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Lionel DemangeonLD

Lionel Demangeon

System Engineer - DEVOPS

€600/day
Nantes, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Lionel

🚨 Struggling to find a DevOps / Symfony Developer who truly understands your needs?

👉 Someone who masters both development and infrastructure. Not just titles on a CV.

You're looking for a profile that:

🔹 knows DevOps best practices (CI/CD, Docker, Kubernetes)
🔹 has the right developer mindset (Symfony, APIs, architecture)
🔹 speaks infrastructure, automation, scalability AND code quality without getting lost

You've come to the right place.

I am available for DevOps / Full-Stack Development missions with 15+ years of field experience.

And if I'm not available, I work with a network of experienced professionals: tested and validated developers, DevOps, SysOps.

❌ No unnecessary jargon
❌ No theoretical profiles
âś… Just people who know what they're doing, and do it well

✔️ Infrastructure as Code and complete automation (Ansible, Terraform)
✔️ Scalable and performant Symfony applications (FrankenPHP, REST APIs)
✔️ Cloud-native architecture (Docker, Kubernetes)
✔️ Robust CI/CD pipelines (GitLab, GitHub Actions, Jenkins)

đź’ˇ Want real technical support that understands your business?

Not just "someone who does testing"?

đź“© Write to me in DM.

I'll save you time — and improve quality.
  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Nantes (up to 50km), Nantes (up to 100km), Niort (up to km)

Experience

  • Lazengo
    Full Stack Developer
    E-COMMERCE
    January 2023 - Today (3 years and 5 months)
    Niort, France
    🚀 Lazengo.com: High-Performance Full-Stack Platform
    https://www.lazengo.com
    Design and integral development of a next-generation marketplace connecting professionals and individuals

    Ultra-High Performance Web Architecture

    Symfony Stack + FrankenPHP in Worker mode: up to 4x faster than a classic architecture, with drastically reduced memory consumption

    Optimized response times and ultra-fluid user experience thanks to the modern FrankenPHP web server

    Responsive TailwindCSS interfaces with RESTful API integrations for real-time interactions

    Scalable Cloud Native Infrastructure

    Docker containerized deployment on Ubuntu/Debian VPS

    Kubernetes orchestration ensuring 24/7 high availability

    Automatic auto-scaling adapted to real-time user load

    DevOps Excellence & Complete Automation

    GitHub Actions CI/CD Pipelines: zero-downtime continuous deployment

    Multi-level automated tests (unit, integration, functional)

    Automatic rollback in case of anomaly for maximum security

    Real-time application monitoring and proactive alerts

    Digital Marketing & Growth Hacking

    Multimedia content creation: Instagram visuals and videos for viral campaigns

    Advanced SEO optimization for maximum visibility

    Analytics and A/B testing for conversion rate maximization

    Advanced Integrations

    Secure payment services

    Affiliate system for exponential growth

    Microservices architecture for unlimited scalability

    Mastered Technical Stack
    Symfony/PHP - FrankenPHP Worker Mode - Docker/Kubernetes - JavaScript/TailwindCSS - GitHub Actions CI/CD - Ubuntu/Debian - REST APIs - PostgreSQL - Real-time Monitoring

    Result: Production-ready platform, highly scalable and performant, capable of handling thousands of simultaneous users with an impeccable user experience.
    Symfony DevOps front-end-interface-development Back-End Development CEO
  • Microsoft – Smacl Assurances
    Tech Lead
    BANKING AND INSURANCE
    February 2024 - Today (2 years and 4 months)
    Niort, France
    Integration into a team of 8 engineers and integrators. Management of the IT system transformation with a global approach focused on MECM management of the Windows 10, Windows 11 machine and application fleet. Implementation of a proactive monitoring system that eliminated 98% of vulnerabilities across the entire IT infrastructure, MECM, Qualys, and Aternity. Standardization and industrialization of deployment methods by adapting the application packaging process, Innosetup, powershell, Intunes, MECM. Design and deployment of the new Windows 11 foundation. Creation of verification and provisioning tools in powershell. Deployment assistance and user support. Technical expertise on MECM, Windows 10/11, PowerShell, Active Directory, GPO, Intune environments.
    System Administration SCCM Project Management Windows Scripting
  • MAIF
    DevOps Engineer
    BANKING AND INSURANCE
    January 2019 - January 2022 (3 years)
    Niort, France
    Coordination of deployments for 4 distinct development teams, ensuring consistency, reliability, and adherence to delivery schedules through GitLab CI/CD and Jenkins orchestration. Mastery of the complete DevOps chain: use of GitLab software infrastructure (source code management and pipelines), Jenkins (CI/CD automation), Nexus (repository manager for artifacts), and Ansible (configuration automation) to secure deployment processes. Development of customized CI/CD pipelines adapted to the specific business needs of each team, integrating automated tests, blue-green deployments, and automatic rollback. Advanced automation: development of Python and Bash scripts to streamline recurring processes, reducing manual interventions by 60% and minimizing human error risks. Orchestration of continuous integration and delivery of software components on RHEL 8 environments, ensuring the quality of production environments. Technical expertise on RHEL 8 environments, Python/Bash development, GitLab CI/CD, Jenkins pipelines, Nexus repository management, and Ansible playbooks for assurance infrastructures.
    DevOps Scripting scripting-automation ci-cd-management Windows

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