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Samuel C.SC

Samuel C.

Fullstack TypeScript [NestJS, React, AI, Agents]

€400/day
22 projects
Paris, FR
8-15 years

Average response time: A few days

Freelancer profile translated to English.
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About Samuel

Senior Full-Stack TypeScript Developer with 8+ years of experience. I design and deliver complex SaaS platforms in production — from backend architecture to UI, including AI integration.

What I bring to your projects:
  • Complete SaaS platforms — NestJS + React monorepos in production, Prisma ORM, PostgreSQL, multi-tenant RBAC, dozens of data models
  • AI integration in production — document extraction pipelines, autonomous agents, structured output, multi-providers (Claude, Gemini, OpenAI)
  • Solid architecture — microservices, event-driven, GraphQL, REST, queues, auto-deploy CI/CD
  • Business integrations — Stripe (subscriptions, webhooks, checkout), AWS S3, Cloudflare R2, third-party APIs
  • Quality — tests (Vitest, Jest, Playwright), Sentry monitoring, rigorous code review
Technical Stack:
  • Backend: NestJS, Node.js, Express, Prisma, PostgreSQL, GraphQL
  • Frontend: React, Next.js, Vite, TailwindCSS, shadcn/ui, Framer Motion
  • AI & Automation: Claude API, Gemini AI, OpenAI, LangChain, OCR, autonomous agents
  • Infra: Docker, Linux, AWS, Cloudflare R2, GitHub Actions, Sentry
  • Mobile: Capacitor, React Native
My Approach:

Autonomous and pragmatic. I take a ticket, I deliver. Atomic PRs, clear documentation, zero over-engineering. Comfortable with large codebases (300+ components, 50+ models). Direct communication in French and English.
Available for fullstack TypeScript missions, AI integration, or building SaaS from scratch.
  • French

    Native or bilingual

  • English

    Native or bilingual

Can work on-site
Paris (up to 50km), Paris (up to 50km), Mulhouse (up to 50km), Lyon (up to 10km)

Experience

  • Ville de rêve
    Malt logoOn Malt
    Fullstack python vue js
    November 2025 - December 2025 (1 month)
    Design and development of a complete B2B payment system for Metricity, a SaaS platform

    Backend(Python/FastAPI):
    - Complete purchase funnel architecture: quotes, orders, invoicing
    - Stripe integration (checkout sessions, webhooks)
    - Handling of bank transfer payments and Chorus Pro for public authorities
    - Dynamic pricing system based on geographical entity population
    - Automatic generation of PDF quotes and invoices with S3 upload
    - Transactional email sending service
    - JWT authentication for the admin back-office
    - Access token system for clients after payment
    - Database migrations with Alembic
    - Security: rate-limiting, SIRET validation (Luhn algorithm), security logging

    Frontend(Vue 3/Vite):
    - Complete administration interface: dashboard, quote and order management
    - Checkout and cart pages with adaptive customer form (companies/public authorities)
    - Payment confirmation and error handling pages
    - API integration with Pinia store

    **Stack**: FastAPI, PostgreSQL, Stripe, Vue 3, Pinia, Tailwind CSS
    Python FastAPI Vue.js Stripe PostgreSQL
  • FireOn
    Malt logoOn Malt
    Fullstack Developer
    July 2025 - July 2025
    Tbilissi, Géorgie
    🔧 Backend & Infrastructure
    - Design and deployment of multiple serverless Edge Functions for asynchronous processing
    - Scalable RESTful API architecture with advanced rate limiting management
    - Implementation of multi-level authentication and authorization systems
    - Performance optimization and concurrency management

    🤖 Artificial Intelligence
    - Integration of multi-provider AI services (OpenAI, Anthropic, other LLMs)
    - Development of intelligent document processing pipelines
    - Creation of automated data analysis and extraction workflows
    - Prompt fine-tuning for AI result optimization

    ⚛️ Frontend & UX
    - Development of responsive and accessible React/TypeScript interfaces
    - Implementation of reusable components with a unified design system
    - Complex state management and client performance optimization
    - Full internationalization (i18n) multi-language support

    🗄️ Technical Stack
    - Backend: Supabase (PostgreSQL, Edge Functions, Auth, Storage)
    - Frontend: React 18, TypeScript, TailwindCSS, shadcn/ui
    - AI: Multi-provider integrations, streaming API, token management
    - DevOps: CI/CD, monitoring, environment management

    Strengths:

    - Scalable and maintainable architecture
    - Production-ready code with tests and documentation
    - Infrastructure cost optimization
  • gaetan lamotte Nutz
    Malt logoOn Malt
    Frontend Developer & SEO Specialist
    December 2024 - December 2024
    Balikpapan, Indonésie
    I created an MDX content library 📚 to display dynamic FAQs, blog posts, formulas, and more using server-side rendering. The project was developed with TypeScript and Next.js, using Velite for MDX. The content is enriched with rich text and structured data schemas to optimize SEO and allow Nutz.fr to rank high in Google results 🚀. A fully dynamic and auto-generated solution, ready for optimal referencing.
    Typescript Web Integration JavaScript TailwindCSS Next.js GitHub Landing page React.js Responsive design SEO SEO Strategy mdx Markdown Blog

Reviews

5.0

Out of 16 ratings

J

Jerome

CTO - Ville de rêve

Several days project

-

Reviewed on 12/4/2025

Very good work on Python backend and Vuejs frontend. Samuel is responsive, adaptable, proposes solutions, and his code is clean, clear, and structured.
A

Alex

FireOn

Reviewed on 8/18/2025

Very satisfied with the collaboration with Samuel I worked with Samuel on the complete development of our SaaS platform. It was an ambitious project with quite a few technical challenges, particularly in integrating different AI services and document management. What I liked was his ability to quickly understand the business issues behind the technical requests. He doesn't just code what's asked of him; he thinks about the impact on the end-user and often proposes relevant alternatives. On the technical side, Samuel knows his subject well. He implemented a solid architecture with Supabase and React, managed complex aspects like rate limiting and Edge Functions without issues. The code is clean and well-organized, which will allow us to evolve the platform easily. Communication went very well. Samuel is direct; he doesn't hesitate to say when something is complex or when there's a better way to do it. It's appreciated to have someone transparent who doesn't oversell. Overall, the project went smoothly, and the result is exactly what we expected, or even better in some aspects. I would not hesitate to hire him again for our future developments.

Recommendations

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+2
Joseph Balekiala and 28 other people have recommended Samuel

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Education

  • Master's degree in Computer Science
    EPITECH
    2022
    Diplôme d'ingénieur en Informatique
  • Web Developer Associate's Degree
    OpenClassroom
    2022
    développent web avec react

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