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Adrien G.AG

Adrien G.

Senior Fullstack Developer Node.js NestJS React

€550/day
Strasbourg, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Adrien

Lead fullstack developer React / Node.js for 10 years, I build and evolve production SaaS products — from architecture to internal tools that support operations.

My strength: taking full ownership of a scope (front, back, infra, backoffice), arbitrating priorities with product management, and delivering.

My last 3 missions:
- Linkup (AI startup) — refactoring authentication and API key management system (quotas, budgets), with Python contributions on back services and tooling scripts
- Loopaero — Tech Lead for the architecture from scratch of a private jet booking SaaS platform (Next.js front + NestJS back + GraphQL API), onboarding a junior developer
- TellDem — full backend for a social network MVP (endpoints + Retool moderation backoffice)

Stack: TypeScript, Next.js and React on the front, NestJS and Node.js on the back, PostgreSQL, Docker, CI/CD. I'm also comfortable working with Python codebases when the context requires it (AI ecosystems, tooling scripts, existing services). I also master Retool to deliver backoffices in days instead of weeks.

Background: international scale-up (Ogury, AdTech, 17+ countries) · large group (Amadeus, travel tech) · bank (Natixis, employee savings) · startups and product projects (Linkup, Loopaero, TellDem, Chance).

Sectors: B2B SaaS · AdTech · EdTech · FinTech · TravelTech · AI · Aviation

Based in Strasbourg, fully remote or on-site in Alsace / Grand Est. Fluent English (daily use in international environments).
  • French

    Native or bilingual

  • English

    Fluent

  • German

    Basic

Can work on-site
Strasbourg (up to 30km)

Experience

  • Linkup
    Senior Fullstack Developer React.js/Node.js
    TECH
    January 2026 - April 2026 (3 months)
    Paris, France
    Linkup - French startup specializing in artificial intelligence and search APIs for AI agents.

    - Complete refactoring of the authentication system with better-auth: session management, token rotation, SSO implementation.
    - Extension of the existing API key management system: whitelist management, usage quotas per key, budget limits, and team allocation within organizations.
    - Development of front-end interfaces with React, React Router, and Tailwind for user key and parameter management.
    - Creation of automated front-end tests with Playwright.
    - Backend development in NestJS, with Python interventions on the platform's existing services and writing of tooling scripts (migrations, technical tasks).

    Stack: NestJS · React · React Router · Tailwind · TypeScript · Playwright · better-auth · SSO · Python
    NestJS React.js TypeScript Python AI Agent
  • Telldem
    Backend Developer - Nest.js
    SOCIAL NETWORKS
    January 2025 - April 2026 (1 year and 3 months)
    TellDem — MVP of a social networking application with a polling system around a daily question.

    • Complete backend development with Nest.js: all necessary endpoints for the MVP.
    • Creation of automated tests to ensure endpoint reliability.
    • Design and delivery of the moderation backoffice in Retool (user management, reports, dashboards).

    Stack: NestJS · TypeScript · PostgreSQL · Retool · REST API · Firebase
    NestJS Node.js PostgreSQL Retool Firebase
  • LoopAero
    Lead Developer React.js / Node.js
    SOFTWARE PUBLISHING
    September 2023 - December 2025 (2 years and 3 months)
    Strasbourg, France
    Loopaero — SaaS platform for private jet booking, developed from scratch.

    - Complete front-end architecture Next.js / React + back-end NestJS / TypeScript
    - Design and implementation of the design system (reusable components)
    - Development of the GraphQL API, third-party integrations, reservation management, and user journey.
    - Onboarding and supervision of a junior developer in a pair programming setup.

    Stack: Next.js · React · NestJS · TypeScript · GraphQL · PostgreSQL · Docker · CI/CD
    Next.js MongoDB TailwindCSS React.js Team Management

Recommendations

Florian Vander PutFV
Antoine KrajncAK
Jeremie PoutrinJP
+1
Florian Vander Put and 3 other people have recommended Adrien

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Education

  • Computer Engineering, IT Systems Security and Electronic Payments
    Ecole nationale supérieure d'Ingénieurs de Caen
    2015
    Ingénieur en informatique, Sécurité des systèmes informatiques et monétique
  • DUT Networks and Telecommunications
    IUT d'Ifs
    2012
    DUT Réseaux et Télécommunications

Skill set

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