Freelancer profile translated to English.

Description

Next.js Developer | React | React Native | 17 years of experience | Post-MVP Specialist

You've validated your market with low-code, no-code, or a simple "quick MVP," but the app is starting to show its limits?

Recurring bugs, impossible to add features without breaking everything, degrading performance?

I develop your next scalable application.

What I do:

Complete web & mobile applications

React.js / Next.js for web
React Native for iOS + Android

A project for both web and mobile?

I provide the unique codebase.
One budget, 3 platforms

Migration MVP => Scalable Architecture

Transition from Bubble, Webflow, Airtable... To a modern stack
Taking over the existing without losing your data or your users
Architecture designed for 10,000+ users from the start

Technical Audit of your MVP

Complete analysis of the existing before diving in
Identification of blocking points
Clear, step-by-step migration plan
Delivery within 10 days

My Difference:

For several startups, I act as an outsourced CTO.

I challenge, I structure your technical roadmap, I help you avoid costly mistakes 6 months down the line.

You benefit from senior expertise without hiring a full-time CTO.

Innovation Tax Credit

I am CII approved: Get my services reimbursed via tax credit.

Typical Clients:post-MVP startups, B2B/B2C SaaS, mobile apps, CEOs looking to scale.

Availability:missions from 2 weeks to several months. Response within 24 hours.

Contact me for an initial discussion!

Languages

French
Native or bilingual
English
Conversational

Workplace preferences

Remote only

Primarily works remotely

KevinDumont
On Malt
Post-MVP Support The Engine
RETAIL (SMALL BUSINESS)
April 2026 - May 2026 (1 month)
Development of a social media action automation SaaS.
Design of a per-user queue system to orchestrate large-scale message and invitation sending.
- Queue-oriented architecture (asynchronous jobs, per-account rate limiting)
- Multi-tenant management and user workflow isolation
- Retry and task monitoring system
- CI/CD and automated testing
- Clean architecture
Stack: React, TypeScript, Node.js, Supabase
React.js Web Developer TypeScript Developer SAAS Clean Architecture
Hellobox
CTO - Developer
CULTURE
December 2025 - April 2026 (4 months)
Backend technical audit for a SaaS startup (mobile app with AI).
Codebase 80k+ lines, technical debt blocking evolution.

- NestJS codebase audit: quality, security
- Terraform/AWS EKS infrastructure and RAG pipeline review
- Prioritized remediation roadmap (57-78 days of debt identified)
- Post-audit: implementation of critical recommendations
- Development of new features on a cleaned foundation

Stack: NestJS, MongoDB, Terraform, AWS EKS, RAG

Deliverable: audit report + action plan + execution
NestJs Technical Audit Startup Back-End Development Web Development
Stride-up
CTO - Developer
DIGITAL AND IT
October 2025 - Today (8 months)
Technical audit and architecture file for a post-MVP SaaS.
Unstable application after 9 months of development, unable to scale.

- Full audit: codebase, architecture, security, performance
- Identification of technical debt (estimated 45-50 days)
- Analysis of critical vulnerabilities (API validation, asset storage, security)
- Prioritized remediation roadmap in 4 phases
- Post-audit support: implementation of recommendations
- Development of new features on a cleaned foundation

Stack: Next.js 15, TypeScript, Zustand, Tailwind, Shadcn

Deliverable: full audit report + action plan + execution
Next.js Development Next.js Developer Audit Front-End Development Back-End Development

Check out Nicolas's experience

Kévin

CEO de The Engine - KevinDumont

Reviewed on 5/5/2026

I hired Nicolas to be the firefighter for my coded app. He fixed all the bugs in a few days of work. I am continuing to collaborate with him for new features. Very good professional, conscientious and pragmatic! I recommend him.

Hadi

Audit MVP - MH DEV SOLUTIONS

Reviewed on 4/17/2026

After our MVP phase, we needed an external perspective to prioritize tasks before scaling. Nicolas provided a clear diagnosis, delivered a solid remediation roadmap for technical debt and vulnerabilities, and supported us in monitoring its implementation. Pragmatic, rigorous, and he understands post-MVP realities. I recommend him.