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Valentin MercierVM

Valentin Mercier

Expert Full-Stack | AI Builder | Bubble.io | MVP⚒️

€490/day
4 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Valentin

Hello 👋,
I am aFull-Stack & AI Builderdeveloper. I buildMVPs**, **SaaS**, and **AI agentsin production from framing to deployment.
Before that: strategy at OuiHelp, creation and resale of Tastyn (2024), then first tech hire at Cardino (€15M GMV/month).

🔹 What I build
- **Full-stack web applications**: SaaS, CRMs, marketplaces, internal tools
- **AI agents & LLM integrations**: Claude/GPT pipelines, persistent memory, intelligent automations
- **Rapid MVPs**, production-ready, with no technical debt

🚀 Why work with me?
-30+ projects delivered**, **+€5M raisedby my clients
- **Product-oriented approach**: I think business before thinking technical
-Internationalexperience: France, Germany, Switzerland, England

💼 Collaboration
Fixed price only — clear budget, defined scope, zero surprises.

🔗 Ready to turn your ideas into reality? Contact me! 😊

💻 Stack
Next.js · Supabase · TypeScript · PostgreSQL · n8n · Bubble.io
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Cardino
    Lead Dev (CDI)
    AUTOMOBILE
    September 2023 - October 2024 (1 year and 1 month)
    Berlin, Germany
    Cardinois a C2B marketplace dedicated to electric vehicles. I joined the team as the first developer.

    My role:
    - Creation of solid processes for a large team (4 devs/+6 product/+2 automations)
    - Achieving performance using the best low-code practices (from 0 to 500+ active users)
    - Complex API integration REST, SOAP, Websocket (12+ integrations)
    - Creation and management of a complex bidding algorithm and transaction system (from $0 to $10M volume per month)
    - Work on app performance (Improvement of Lighthouse score from 42 to 78)

    **Stack**: Bubble.io, n8n, Make, Airtable


    Cardino in numbers:
    - 45 employees
    - 6 countries
    - 15,000+ users
    - €4M raised in seed
    Bubble.io Bubble Make n8n Airtable Notion JavaScript HTML/CSS PostgreSQL
  • Tastyn
    Co-founder
    RESTAURANTS AND FOOD SERVICE
    July 2021 - March 2024 (2 years and 8 months)
    Paris, France
    Tastyn is the food corner that allows companies, school campuses, and co-working spaces of all sizes to access fresh products from local caterers easily!

    On the technical side, I worked on:
    👉 the creation of our back office
    - delivery planning tool (custom calendar and automated synchronization with our suppliers)
    - product management (product creation/modification/deletion)
    - customer CRM (sending push notifications or SMS via TWILIO, creating promo codes, expense tracking, automation for several customer scenarios...)
    - metrics dashboard (real-time sales tracking, KPIs, reporting...)
    - custom customer support integrated with our connected corner (remote door opening via WebSocket API, instant customer refunds, sending email or SMS templates...)
    - Alerts and notifications in case of food corner/customer issues by integrating Slack

    👉 creation of the Tastyn mobile app in low code
    - account creation with geolocation
    - adding payment methods (credit card and meal vouchers) via Stripe and Paygreen
    - real-time display of products in stock in our corner (via API integration)
    - interaction with our IOT corner (door opening by scanning a QR code)
    - transaction tracking and PDF invoice sending
    - Multi-language (French - English)
    Bubble.io Make Zapier Integromat Notion Airtable Product roadmap MVP

Reviews

5.0

Out of 3 ratings

D

Dunoyer

Fondateur - Ateliers Chefs - Chefs

Reviewed on 12/24/2025

Valentin is an excellent professional, very rigorous and deeply invested in his work. I entrusted him with an automation project for the company with a very clear vision of what I wanted to implement. He immediately understood my needs, but above all went far beyond my initial ideas, proposing more intelligent, smoother, and more accomplished solutions than I had imagined. The final result is a robust, coherent application that is truly above my expectations. Thank you for your work, your precision, and your ability to transform a vision into a concrete and efficient tool. See you soon for the next projects.
V

Vivien

Dailycieux

Reviewed on 7/29/2025

I worked with Valentin on the creation of a food delivery e-commerce site. This project included both the front office for the customer and the back office for managing orders, dishes available for specific time slots, setting up specific time slots and delivery fees based on the package destination, and of course managing payments and billing. The challenges were multiple: first, the reflection around the redesign with a double sales funnel allowing users to order from different contact points we had identified. Secondly, the transfer of our customers from our old hard-coded application to this new application. Throughout all phases of the project, in addition to his technical expertise, Valentin was able to advise me and guide me on product considerations, going far beyond his purely development-oriented mission. I appreciated the smooth and natural interaction that was established, both with me and with the other project stakeholders. Beyond the project delivery, Valentin supported us throughout the migration phase until the application was functioning optimally. Even after delivery, he was very responsive in applying some minor fixes, inherent to any new application launch. After a few months of launch and a few thousand orders, I am still as satisfied with the work done. The application runs in the best possible way. Therefore, I can only recommend Valentin, both for his technical knowledge and his approach to projects!

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Education

  • Master in Management
    Kedge Business School
    2020

Skill set

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