an internal platform for multiple companies, multiple users.

    Development of a planning system, timesheet, purchase order management, supplier management, automation, email, validation process, etc...

    Porting to a hybrid application with Ionic.

    Creation and maintenance of synchronization processes between different tools and management of the platform's hosting in microservices.
    intranet React.js TypeScript Node.js Ionic
  • FR Team International
    Senior Fullstack Product Developer - Logistics Management Tool Redesign
    AUTOMOBILE
    May 2024 - September 2025 (1 year and 4 months)
    Luxembourg, Luxembourg
    The project:Taking over and maintaining an internal management tool developed under Symfony and evolving the tool with a decoupled Svelte frontend.

    Stack:Symfony, Svelte, SvelteKit, Tailwind, MySQL, Docker.

    My mission:Taking over and maintaining an internal management tool developed under Symfony: bug fixing, adding new features, configuring environments, integrating with micro-services, and optimizing queries.

    Evolving the tool with a Svelte frontend: developing user interfaces, integrating APIs, and improving user experience. Developing new modules for logistics management.

    Results:New modules dedicated to logistics management delivered, logistics team better equipped and more efficient, improved processes, modernized interface.
    Symfony Svelte API TailwindCSS Docker

Reviews

5.0

Out of 2 ratings

G

Gael

Directeur pédagogique - BEELDENS MANAGEMENT

Several days project

-

Reviewed on 3/31/2026

I contacted Bérenger to automate email sending and several features on my web application. The result perfectly met my expectations: fast, clean, and efficient work. Beyond the technical aspect, I particularly appreciated the quality of the exchanges. The project scoping was clear, the discussions simple, natural, and above all very effective. This is clearly the type of collaboration that saves time and provides peace of mind. I highly recommend Bérenger
MartinM

Martin

CEO Martin Ferret - Martin Ferret

Reviewed on 3/16/2026

As a freelancer, my website is my main showcase. I knew there were areas for improvement, but without a clear vision of priorities. My site runs on Next.js. I needed someone who truly understood the stack, not someone who skimmed the HTML and concluded. Bérenger has in-depth knowledge of React and Next.js. That changes everything: the observations are relevant, the proposed solutions are adapted to the project's reality, not copied-pasted from a generic checklist. The audit is dense in value, without filler. Each identified point has a reason, a clear explanation, and a concrete action behind it. You can feel that priorities were set with perspective, distinguishing immediate quick wins, what can wait, and what has the most impact. This level of discernment is not improvised. It comes from years spent on various projects, distinguishing what truly matters from what looks good on a report. No fluff, no vague recommendations. A deliverable that you open and execute.

Recommendations

NG
Olivier MéryOM
FU
+1
Nicolas Genon and 3 other people have recommended Bérenger

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Education

  • Full Stack Development
    Self-taught / Self learning
    2010

Skill set

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