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Siham LahoualiSL

Siham Lahouali

Supermalter

Web Developer | Nextjs | Reactjs | Nodejs

€450/day
3 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Siham

Looking for a Next.js / React frontend developer to strengthen your team?
You're in the right place.
I have 6 years of experience in React / TypeScript frontend development, with the last year entirely dedicated to Next.js (App Router) on a production B2B application.
I am finishing a mission at the end of June for a major public infrastructure player, with the delivery of the first MVP of a B2B document management application. I am therefore available from July for a new mission. I have also collaborated with L'Oréal, Allianz Trade, and Les Greniers d'Abondance.
I can support you with:

Frontend architecture for a Next.js application (App Router, Server / Client Components, SSR + SWR patterns)
Development of complete features: from design systems to complex business flows (forms, modals, DataGrid, autocomplete, etc.)
Integration with REST / API Platform APIs (Symfony backend), including error handling, caching, and mutation
Setting up SSO authentication (Keycloak expertise)
Code quality: unit tests (Jest / RTL), code reviews, refactoring, accessibility
Sharing best practices within the team (clean code, architecture, Git conventions)

I work in Agile mode (Jira, GitLab) and quickly integrate into teams where front, back, QA, and PM collaborate daily.
What sets me apart: particular attention to code testability and maintainability. Every feature delivered is covered by unit tests and designed to evolve over time, without hidden technical debt.
Do you have a project?
Contact me.
  • French

    Native or bilingual

  • English

    Conversational

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

Experience

  • Société des Grands Projets
    Frontend Developer Nextjs
    PUBLIC SECTOR
    November 2025 - Today (9 months)
    Saint-Denis, France
    Development of the frontend for a B2B business application dedicated to the management and transfer of technical documents related to the Grand Paris Express works, for various partners.
    I was responsible for setting up the design system, developing business modules (batch management, bulk sending, user management), as well as unit tests and technical documentation on SSO authentication.
    Next.js Typescript Design System Testing Documentation
  • Swiffy
    Fullstack Developer
    PUBLIC SECTOR
    April 2025 - August 2025 (4 months)
    Paris, France
    → Mission Objective:
    Design and develop an intelligent booking web application, with timezone management and real-time synchronization, to simplify planning between clients and service providers.

    → Achievements:

    Full frontend + backend development (React.js / NestJS) with robust business logic and modular architecture.

    Advanced timezone management (Europe/Paris ↔ UTC), slot validation and real-time availability.

    Secure API for managing bookings, notifications, and external integration.

    Modern and fluid interface, optimized UX and performance (lazy loading, React optimization).

    Automated deployment on Render with CI/CD and cloud database (MongoDB / Supabase).

    → Technical Stack:
    React.js, NestJS, TypeScript, Tailwind CSS, ShadcnUI, Supabase, Render
    Typescript Supabase Stripe React.js Node.js
  • DevisZen
    Fullstack Developer
    SOFTWARE PUBLISHING
    January 2025 - March 2025 (2 months)
    Paris, France
    → Mission Objective:
    Create a modern web application to generate, manage, and export quotes and invoices quickly, intuitively, and professionally.

    → Achievements:

    Design of a clear and minimalist interface with Next.js + TypeScript, focused on productivity.

    Automated generation of styled PDFs (quotes / invoices) with numbering, status, and payment tracking.

    Secure authentication system and Supabase storage for users and documents.

    Implementation of a responsive dashboard with real-time sorting, filtering, and creation.

    SEO and performance optimization (Core Web Vitals, optimized Next.js build).

    → Technical Stack:
    Next.js, TypeScript, Supabase, Tailwind CSS, ShadcnUI, Vercel
    Prisma React.js Supabase Typescript Next.js

Recommendations

Alban Le GalAL
AC
Jérémi GuerinJG
Alban Le Gal and 2 other people have recommended Siham

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Education

  • on LangChain, LangGraph, agents, tools, evaluation, observability, and generative UI (Nodejs / React / Next.js)
    GenAI Labs
    2025
    sur LangChain,LangGraph, agents, outils,évaluation,observabilité et UI générative (Nodejs / React / Next.js)
  • TDD & Clean Architecture (Node.js)
    2022
    TDD & Clean Architecture (Node.js

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