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Guillaume DevantoyGD

Guillaume Devantoy

Fullstack Developer

€450/day
Lyon, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

Fullstack Developer & Tech Leader

I combine technical expertise with business vision for high-impact projects.

With a Master's degree in Computer Science, my 7+ years of experience have led me to steer cutting-edge technological projects. I first consolidated my skills for 2 years in fullstack web development, before diving into the world of blockchain for 2 years. I then spent 3 years designing AI systems for businesses, while developing expertise in cybersecurity, particularly in IAM and the implementation of agent meshes. Today, as a freelancer, I combine this global and secure approach to propel your technical projects.

✅ What I bring to you:

A triple expertise: AI, Blockchain, and Web Development
A solid experience in technical leadership, team management, and project steering
A sharp business vision that allows me to align technical strategy with your business needs
A capacity to design, develop, and deliver complete, innovative, and scalable solutions

I am currently seeking freelance assignments that allow me to leverage this rich and cross-functional experience.
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • STORMSHIELD
    Backend Developer
    SOFTWARE PUBLISHING
    December 2025 - June 2026 (6 months)
    Lyon, France
    Within the Core team, I participated in the design, development, and security of the fundamental infrastructure components, with a major focus on Identity and Access Management (IAM) and secure agent communication.

    Key achievements:

    IAM & Security: Development and optimization of backend architectures dedicated to Identity and Access Management (IAM).

    Agent Mesh Management: Design and lifecycle management of agent meshes to ensure distributed and secure network communication.

    Cryptography: Implementation of advanced cryptographic protocols to guarantee the integrity and confidentiality of data and communications.

    API Design: Modeling and development of robust, performant, and highly secure APIs for the Core ecosystem.
    Typescript Node.js IAM Service Mesh Cryptography
  • Proovup
    CTO
    October 2022 - Today (3 years and 10 months)
    Lyon, France
    Development of a "cockpit" platform for managing the use of AI for businesses.
    Artificial Intelligence Python Node.js Langchain
  • Track Innov - Prooverse.io
    Developer
    May 2022 - October 2022 (5 months)
    Lyon, France
    Development of an intellectual property management platform based on blockchain technology.
    Blockchain Solidity

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Education

  • Master in Information Technology
    Epitech
    2019
    UNIX, C/C++, Python, Mathématiques, Assembleur, Algorithmes

Skill set

Categories