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Quentin DerosinQD

Quentin Derosin

Lead Developer / Software Engineer

€700/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Quentin

I translate client and product needs into delivered features, without breaking the rest of the application in the process.

8 years of development experience, including 3 dedicated to the large-scale deployment of GenAI solutions: 4,000,000+ AI-generated emails for 150 clients and 300,000 users, with monitoring and CI/CD in place.

Python, Django, React, LLM/RAG, Docker/K8s. Autonomous, clean code. I clarify vague specs before coding, not after.

Available to take charge of the technical consistency of your GenAI projects — from architecture to deployment — autonomously or as a lead on an existing team.
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • Mantra
    Software Engineer
    January 2023 - Today (3 years and 6 months)
    ~150 clients 300,000 users 4,000,000+ emails sent
    • • Technical lead: specification management, task estimation and prioritization
    • • Design and development of a cybersecurity awareness SaaS platform (Django / React / Flask) — course management, user tracking, real-time dashboards
    • • Development and industrialization of phishing simulation campaigns (LLM agnostic)
    ◦ ◦ Automatic generation of phishing emails via GenAI models — over 4,000,000 emails sent
    ◦ ◦ CI/CD pipelines (GitlabCI / Docker) for AI model deployment
    • • Integration of GenAI / AgenticAI solutions
    ◦ ◦ Course generation from documents via LLM
    ◦ ◦ Freechat with RAG on Azure AI Search — questions about client documents and cybersecurity in general
    • • Application security design: permissions (AUTH0), identification of critical entry points
    LLM RAG AI Agent Python Google Cloud
  • Polyconseil
    Software Engineer
    September 2020 - December 2022 (2 years and 3 months)
    • • Development of an urban mobility supervision platform (Django / React)
    ◦ ◦ Creation of Rest APIs, real-time data retrieval
    ◦ ◦ Data visualization, flow monitoring
    ◦ ◦ SSO implementation with SAML protocol
    • • Intranet development
    • • Member of the recruitment team
    Python React.js GraphQL Kubernetes
  • Actemium (Vinci Energies)
    Software Engineer Apprentice
    September 2017 - August 2020 (2 years and 11 months)
    • • Development of a configurable ETL (Python / Pandas / Flask)
    • • Development of a real-time hypervisor for managing urban infrastructures and equipment status
    Python JavaScript Java

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Education

  • Engineering Degree
    2020
    Diplôme d'Ingénieur
  • EPITA Apprenticeship Preparatory Class
    ISTY
    2017
    EPITA En apprentissage Classe Préparatoire

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