You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Yann MostowskiYM

Yann Mostowski

Full Stack Developer | Next.js - Supabase - SaaS

€400/day
2 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Yann

I design and develop modern and scalable web applications, with a particular focus on user experience and business needs.

Co-founder of an AI automation agency for VSEs/SMEs, I have a pragmatic approach to development: I create robust tools, designed for practical use and process optimization.

What I offer

  • Complete development of web applications (MVP, SaaS product, Marketplace, internal tools...)
  • Advanced Supabase integration: security, authentication, database, server logic
  • Implementation of AI features (LLMs) to enhance your tools
  • Integration of secure payment systems (e.g., Stripe, Lemon Squeezy, Mangopay...)
  • Setup of automated workflows

Technical Skills

  • Frontend: Next.js · React · Tailwind CSS
  • Backend: Supabase (auth, database, edge functions, realtime) · Node.js
  • AI & Automation: LLMs (OpenAI API, etc.) · Zapier/n8n
  • DevOps / Tools: Vercel · Docker · GitHub

My added value

  • Autonomy and responsiveness
  • Strong product sense: I prioritize essential features
  • Dual expertise: Web Development + AI Automation
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Antomoto
    Malt logoOn Malt
    Development of Business Tool MVP & AI Integration
    AUTOMOBILE
    January 2026 - January 2026 (1 month)
    Design and development of a tailor-made business solution integrating generative artificial intelligence to assist operational teams. The mission consisted of deploying a functional test version to validate field use cases before industrialization.
    Next.js Supabase React.js LLM API
  • Développeur web
    Freelance Developer
    November 2025 - Today (9 months)
    For over three years, I have been working as a freelance web developer. I have designed and developed showcase websites and web applications, helping my clients to create tailor-made solutions adapted to their needs and objectives. In 2025, I joined the Malt platform to structure my independent activity and expand my professional network.
    React.js Next.js Supabase TailwindCSS Node.js
  • Nova Studio
    Co-Founder
    March 2025 - Today (1 year and 5 months)
    Nova Studio is a young, results-oriented AI automation agency specializing in optimizing the work routines of entrepreneurs and SMEs. We design custom automations and tools to eliminate repetitive and time-consuming tasks (invoicing, quotes, scheduling, communication, CRM), enabling our clients to focus on their core business and save significant time daily.

    Our approach is based on analyzing existing processes, identifying friction points, and then implementing customized workflows and solutions, integrated with existing tools, with a clear objective of simplicity, reliability, and rapid return on investment.
    Artificial Intelligence AI Integration API n8n Automation

Reviews

5.0

Out of 2 ratings

A

Anthony

Dev pilote - Antomoto

Reviewed on 1/27/2026

A very appreciated involvement in the project, as well as a global understanding of our expectations. Looking forward to developing V1 with Yann following our pilot tests.
L

Levi

Founder RSI - RSI

Reviewed on 5/6/2026

Recommendations

AT
Ruddy RisselinRR
Mathieu DubustMD
+3
Anthony Tambe and 5 other people have recommended Yann

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • RNCP Level 6 – Web and Mobile Development
    42 Paris
    La formation RNCP niveau 6 en Développement Web et Mobile vise à former des développeurs full-stack capables de concevoir, développer et maintenir des applications web et mobiles modernes, performantes et sécurisées.
  • ARCHITECT OF DIGITAL TECHNOLOGIES
    42 Paris
    2025
    ARCHITECTE DES TECHNOLOGIES NUMÉRIQUES

Skill set

Categories