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Guillaume MombelletGM

Guillaume Mombellet

Full Stack Developer

€200/day
1 project
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

Graduated with a double degree in Mathematics & Computer Science from Paris-Saclay, I develop web applications and custom tools for companies and freelancers.
Autonomous, rigorous, and pedagogical, I work on concrete projects with a real focus on results.

⭐ Recent Projects
TradingPassif.com
Python bots that analyze, execute, and monitor trades 24/7. Scraping, AI, custom dashboards. 10 private users.

veroniquebrottier.com
SEO first experience: HTML, CSS, PHP, pure JavaScript + automated emailing and quizzes.

USMA Échecs
Transition from paper to web: MySQL database, admin interface, online registrations. Member management time divided by 4.
(+ dozens of mini-tools: intelligent Outlook auto-responder, Java games, C++ simulations…)

🔧 Stack
HTML / CSS / JS (Vanilla, React), PHP, Python (Flask, FastAPI, Pandas), MySQL & SQLite, Git, Docker. IDE: VS Code & IntelliJ.

🚀 What I bring
Adaptability: I understand even vague needs and quickly gain skills on new frameworks.
Follow-up: support after delivery and adjustments included.

📅 Availability
Assignments from 1 day to 1 month, 7 days a week, remote or hybrid Paris.

💶 Rate
Daily rate €200/day, adjustable according to project complexity.
Write to me, I respond within the day.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • German

    Basic

  • Italian

    Basic

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

Experience

  • Marseillementvotre
    Front-end developer
    TRAVEL AND TOURISM
    April 2022 - May 2022 (1 month)
    Creation of a professional website for a furnished rental owner + quality monitoring tool

    🔹 Custom website with integrated online booking
    Development of a website for a professional furnished rental owner, designed to offer a smooth booking experience, optimize property visibility, and simplify stay management. The site plays a central role in the customer journey, while naturally integrating into the overall business operations.

    🔹 Interactive checklist for cleaning follow-up
    Development of a complementary tool, accessible from the site, allowing cleaning teams to complete a digital checklist after each intervention.
    ✅ Upon validation, an automatic email is sent to the owner, ensuring rigorous and real-time monitoring of property preparation.

    ➡️ The whole significantly improves operational efficiency, the quality perceived by tenants, and the owner's responsiveness.
    JavaScript, HTML5, CSS3, PHP, MySQL Automation Mail Management
  • tradingPassif.com
    Backend Developer & Data Analyst
    PRIVATE EQUITY
    February 2022 - Today (4 years and 6 months)
    Creation of an algorithmic trading ecosystem specializing in cryptocurrencies.
    I design and deploy autonomous trading bots, optimized by advanced statistical models, for intelligent and automated portfolio management.

    This project, born from my interest in long-term investment and data, allowed me to consolidate advanced skills in:

    Artificial intelligence applied to trading,
    Cloud infrastructure management (AWS),
    High-performance databases,
    Real-time automation and monitoring.

    The first users are close investors (friends and family), with continuous feedback to refine the algorithms.
    The project is online here: tradingPassif.com
    🔒 System in constant evolution, with a vision: to make passive investing truly intelligent.
    Python
  • 1000motsparminute.com
    Full-stack web developer
    HEALTH AND WELLNESS
    April 2025 - June 2025 (2 months)
    I created a full HTML, CSS, JavaScript website to test my skills in UI, design, SEO optimization, and the use of a language model.
    The principle of the site is a personality test that is a bit different from others since instead of checkboxes, we have text areas with answers that are then analyzed by AI. This allows for much greater precision.
    The result is very convincing and is available at 1000motsparminute.com
    JavaScript, HTML5, CSS3, PHP, MySQL

Reviews

5.0

Out of 1 rating

V

Veronique

Marseillement vôtre

Reviewed on 9/5/2025

I entrusted Guillaume with a complex project involving several technical aspects: setting up my website, creating two interactive quizzes with programmed email series, a decision tree enriched with AI-generated elements, and the realization of three complete sales funnels for my different offers. Guillaume brilliantly met the challenge, delivering work of great quality, perfectly structured and fully functional. His ability to combine full-stack development, integration of multiple services, and intelligent solutions is impressive. Beyond his technical skills, I particularly appreciated his rigor, his responsiveness, and his sense of optimization. Each step was carried out professionally, on time, and with fluid and pleasant communication. A young developer capable of transforming complex needs into concrete and efficient solutions. I recommend Guillaume without any reservation! With top value for money.

Recommendations

TL
VB
Théodore Lafond-Rozenberg and 1 other person have recommended Guillaume

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Education

  • Baccalaureate in Mathematics Physics
    Saint Michel des Batignolles
    2023
    Baccalauréat Maths Physique
  • Double degree in Mathematics and Computer Science
    Paris Saclay
    Double licence Maths Informatique

Skill set

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