Freelancer profile translated to English.

Description

Full Stack Developer on complex B2B/B2C SaaS products in production.

I work end-to-end, from React components to Node/NestJS APIs, from PostgreSQL schema to Docker deployment. I take on a fullstack subject autonomously: I don't just deliver my part, I ensure the whole thing holds together.

**Specialty**: React / TypeScript Frontend. I design scalable front architectures and high-performance interfaces focused on Core Web Vitals. Accustomed to demanding contexts: large accounts, early-stage startups, critical refactoring of non-functional portals.

**Backend**: Proficient in Node.js + Express + NestJS + PostgreSQL + GraphQL. Capable of managing a coherent backend architecture, high-performance server-side RESTful/GraphQL APIs, or fullstack co-design on a monorepo.

What this looks like in practice:

Fullstack admin SaaS application designed from scratch (React + NestJS + PostgreSQL), delivered to production and maintained throughout the mission.
Non-functional React portal restored to stable condition in 6 months — zero critical regressions post-launch.
LCP divided by 2.5 (from ~5s to ~2s) on a large enterprise platform — taken initiative, without waiting for specs.

My specialty remains React/TypeScript frontend — architecture, performance, scalability. But I build the backend to go with it, I design the API, and I work in a fullstack monorepo without it being an issue.

I adapt to the context: **early-stage startup**, large enterprise under pressure, greenfield without existing base, **taking over a chaotic codebase**. I pick up projects where they are blocked.

Industry field of expertise

Languages

French
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 20km)

Beauty Sphere
Full Stack Web Developer
FASHION AND COSMETICS
July 2025 - March 2026 (8 months)
Paris, France
Freelance remote mission - React / TypeScript Frontend Developer

Greenfield project: no existing frontend base. I designed and developed the entire application from scratch, from architecture to interfaces delivered to production.

Hexagonal architecture (ports & adapters) implemented from the start: strict isolation of business logic from technical details, guaranteed scalability for subsequent developers.

Complete administration interface and KPI dashboards developed from scratch with React, TypeScript, TailwindCSS, and TanStack Query — delivered to production throughout the mission.

Advanced caching strategy: TanStack Query configured with gcTime, staleTime, and networkMode offlineFirst, local persistence via IndexedDB — total network resilience.

Design Tokens: system of variables (colors, typography, spacing) for strict visual consistency and simplified maintenance.

Accelerated workflow via Claude Code: CLAUDE.md custom configured (based on levu304/claude-code-boilerplate, adapted to the project) with specialized agents and quality gates — accelerated bootstrapping and delivery without compromising architectural quality.
React.js TanStack Query Web Performance Web Development Front-End Development
NOUVELLE SOCIETE D'INFOGERANCE
On Malt
Frontend Web Developer
TECH
March 2025 - July 2025 (4 months)
Paris, France
Freelance remote mission - React / TypeScript Frontend Developer

React portal taken over in a non-functional state, delivered as a stable production solution in 6 months — zero critical regressions post-launch.

Hexagonal architecture: decoupling business logic from technical tools and external infrastructures, improved testability across the entire codebase.

State management with MobX: business logic isolated in stores, clear separation of responsibilities, improved long-term maintainability.

API call caching with React Query: reduction of unnecessary re-fetches, measurable improvement in perceived fluidity in production.

Design system with Shadcn UI: reusable components integrated and adapted to the existing design system, visual harmonization across the entire application.

Stack: React, TypeScript, Shadcn UI, MobX, React Query, TailwindCSS, d3.js, i18next
React.js TanStack Query Typescript Shadcn TailwindCSS
SYLink Technologie
On Malt
Frontend Web Developer
TECH
February 2025 - March 2025 (1 month)
Paris, France
Correct font size and color issues, and title homogenization for better readability.
Revise button ergonomics to avoid confusion about their functionality.
Optimize scroll placement and modal size to improve user experience.
Verify and adjust data display on charts.
Improve performance by optimizing infinite scroll and page loading.
Fix z-index issues, so that some elements no longer appear under titles during scrolling.
Implementation of new features
Proposal of a new intuitive design
React.js TanStack Query Performance Improvement Typescript TailwindCSS

Check out Christian's experience

Florent

NOUVELLE SOCIETE D'INFOGERANCE

Reviewed on 6/14/2025

Christian once again demonstrated his technical expertise on this React project. His mastery of integration and API implementation is remarkable. Strengths: - Solid technical mastery of React and APIs - Impeccable quality of work - Respect for deadlines and fluid communication - Autonomy and proactivity in development It's a pleasure to work with Christian for the second time. His professionalism and technical rigor make him a trustworthy developer whom I recommend without hesitation. See you soon for future projects!

Florent

NOUVELLE SOCIETE D'INFOGERANCE

Reviewed on 5/14/2025

Christian delivered high-quality work in the front-end development of our management portal. He demonstrated excellent technical mastery in implementing UX/UI interfaces, perfectly respecting our requirements and deadlines. His methodical approach and ability to quickly understand our specific needs were particularly appreciated. Christian proposed relevant and innovative solutions while ensuring the user experience remained intuitive and effective. His collaboration with the team was exemplary, showing real communication and adaptability skills. His professionalism and commitment largely contributed to the success of this project. We are so satisfied with his performance that we decided to extend his mission by an additional month. I highly recommend Christian for any front-end development project requiring technical expertise and design sense.

Show all 4 reviews