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Valentin F.VF

Valentin F.

Fullstack Developer Next.js / React — SaaS MVP

On-demand
Paris, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Valentin

Do you have a SaaS idea, a web platform, or a business tool that you want to see come to life, not in 6 months after a €30k agency fee, but in the coming weeks? That's precisely where I come in.
I am an independent fullstack developer specializing in the design and delivery of complete SaaS MVPs, from backend to deployment. Modern stack (Next.js, React, Node.js, MongoDB), out-of-the-box integrations (Stripe, OAuth, AWS S3), responsive cross-device design, and architecture built to scale when your traction justifies it.
My background is atypical: trained in language sciences and formerly an independent international trainer for over 3 years, I pivoted to development by building Frenship myself, an edtech learning platform sold to real paying users. This dual product + tech expertise allows me to understand your business challenges before writing the first line of code.
What I deliver concretely:
• Complete SaaS MVPs in 3 to 6 weeks
• Payment integrations (Stripe), multi-provider authentication (Google OAuth, email), cloud infrastructure (AWS, Vercel)
• Turnkey responsive web platforms
• Taking over and finalizing projects started in no-code or via AI (Lovable, Cursor, Bolt, v0) that got stuck halfway
• Mini-games and interactive experiences in Phaser for edtech or marketing needs
If you're looking for a dev who delivers quickly, understands your product as much as your code, and doesn't disappear after the final commit, let's talk.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Frenship
    Founder & Fullstack Developer — Edtech SaaS Platform
    SOFTWARE PUBLISHING
    June 2023 - Today (3 years)
    Paris, France
    Design and full development of a responsive SaaS web platform (desktop and mobile) dedicated to learning, from backend to frontend, including cloud infrastructure, payments, and authentication.
    Technical achievements:
    • Fullstack architecture in Next.js / React / Node.js / MongoDB Atlas
    • Cloud infrastructure on AWS S3 with secure media management via signed URLs
    • Continuous deployment via GitHub and Vercel
    • Stripe integration for payments and subscription management
    • Multi-provider authentication (Google OAuth, email/password), with email account recovery via Mailgun integration
    • Development of interactive educational mini-games with Phaser, integrated into the React ecosystem via an event bus architecture
    • Design of a custom theme system in Tailwind CSS, exceeding DaisyUI's limitations to meet the specific needs of an educational interface
    • Responsive cross-device design ensuring a consistent experience from desktop to mobile
    • Implementation of a two-level internationalization system: a multilingual interface on one hand, and a dedicated translation sub-system for differentiated educational content on the other
    Commercial launch to a panel of paying users and continuous product iteration based on their feedback.
    Next.js React.js Node.js MongoDB Stripe
  • Entreprise Chinoise
    Independent Foreign Language Trainer
    EDUCATION AND E-LEARNING
    January 2023 - May 2026 (3 years and 4 months)
    Paris, France
    Independent remote trainer for Chinese learners (adults and children) wishing to learn a language, as part of an international online course platform. Students scattered across the globe: China, France, Canada, UK, Australia, Japan, Belgium.
    • Design of personalized educational programs according to each learner's level and objectives
    • Conducting individual video conferencing sessions via dedicated tools (Classin, WeChat)
    • Continuous assessment of progress and pedagogical adaptation based on feedback
    • Over 3 years of regular activity
    This experience forged my fine understanding of remote language learning challenges, a direct pedagogical basis for my current edtech project.
    Pedagogy E-learning Training Intercultural Communication Team Management

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