12/30/2025 updated

**** ******** ****
60 % partially available

Experienced Debian/Linux System Engineer | DevOps, Automation, CI/CD & GitLab Expert

Hoerdt, France Certified AWS SysOp/Solution Architect, DevOps (2014)
Hoerdt, France Certified AWS SysOp/Solution Architect, DevOps (2014)

About me

Senior Linux and infrastructure engineer acting as consultant and solution provider. I help organizations solve complex technical problems through structured thinking, clean system design, GitLab CI/CD automation, and reliable infrastructures. Activité exercée sous le nom professionnel « Sysdef »

Golang (Go)Data migrationGitlab CI/CD DebianPerl ScriptingBash Shell ScriptingLinux - DevOpsOTRSAnsibleCodeless


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.

Languages

GermanNative speakerEnglishFluentFrenchBasic knowledge

Project history

Technical Lead and IT Consultant / DevOps Engineer (Freelance)

do IT smart.

Internet & IT

< 10 team member

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

Senior DevOps Engineer (Debian, Go/Perl), Git Migration

OTRS AG

Internet & IT

50-250 team member

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

Full Stack Developer/Solution Architect, Perl

logical line GmbH , Hannover

Banking & Financial Services

10-50 team member

Project: Enterprise Data Aggregation Platform
Universal crawler and report generator with web-based configuration


Perl Web Application Development
Dancer framework, Plack/PSGI server architecture


Data Integration Platform
Universal data crawler supporting 10+ source formats


Middleware Engineering
XML processing pipeline, high-volume data handling (300MB+ files)


Database Architecture
MariaDB design, Perl DBI abstraction layer


RESTful API Design
Service-oriented architecture, API endpoint development


Multi-Source Data Processing
FTP, Email, XML, PDF, CSV, Excel integration


Report Generation System
Automated reporting engine with configurable templates


Frontend Development
Configuration web interface (jQuery/Zepto)


Senior Linux System Engineer, GitLab CI/CD

MB connect line GmbH, Dinkelsbühl

Internet & IT

10-50 team member

IoT Platform Architecture & DevOps


IoT Platform Modernization
Microservices-based embedded device management system


Microservices Transformation
Legacy monolith migration to distributed architecture


GitLab CI/CD Implementation
Automated pipelines for PHP, Bash, Perl deployments


Container Orchestration
Docker infrastructure, Swarm cluster management


MQTT Infrastructure
Mosquitto customization and patching for IoT messaging


Embedded Systems
OpenEmbedded build systems for custom Linux distributions


Monitoring & Alerting
Prometheus implementation with custom MAT integration


IoT Workflow Automation
Node-RED integration for device orchestration


Continuous Deployment
Multi-language CI/CD pipelines, automated testing

Senior Unix/Linux System Engineer

Leitwerk AG , Appenweier

Internet & IT

50-250 team member

Enterprise Monitoring Platform
Distributed monitoring infrastructure with automated alerting


Distributed Monitoring Systems
CheckMK/Nagios deployment across Windows/Linux environments


Cloud Infrastructure
Multi-cloud architecture design and implementation


Automation Engineering - Infrastructure automation frameworks, orchestration tooling


Documentation & Standards
Complete infrastructure documentation, system topology mapping


Enterprise Linux Support
2nd/3rd level GNU/Linux troubleshooting and optimization


Alerting & Incident Management
Multi-tier monitoring, automated escalation workflows


Cross-Platform Integration
Heterogeneous environment management (Windows/Linux)

AWS Certified SysOps Administrator / Solutions Architect, DevOps

tecRacer GmbH & Co. KG , Hannover

Internet & IT

50-250 team member

Cloud Solutions & Enterprise Support
Cloud-native solutions with HA clustering and automation

AWS Cloud Automation
Infrastructure as Code, automated deployment pipelines


High Availability Clustering
Samba HA cluster design and management


Backup & Recovery Systems
Automated backup strategies, disaster recovery implementation


Enterprise Linux Administration
Debian GNU/Linux systems management, performance tuning


Automation Engineering
Custom tooling development, infrastructure automation


Data Migration Projects
Large-scale data transfers, zero-downtime migrations


Monitoring & Alerting
Comprehensive system monitoring, proactive alerting


3rd Level Support
Complex troubleshooting, solution architecture

Head of IT / DevOps & Development Lead

Qualitätsgemeinschaft Verkehrssicherung GmbH
Distributed Enterprise IT Infrastructure
Complete IT setup for multi-site organization with remote workforce


Corporate IT Infrastructure
File servers, transfer servers, backup/recovery strategy design


Network Architecture
Internet connectivity, firewall concepts, security policies


Linux Desktop Deployment
Debian GNU/Linux workstation rollout, user training programs


Enterprise Collaboration Platform
EGroupware implementation for distributed offices and remote workers


Data Migration Projects
Legacy system migration to EGroupware infrastructure


Mobile Backend Development
XML/XSD middleware for mobile clients, schema validation


Version Control Systems
Source control infrastructure and workflows


Hybrid System Administration
Windows/Linux network and server management


High Availability Storage
Samba server clustering, redundant file services

Early Career

Deutsche Börse AG, Messe Frankfurt, CAcert Inc., CADNET GmbH, LinuNet GmbH

Internet & IT

Early career work was mainly project-based, focused on infrastructure architecture, migrations, security assessments, and system modernization, with clear responsibility and ownership rather than long-term operational roles.


Deutsche Börse AG, Frankfurt am Main
IT Consultant – Security & Migration (Project “Neue Börse”)
Security assessments for Terminal Server and Citrix environments,
Security audits of notebook images for mobile users,
Migration support and automation of UNC path fixes in Office documents.


Messe Frankfurt GmbH, Frankfurt am Main (via help AG)
Systems Engineer – Y2K Migration Project
Y2K testing and remediation,
Migration to Windows 2000 Server,
Secure Windows internet café image and disaster recovery.


CADNET GmbH, Hannover
Head of IT / Systems Architect
Overall responsibility for IT infrastructure,
Infrastructure migrations and redesign,
Redundant internet connectivity with failover,
Clustered server design and deployment.


LinuNet GmbH, Flörsheim
Security Engineer / Developer
Penetration testing and system hardening,
Perl, PHP, and shell scripting,
VPN and secure communication solutions.


CAcert Inc., New South Wales, Australia
IT Consultant / Assurance
Assurance activities and operational support,
Coordination of trade fair appearances (e.g. CeBIT).

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