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Eric LeguenEL

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About Eric

Eric LEGUEN

Fullstack Developer & Expert in Legacy Tool Modernization

I take back control of your software tools when you have lost the expertise or the publisher no longer exists.

Proof:
• Reverse engineering of GIS software for maintenance, modernization of its thin client, deployment time reduced by 90% (Sdel CC).
• Correction of +1600 security vulnerabilities, migration and restart of a critical project (U-Tech).

Offer:
Audit, takeover or modernization on a fixed-price basis.

👉 You are concerned if your tool is down, its publisher has disappeared, or your teams no longer master its code.

Shall we talk about it?
Tel: | ✉
  • French

    Native or bilingual

  • English

    Native or bilingual

Can work on-site
Nantes (up to 50km), Paris (up to 10km), Rennes (up to 10km), Lyon (up to 10km), Lille (up to 10km)

Experience

  • U-Tech
    Developer
    July 2025 - Today (11 months)
    TASKS:
    • Perform a complementary security audit
    • Report alerts
    • Evaluate the workload
    • Classify tasks by criticality and implementation batch
    • Make decisions on planning
    • Set up a development VM (VMS Ubuntu) to reproduce the initial environment
    • Apply patches reported by the security audit (rewriting of +900 SQL queries and protection of +700 XSS vulnerabilities) Migrate the application within the U ecosystem with CPanel to GCP with Red
  • Ynov
    Instructor
    March 2025 - July 2025 (4 months)
    • Course preparation
    • Training on the Angular 18 framework
    • Implementation of evaluation modules
    • Setup of a Node.js API Server for practical work
    • API design and implementation
    • Setup and launch of an Angular project
    • Project management assistance
    • Learner support during training.
    • Languages: Angular, Typescript, Node.js, Deno
    • Systems: Windows, Ubuntu
    • Others: Communication, Git, Pedagogy, Deno
  • Sdel CC
    Technical Manager / Fullstack Dev.
    ENERGY AND UTILITIES
    July 2024 - June 2025 (11 months)
    PROJECT DESCRIPTION:
    As part of the acquisition of source code for software following the closure of its publisher and due to a lack of technical documentation, I was asked to perform reverse engineering of the source code to explain the internal workings of the software, maintain it, and evolve it.
    Migration of a thin client under Laravel to a solution based on Deno with Preact, an optimized version of React, to establish a scalable base that will eventually replace the thick client.
    C# Deno React.js SQL Server GIS

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Education

  • Develop accessible web sites (RGAA)
    Access42
    2024
    Formation certifiante aux normes RGAA.
  • Vue.js 3
    Self-training / Upgrade
    2024
    Prise en main du framework Vue.js en version 3

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