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Guillaume ColinGC

Guillaume Colin

React & Node.js Specialist | Web App Creation

€450/day
Saint-Quentin-en-Yvelines, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

💻 Full-Stack React & Node.js Developer, I help companies design and deploy reliable, performant, and secure business-oriented web applications.

I handle projects end-to-end: architecture, front-end and back-end development, API integration, online payments, authentication, and deployment automation (CI/CD).
I have notably worked with Azure environments (Azure DevOps, App Services), Stripe, CRMs, and AI APIs (OpenAI).

Accustomed to projects with high business stakes (billing, subscriptions, data synchronization, internal tools), I ensure the delivery of maintainable, scalable solutions adapted to real user needs.

Core Skills:

Back-end: Node.js, Sequelize
Front-end: React, Tailwind CSS, CSS / Sass
DevOps & Cloud: Azure DevOps, App Services, CI/CD
APIs & Payments: Stripe, OpenAI, Brevo, Mailchimp
Tools: GitHub, Postman

📩 Open to collaboration opportunities, I would be delighted to discuss your projects.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Saint-Quentin-en-Yvelines (up to 50km), Paris (up to 50km)

Experience

  • cv-analyse.fr - Projet personnel
    Full-Stack Developer & Founder | AI CV Analysis SaaS
    August 2024 - Today (1 year and 10 months)
    Design, development, and deployment of an AI-powered CV analysis SaaS (cv-analyse.fr), aimed at candidates seeking to optimize their resumes and maximize their chances in recruitment.
    The application analyzes a CV (PDF/DOCX), generates a score out of 100 along with detailed feedback by sub-categories (structure, clarity, keywords, quantification), and offers automatic matching with a target job offer.
    Features developed:
    – AI CV Analysis (PDF/DOCX parsing + multi-criteria scoring via OpenAI)
    – AI-assisted cover letter and CV generator
    – Subscription and payment system (Stripe)
    – OAuth Authentication (Google)
    – Admin dashboard with user and activity monitoring
    – Automatic generation of SEO guides and dynamic sitemap
    – User referral system
    – Transactional and marketing email sending (Brevo)
    Technical Achievements:
    – From-scratch full-stack architecture: React front-end + Redux Toolkit + Tailwind CSS, Node.js / Express / Sequelize / MySQL back-end
    – OpenAI API integration for semantic extraction and scoring
    – Deployment and CI/CD on Vercel (front) and Scalingo (back)
    – Complete implementation of the Stripe payment funnel with a pivot in the business model: redesign of the initial subscription system to a credit-based system (management of one-time payments, webhooks, user consumption tracking)
    Stack: React 18, Redux Toolkit, Tailwind CSS, Node.js, Express, Sequelize, MySQL, OpenAI API, Stripe, Brevo, Google/LinkedIn OAuth, Vercel, Scalingo
    Node.js TailwindCSS React.js REST APIs Stripe
  • HA PLUS PME
    Full-Stack Developer
    December 2022 - Today (3 years and 5 months)
    As a full-stack web developer, I design and implement high-performance applications using React for the front-end and Node.js for the back-end. I focus on UX/UI optimization, application deployment with Azure, and integration of solutions like Brevo for email management, ensuring scalability and security. I also handle database management, process automation, and communication with external APIs for various projects.

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