Michael Freitag
IT Systems Administrator
Experience
Linux Specialist
Evex-Group GmbH
- Updating production Proxmox servers from Debian 10 to 12
- Adjusting Ansible playbooks to the environment after update
- Clustering Proxmox servers
- Migrating from VMware to Proxmox
- Resolving customer issues with MySQL servers
- Implementing a backup solution including Mariabackup
- Updating Zabbix monitoring
Linux Specialist
Hitachi Rail GTS Deutschland GmbH
- Development and implementation of a repository mirror for common Linux distribution package repositories
- Integration of CheckMK monitoring
Subproject Lead
ING DiBa AG
IT project management
Tracking the migration and relocation of DevOps security-critical infrastructures
Evaluating bandwidth of network connectivity
Coordination of leased line suppliers
Automated OS deployments (PXE, Kickstart, Ansible)
Coordination of overall project, stakeholders, and departments
Coordination and management of the supplier Cisco
Definition, tracking, and reporting of milestones
Integration of bare-metal servers into cloud architectures
Linux Specialist
SAP AG
- Provisioning an iPXE server
- Integration of bare-metal servers like HP Superdome Flex into AWS Cloud
- Handover to SAP deployment (Ansible)
Linux Specialist
Deutsche Flugsicherung
Development of a new Linux distribution for automated data center installation and configuration via ISO or PXE install server
Implementation of automated provisioning of third-party virtual machines using KVM on a data center server
Adjusting automation to updates in RHEL
System hardening
Adapting packages to new dependencies
Linux Specialist Engineer
noris network AG
- Design and implementation of customer solutions
- Implementation of security policies
- Troubleshooting on internal and customer servers
Linux Specialist
SAP AG
- Provisioning of an iPXE server
- Integration of bare-metal servers like HP Superdome Flex into AWS Cloud
- Handover to SAP deployment (Ansible)
Project Lead
Thales Deutschland AG
- Virtualization with KVM, VMware ESXi, Docker
- Implementation of RAS connections without security level and for VS-NfD
- Rebuilding and hardening of the DMZ, connecting consortium partners
- Project planning (WBS, time and capacity management, risk management)
- Stakeholder management and reporting
- Definition and tracking of milestones
Second Level Support
Deutsche Post AG
- Implementation of scripts to provide statistics and accounting data to replace manual collection
- Administration of RHEL servers
- Administration of Postfix with a custom application
- Administration of VPN connections according to BSI standard
- Automation of workflows through Shell/Perl scripts
- Implementation of security policies
- DevOps rollout with Subversion/Puppet
Unix Operating
Commerzbank AG
- Further development of a web reporting tool for visualizing the current project status
- Deputy team lead
- Administration of a Solaris E10k cluster
- Datacenter operations
- Coordination of specialist departments
Unix Operating
Commerzbank AG
- Further development of a web reporting tool to visualize the current project status
- Deputy team lead
- Administration of a Solaris E10k cluster
- Datacenter operations
- Coordination of departments
Linux Instructor
QPunkt GmbH
- Instructor in training IT specialists in UNIX/Linux, networks, HTML, and PHP
- Giving lectures
- Preparing teaching materials
Linux Specialist Engineer
noris network AG
- Designing and implementing customer solutions
- Implementing security policies
- Troubleshooting internal and customer servers
Summary
I have built a solid career in IT, with a main focus on Linux systems administration and network security. I have managed the migration, update and clustering of servers, implemented automation using Ansible and provided robust solutions for backup, virtualization and cloud integrations. I actively tackle challenges from software updates to infrastructure hardening and system deployment.
I combine hands-on technical expertise with years of project and team coordination experience. I believe in creating secure, efficient and scalable IT systems that meet demanding operational requirements. My practical approach and continuous learning help me deliver reliable, up-to-date solutions in dynamic and high-pressure environments.
Skills
It Project Management, Architecture And Implementation Of Security-critical Infrastructures
Automated Os Deployments (Pxe, Kickstart, Ansible)
Integration Of Bare-metal Servers Into Cloud Architectures
Virtualization With Kvm, Vmware Esxi, Docker
System Hardening According To Bsi Standards
Stakeholder Management, Milestone Tracking And Reporting
Linux/unix Operating Systems: Rhel, Centos, Fedora, Alma, Debian, Ubuntu, Solaris, Hp-ux
Virtualization: Vmware Esxi, Kvm, Docker (Lxc)
Automation & Config Management: Ansible, Puppet, Kickstart, Ipxe
Devops & Ci/cd Tools: Git, Gitlab, Svn, Jenkins
Databases: Postgresql, Mysql/mariadb, Openldap / Slapd
Programming & Scripting: Bash, Python, Php, Sql, C
Network Services & Infrastructure: Apache, Postfix, Dovecot, Dns, Dhcp, Vpn
Project Management Tools: Jira, Confluence, Servicenow, Sharepoint, Otrs
Languages
Education
Friedrich-Alexander-Universität Erlangen
Computer Science · Erlangen, Germany
Berufsoberschule Nürnberg
Subject-specific Abitur · Nuremberg, Germany
Vorklasse FOS Fürth
Fürth, Germany
Certifications & licenses
IT Systems Administrator
Personalzertifizierungsstelle gps-cert
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