Linux Specialist

Public Services
01/2019 -
Main focus: Senior Application Support Management
- Management of applications in production and pre-production
- Administration of JBoss, Tomcat and Apache / PHP based applications running on Linux and MySQL or Oracle database
- Change-, Incident- and Problem-Management based on ITIL with Remedy
- Proble analysis and troubleshooting with Linux command line tools
- Developing, maintaining and enhancing Shell-Scripts and Python-Scripts
- Enhancing and updating the technical and organisational documentation

Bank
09/2017 - 12/2018
Main focus: Senior Application Support Management
- Management of applications in production and pre-production
- Administration of Websphere and IBM Business Process Manager based applications running on Red Hat Linux and Oracle database
- Change-, Incident- and Problem-Management based on ITIL with HPSM
- Performance analysis and troubleshooting with Dynatrace and Linux command line tools
- Developing, maintaining and enhancing Shell-Scripts and Python/Jython-Scripts
- Enhancing and updating the technical and organisational documentation

Aerospace Industry
05/2017 – 08/2017
Main focus: Senior IT system and network administration
- Administration, configuration and supervise of the company network and servers running under Linux (Red Hat, CentOS, Debian)
- Administration of the Active Directory and Exchange server in an Office 365 environment
- Administration and configuration of the virtual infrastructure running under VMware vSphere and Proxmox
- Migration from Proxmox to VMware vSphere
- Proposal for a new IP telephony system
- Administration and support of desktop PCs running under Linux, Windows or Mac OS
- Administration and configuration of network systems (Switches, Firewall, VPN, IP Telephony)

International mail order company
08/2008 – 02/2017
Main focus: Management of development and testing servers running on SuSE Enterprise Linux
- Collaboration in a project to migrate the development, testing and production systems from hardware to virtual machines
- Customising the Linux system to match the requirements of the virtualized environments
- Conceptual design an implementation of a security concept involving a jump server to access the virtualized development, test and production systems with the integration of an SSH key management system
- Development of a web-based SSH key management system with roll-based access authorisation for servers
- Proof of Concept of a virtualisation for the development and testing systems
- Evaluation using container technologies (Docker) instead of virtual machines based on VMware vSphere
- Coordination and supply of testing environments during all phases of testing
- Administration of a Majordomo system with a couple of hundreds of mailing lists
- Coordination of software projects with third-party systems for the diverse testing phases
- Conceptual design of a virtualisation platform based on VMware ESX, including a business case, for the development and testing environment
- Identification of potential technical, functional or organisational gaps as well as options to improve processes in the department
- The composition of practical ideas for improvement
- Improving and updating the technical and organisational documentation

Investment bank
11/2001 – 07/2008
Main focus: Enterprise Computing und System Engineering
- SAN: RDAC with StorageTek and HDLM und Device Mapper Multipath with Hitachi Data Systems under Red Hat Enterprise Linux (RHEL)
- Collaboration in implementing of CMMI Level 3
- Migration from Inhouse-Provisioning-System to IBM Tivoli Provisioning Manager
- Implementation of a global LDAP solution for the Frankfurt branch
- Global Build Management
Rollout- and Migration strategies for the worldwide usage of Global Builds
Integration of global database builds with global operation system builds
Maintenance of the existing Global Builds
- Global Linux Build based on Red Hat Enterprise Linux, conceptional design and implementation of installation methods, maintenance mechanisms, SOX compliant test scenarios with the aim to develop a Linux build to be used in all international branches
- Administration and setup of cluster systems with diskless nodes for risk analyses
- Administration and setup of redundant servers for electronic marketplaces
- Disaster Recovery:
  Planning, development and realisation of disaster recovery test and procedures
- Migrating several software projects from Solaris to Red Hat Enterprise Linux
- Oracle RAC Proof of Concept
  Oracle 9i on Red Hat Advanced Server 2.1 in conjunction with GFS (Sistina / Red Hat) cluster filesystem and SAN
  Oracle 10g on Red Hat Advanced Server 3 und SAN
  Failover tests of RAC-Nodes, DR-Tests with the simulation of SAN interruption Documenting the PoC

- Development of scripts to automate the deployments of new software releases in web-applications
- Development and implementation of a logging server (Client-Server) to store audit relevant data in the scope of SOX
- Conceptual design and implementation of HA systems with shared SAN storage, IP takeover and automation by using event handlers
- Writing system documentation and operating manuals, mainly in English
- Moving servers in the context of relocating data centres
- Connecting the HP hardware monitoring to an existing system monitoring software via SNMP
- Developing and implementing automated server installations
- Implementation of DNS servers within the scope of network segregation
- Evaluating new hardware, performance tests, integration tests, comparison with systems already in use and writing management summaries for decision making
- Evaluating Solaris 10 on Intel x86 and AMD Opteron servers, the main aspect was to determine if Solaris 10 can be used instead of an enterprise Linux distribution
- Administration of servers running on
  Solaris 2.5.1 to Solaris 10, Red Hat Advanced Server 2.1 to 5, SuSE SLES 8
 
Other projects
04/2003 – 05/2005
- Migration from Microsoft Windows to Linux on the desktop (law offices)
- Monitoring distributed systems with Nagios, programming of plugins and event handlers
- Administration of distributed systems with Cfengine
 
IT training company (as an employee)
04/2000 – 10/2001
- Planning and conceptual design of new training
- Training customers in Linux (system administration, network administration, heterogeneous networks, security)
- Preparing and maintaining the training material
- Setup and management of the VUE test centre
 
Electricity supplier
06/1999 – 12/1999
- Migration from Novell to Linux / Samba
Programming under Linux and Windows
- Documentation of software projects
 
International IT hardware manufacturer
05/1996 – 03/2000
- Presales-Consulting for server, network components and telecommunication hardware
- Supporting Sales Representatives
- In-house training and presentations for distributors and reseller
 

Miscellaneous
1993 – 2000
- Implementation of Linux firewalls and Linux servers in heterogeneous networks
- In-house training for users on Microsoft Windows and Microsoft Office