11/11/2026 updated
80 % partially available
Experienced Debian/Linux System Engineer | DevOps, Automation, CI/CD & GitLab Expert
Hoerdt, France
Only remote
Certified AWS SysOp/Solution Architect, DevOps (2014)About me
Senior Linux and infrastructure engineer, consultant and solution provider. I help organizations solve complex technical problems through structured thinking, clean system design, GitLab CI/CD automation and reliable infrastructure. Activité exercée sous le nom professionnel « Sysdef »
Application Programming Interfaces (APIs)Amazon Web ServicesPenetration TestingAutomationBash ShellCloud ComputingComputer SecurityComputer ProgrammingDatabasesConsultingContinuous IntegrationData MigrationData StoreDebian LinuxLinux
Skills & Expertise
Senior technical consultant and solution provider with a strong Linux and infrastructure background. I support organizations in solving complex technical challenges through structured analysis, clean system design, automation, and long-term sustainable solutions.
Core Focus
Technical consulting and solution architecture.
Structured problem solving and decision support.
Automation, reliability, and maintainability.
Operating Systems & Platforms
Debian GNU/Linux,
Embedded Linux / OpenEmbedded.
DevOps, Automation & IaC
GitLab CI/CD, continuous integration and delivery,
Ansible,
Automated system environments (IaC),
Docker, Docker Swarm.
Programming & Scripting
Golang (Go),
Perl Developer, Legacy Code Analysis and Migration,
Bash shell scripting.
Infrastructure & Distributed Systems
High-availability (HA) clusters,
Cloud computing (AWS),
MQTT,
Redis Cluster.
Databases & Data Stores
MySQL / MariaDB,
CockroachDB,
Redis (K/V, Pub/Sub, Streams, Cluster, etc.).
APIs & Integration
RESTful APIs,
GraphQL,
XML / XSD,
API linting and validation.
Monitoring, Operations & Backup
Prometheus and metrics-based monitoring,
Smart-Backup strategies,
OTRS.
Security
IT security architecture,
Security middleware,
Penetration testing and system hardening,
VPN technologies.
Migration & Modernization
Data and system migrations,
Legacy system analysis and modernization,
Infrastructure consolidation.
Working Style & Soft Skills
Strong team player with a preference for short, focused, and productive meetings.
Goal-oriented and solution-driven with clear agreements and ownership.
Open, honest, and transparent communication, even when it is inconvenient.
High attention to detail and quality.
Long-term perspective on system design, risks, dead ends, and technology lifecycles.
Focus on sustainable, maintainable solutions instead of short-lived trends.
Experience
Professional experience10+ years
Freelancer since1991
Languages
GermanNative speakerEnglishFluentFrenchBasic knowledge
Project history
GitLab CI/CD Pipeline Architecture
Multi-stage builds, cross-compilation (AMD64/ARM64), automated testing
Backend Development
Golang, distributed systems architecture
Database Infrastructure
Redis (RediSearch, RedisJSON), CockroachDB cluster management
Container Engineering
FROM scratch builds, static linking, multi-arch images
DevOps Automation
Build tooling, test frameworks, package registry management
Infrastructure Optimization
Resource efficiency, caching strategies, minimal attack surface
OTRS Enterprise Migration
Legacy ticketing system modernization and GitLab integration
GitLab Infrastructure Setup
Enterprise GitLab deployment, configuration management, user onboarding
Version Control Migration
SVN to GitLab migration with full commit history preservation
Legacy System Maintenance
Perl debugging and optimization for OTRS 6/7/8
CI/CD Pipeline Development
GitLab workflow automation, deployment pipelines
Platform Modernization
Golang development for OTRS 2025+ architecture
System Integration
API development, service orchestration, Ansible
Project Work
Solution architect and Debian GNU/Linux system engineer on a project basis, focused on GitLab and DevOps
Further Training
Self-management, agile development, container and cloud technologies