Freelancer profile translated to English.

Description

I am Léon, a Linux & DevOps expert with over 15 years of experience in system administration and open source infrastructures.

My mission: to simplify, secure and automate your Linux environments so that they are more reliable, understandable and sustainable.

Passionate about open source, I work with companies of all sizes to help them regain control of their systems: standardization, security, automation, technical support or architecture optimization.

Here are the missions that I regularly carry out for my clients:

🔧 Standardization & reliability

Creation of coherent and reproducible environments, for simplified long-term management.

🔐 System security

Implementation of security policies (hardening, firewall, monitoring) and authentication (OpenLDAP, Kerberos, SSSD), with tools such as Wazuh, CrowdSec or Suricata.

⚙️ Automation & CI/CD

Infrastructure-as-Code with Ansible, Terraform, or FAI. Continuous integration with GitLab CI, Jenkins or ArgoCD.

📊 Monitoring & supervision

Deployment of monitoring and alerting solutions such as Grafana, Prometheus, Zabbix, Graylog, Loki or Netdata.

🧠 Audit & support

Infrastructure analysis, clear documentation, transfer of skills to technical teams.

Mastered stack:

Linux: Debian, CentOS, Slackware

IaC: Ansible, Terraform, FAI

CI/CD: GitLab CI, Jenkins, ArgoCD

Containers: Docker, Kubernetes, Podman

Security: Wazuh, CrowdSec, Suricata, OpenLDAP, Kerberos

Monitoring: Grafana, Prometheus, Zabbix, Graylog, Loki, Netdata

Virtualization: Proxmox, VMware, OpenStack, VMware to Proxmox Migration

✅ +15 years of experience

✅ 100% open source culture

✅ Pedagogical and structured approach

✅ Reactivity & concrete results

✅ Emergency intervention possible

📩 Let's discuss your Linux, DevOps or system monitoring needs!

Industry field of expertise

Languages

English
Fluent
French
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km), Lille (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Bordeaux (up to 50km)

Sagemcom
Linux Admin / SRE
April 2021 - December 2024 (3 years and 8 months)
🔹 Securing and automating the Linux fleet for R&D
🔹 Infrastructure as Code: automated migration from Debian 10 to 12 (FAI, Ansible)
🔹 Containerization & Orchestration: Kubernetes installation, creation of custom Docker images
🔹 CI/CD & DevOps: management of GitLab, Jenkins, Nexus, SonarQube, DependencyTrack
🔹 Configuration & compliance management: centralized monitoring with Rudder
🔹 R&D support & optimization: continuous integration, incident resolution, workflow improvement
🔹 Monitoring & observability: implementation of monitoring and log analysis tools
Gitlab CI/CD Docker Dockerfile Kubernetes Automation Rudder Nexus Jenkins/Sonar SonarQube Jenkins LDAP OpenLDAP
LENIX.IO
DevOps Engineer
April 2021 - Today (5 years and 2 months)
🎯 I support companies in optimizing their Linux infrastructures and automating operations, for more efficient, stable and secure systems.

My role: to design, deploy and secure agile environments, while integrating the DevOps tools adapted to your needs.

With over 15 years of experience in Linux administration, configuration management and CI/CD pipelines, I facilitate the adoption of new technologies while guaranteeing performance, compliance and robustness.

⸻

✅ Examples of missions carried out:

🔹 Linux Support & Administration
• Management and optimization of Debian & Slackware systems

🔹 Automation & Configuration
• Administration of 900+ workstations & servers with Rudder
• Management of 500+ servers via SaltStack
• Deployment and hardening of system configurations

🔹 Infrastructure as Code & Containerization
• Installation & configuration of Kubernetes clusters
• Docker image management with Harbor
• Writing Dockerfiles & Debian/Slackware packaging

🔹 Observability & Supervision
• Monitoring with Prometheus & Grafana
• Deployment of Zabbix solutions

🔹 CI/CD & DevOps
• Installation and management of Jenkins and its agents
• Advanced use of GitLab CI/CD
• Python development with the Rudder API

🔹 Security & Optimization
• System hardening & vulnerability correction
• Caching of Android Samsung updates (Squid & Apache2)

🔹 Kernel Development & Hardware Integration
• Compilation & adaptation of Linux kernels for recent hardware
Debian Docker Kubernetes Scaleway Rudder
LINAGORA
IT Manager
DIGITAL AND IT
August 2019 - April 2021 (1 year and 8 months)
La défense, France
🔹 Weekly meetings with General Management: monitoring of IT projects and issues
🔹 Management of OVH environments: dedicated servers & public cloud
🔹 Administration of OpenStack instances: configuration, supervision and maintenance
🔹 Supervision of the Xen infrastructure: maintaining operational condition
🔹 Management of the IT team: coordination of activities and skills development
🔹 Regular backup checks: security and data restoration ensured
🔹 Proactive infrastructure monitoring to guarantee availability and stability
🔹 Machine upgrades: optimized performance and security
🔹 Writing and implementation of procedures: continuous improvement of IT operations
Debian Linux Cloud computing Docker Ansible Supervision Zabbix Network administration