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

Adrien De Coster

Supermalter

Expert 👉 React, React Native, Node, JS, ...

€550/day
32 projects
Paris, FR
8-15 years

Average response time: 2 hours

Freelancer profile translated to English.
Back to original language

About Adrien

Welcome to my profile! 🚀

I'm Adrien, a Senior Full Stack Developer, specializing in JavaScript / TypeScript, expert in React, React Native & Node JS, with a CTO & entrepreneur approach.


🧩 My role: more than a developer, a quality guarantor

For over 10 years, I've been helping ambitious startups and companies transform ideas into solid, high-performing, and truly scalable web & mobile products.

🧬 My DNA:
- Premium stack: React, React Native, Node JS, TypeScript.
- Clean architecture: code designed to last, easy to evolve.
- Product vision: I anticipate your needs to deliver what truly matters.
- CTO mindset: I avoid technical debt before it appears.
- AI-ready: I leverage AI as a co-pilot to deliver faster, without sacrificing human quality.


🎯 Why my clients choose me

- Speed & quality: deliver fast, cleanly, and ready to scale.
- Fewer bugs, fewer hidden costs: clean code is cheaper to maintain.
- Smooth & transparent communication: zero surprises.
- Autonomy and vision: I'm not just an executor, but a technical partner.


✨ A concrete example

Complete overhaul of an existing React Native app:
- Cleaning up a complex codebase, reducing technical debt.
- Optimizing app performance and size.
- Implementing best practices (testing, CI/CD) to ensure stability and accelerate future releases.


🤝 Ready to move forward?

Whether you have a project to stabilize, an app to evolve, or an idea to realize, I'll help you deliver a robust, profitable product ready for what's next.

📬 Contact me and let's discuss your project!
  • English

    Fluent

  • Spanish

    Fluent

  • French

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Clokizi
    Founder
    CIVIL ENGINEERING
    October 2023 - Today (2 years and 8 months)
    Clokizi's mission is to transform intervention service management for companies of all sizes 🤯
    Our powerful scheduling and management platform allows service-oriented companies to streamline their operations, save time ⏰, and optimize their resources 📈

    With Clokizi, companies can simplify team management, improve communication 📱, and capture important intervention details, all in one place.
    React.js React Native Node.js Fastify Google Cloud Firebase Prisma PostgreSQL TailwindCSS
  • BeChat
    Founder
    TECH
    February 2023 - Today (3 years and 3 months)
    Development of a private message centralization product. 💬
    This project involves the creation of a complete platform to read, manage, and respond to different private messages directly from a single platform. This platform is intended for professionals to facilitate inbound lead management 🤯
    Prisma React.js MongoDB Firebase Google Cloud Platform (GCP) Node.js Fastify Stripe TailwindCSS
  • Tim Management
    Freelance
    CIVIL ENGINEERING
    April 2022 - October 2022 (7 months)
    Lyon, France
    👉 Complete redesign of the platform's front-end from Vue.js to React.js. The platform allows for the management and time tracking of different participants on construction sites.

    (Development)
    React.js SASS Chakra UI PHP Laravel

Reviews

5.0

Out of 15 ratings

D

David

Bleu Blanc Tech

Reviewed on 9/13/2024

Positive experience with Adrien for a from-scratch web app development project (Node/ReactJS). Adrien's major strength lies in his ability to understand needs and translate them concretely into development. The initiatives taken are the right ones, saving everyone time. Code-wise, it's clean, structured, and easily maintainable.
D

Damien

Flatchr

Reviewed on 7/22/2024

We were fortunate to collaborate with Adrien, an exceptional freelance mobile developer, on a project essential to our company. Adrien played a key role in correcting and optimizing our mobile application, making it perfectly functional and much more performant. From the beginning of his mission, Adrien was extremely comfortable with our codebase. His quick adaptation and deep understanding of our architecture were impressive. He not only fixed existing issues but also significantly improved our codebase, laying the foundation for easier maintenance and future enhancements. His technical expertise, combined with his professionalism and collaborative spirit, made Adrien an invaluable asset to the success of this project. We are very satisfied with his work and highly recommend him for any mobile development mission. We hope to have the opportunity to collaborate with him again in the future.

Recommendations

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

  • Expert in innovation and computer science
    EPITECH
    2015
    Training on computer development
  • Start-up training
    EM Lyon Business School
    2015
    Training offered by EM Lyon as part of the Lyon Start-up competition. Accelerated training on management and project launch

Skill set

Categories