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Valentin GuillamonVG

Valentin Guillamon

Full-stack web developer

€300/day
Tours, FR
8-15 years
JavaScript
Node.js
Puppeteer
Playwright
Google Cloud

Average response time: 1 hour

Freelancer profile translated to English.
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About Valentin

With 10 years of experience in innovative startups in fintech and e-commerce, I now offer my services as a freelance full-stack developer.

I work with companies looking to accelerate their digital projects, putting my expertise at your disposal across the entire production chain: backend development (Node.js), frontend (React, Tailwind CSS), continuous integration and deployment (CI/CD with GitHub), cloud (Google Cloud Platform), and feature management (Unleash).

Accustomed to working in an agile environment (squads), I master JavaScript/TypeScript technologies and adapt quickly to your business challenges. My goal: to support you in the design, development, and optimization of your applications, with a pragmatic and results-oriented approach.

Contact me to discuss your needs and discover how I can contribute to the success of your projects.
Software Publishing
Digital and IT Services

  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Basic

Can work on-site
Tours (up to 10km), Paris (up to 10km), Bordeaux (up to 10km)

Experience

  • Freelance
    Web Developer
    SOFTWARE PUBLISHING
    January 2025 - May 2026 (1 year and 4 months)
    Tours, France
    Development of a data management solution for compliance with the DORA (Digital Operational Resilience Act) Directive, enabling financial institutions to structure, validate, and export their digital operational resilience data to the ACPR's OneGate platform.

    Business challenges:
    - Regulatory compliance: Ensures compliance with DORA requirements in managing incident and resilience data
    - Data traceability: Rigorous validation of critical data for audit and compliance
    - Reduction of processing times: Automation of report preparation cycles (before: manual/Excel -> after: semi-automated, 70% reduction in generation/validation time)

    Technologies: Javascript, Node.js, React, XBRL
    DORA XBRL ACPR Node.js React.js
  • Wanteeed
    Full-stack web developer
    E-COMMERCE
    August 2020 - September 2024 (4 years and 1 month)
    Bordeaux, France
    Wanteeed is a browser extension (and Android+iOS apps) offering users an automatic coupon code retrieval and testing service, directly integrated into the checkout funnel of several hundred e-commerce sites, enabling immediate discounts on user purchases. Wanteeed also offers a cashback service.

    Tasks, within the "promo code - gift voucher" squad:

    - Development and monitoring of features dedicated to coupon code retrieval (web scraping [puppeteer, playwright], API scraping, storage..)
    - Development and monitoring of features dedicated to applying coupon codes on several hundred e-commerce sites (e.g., sorting codes by discounts observed in carts to speed up testing, UI enhancements..)
    - Development and monitoring of features dedicated to the Android application and the integrated coupon code tester (Kotlin)
    - Development and integration of the gift voucher service, in white label (through a partner, the user makes their purchase with a gift voucher granting them a percentage of cashback and reducing the cost of their purchase)

    Environment:
    nodjs, TypeScript, GraphQL, Postgres, Kotlin, Google Cloud Platform, React
    Node.js JavaScript Google Cloud Platform Playwright React.js
  • Bankin'
    Back-end developer / DSP2
    October 2016 - June 2020 (3 years and 8 months)
    Île-de-France, France
    Bankin' is an iOS/Android application for better financial management.

    Banking aggregation, transfer, and financial coaching features enable 4 million users to manage their finances more easily.

    As a back-end developer in the "banking connection" team, I was responsible for developing new banking connectors and maintaining existing ones (+350 across France, Spain, UK, Germany, NL):
    BNP Paribas, Crédit Agricole, Paypal, Boursorama, Revolut, Crédit du Nord etc

    • Connector development: web scraping (phantomJS+casperJS/ slimer/pupeteer) or API scraping (nodejs)
    • Maintenance + evolution of web/api/DSP2 connectors: monitoring (SQL/ Rollbar), N3 support [Jira/Trello/Kanban]
    • Development and evolution of DSP2 connectors (wiki/Payment Services Directive): testing banking APIs (sandbox + evolutions) and implementation in production + others (TI/TU [jest/mocha/chai+express], web reverse engineering [AngularJS/React] + Android [burp, SMALI, frida], internal tooling [QOL/CI/CD])
    Node.js JavaScript Puppeteer CasperJS PhantomJS
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Education

  • IT and Robotics Project Manager BAC+5
    IMERIR
    2014
    Chef de projet Informatique et Robotique BAC+5
  • Computer Management BTS BAC+2
    Lycée Paul-Louis-Courier
    2010
    BTS Informatique de Gestion BAC+2

Skill set

Content Integration
CMS Customization
External API integration
Front End Interface Development
Backend Service Development
CI/CD Management
Scripting Automation

Categories