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Denis MessiéDM

Denis Messié

Full Stack Developer - UI/UX designer

€650/day
1 project
Grenoble, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Denis

EFREI engineer and passionate developer for over 15 years, I became a freelancer in 2024.

Comfortable with both UX/UI design and coding, I can handle all aspects of your web or mobile application.

A strong advocate for the Flutter framework since its early days, this tool allows me to quickly create high-performing cross-platform applications.

If you prefer a web-exclusive application, my experience with the Angular framework perfectly meets this need.

Based in Grenoble, I can undertake occasional travel to Paris or Lyon.
  • French

    Native or bilingual

Can work on-site
Grenoble (up to 10km)

Experience

  • ITGA
    Developer
    ENVIRONMENTAL
    January 2026 - April 2026 (3 months)
    To assist its professional clients (industries, diagnosticians, construction companies), ITGA provides a portal to manage analysis requests, track samples, and consult results...

    The goal of the mission was to redevelop this aging portal and add various additional features.
    Our choice focused on a modular monolith (hexagonal architecture) in C#.Net
    On the front-end side, the interface is made in Angular, communicating with the back-end via a REST API.

    The back-end interfaces with different systems to manage its operation:
    • Keycloak for authentication
    • LIMS (Laboratory Information Management System) via a REST API
    • Salesforce
    • Billing API

    The whole is containerized using Docker, packaged with Aspire for development, and deployed at the client's premises using docker-compose.

    On this project, I performed various tasks:
    • UI/UX design, in collaboration with the ITGA marketing team
    • .NET back-end development
    • Angular front-end development
    • DevOps (docker-compose configuration)

    The project was carried out with the help of AI (Claude Code), and with cross-reviews within the team (Pull Request)
    C# Aspire Angular Claude Code Docker
  • Hearing Space
    Consultant and UI/UX Designer
    HEALTH AND WELLNESS
    September 2025 - April 2026 (7 months)
    Hearing Space is an audiometry software for audiologists. I was part-time for this client (1 day per week). Initially, I created mockups in Figma to modernize the audiometry software.
    Then I carried out various exploration tasks:
    • Development of a Flutter application with sound modulation to assess the possibility of performing audiometry on a tablet
    • Investigation for the integration of a pupillometry device, either in the Windows application or on the Flutter mobile application.

    I then provided assistance on the web dashboard:
    • Code audit and advice on best practices
    • Implementation of integration tests on the server side
    • Setup of automated deployment on Plesk, using Docker
    • Development of certain features

    Finally, I developed a cross-platform Flutter application to allow patients to fill out questionnaires. The application is launched securely and the questionnaire results are recorded in the Noah ES system (database for audiologists).

    Achievements
    • UI/UX design of the audiometry software, creation of mockups in Figma
    • Code audit on the web dashboard (in React.js)
    • Creation of a Flutter app POC for playing sounds at different frequencies, with different modulations (Wobbled or normal)
    • Integration testing of the web dashboard
    • Dockerization of the web dashboard and automation of its deployment on Plesk
    • Assistance in feature development for the dashboard
    • Development of the cross-platform "Questionnaire" application
    Figma Docker docker-compose Flutter Claude Code
  • Hydrao
    Full-stack Developer
    September 2018 - Today (7 years and 9 months)
    Grenoble, France
    - AWS microservices using node.js lambda functions
    - Development of the new smartphone app, using Flutter
    - Continuous integration of microservices and smartphone app.
    - Angular WebApp
    - UI/UX design
    - ...
    Flutter Node.js Angular Amazon Web Services UI/UX Design

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Education

  • IT
    Polytechnique Montréal
    2006
    IT
  • DUT informatique, Computer Science
    Université de Bourgogne
    2003
    DUT informatique, Computer Science

Skill set

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