Manfred S.
Senior System Engineer Linux
Experience
Jan 2024 - Present
1 year 9 monthsHybrid
Senior System Engineer Linux
DB InfraGo AG
- Setting up and updating virtual machines for operational rail infrastructure.
- Software:
- VMWare vSphere 6 – 8
- Veeam Backup
- Microsoft Active Directory (AD), DNS, NPS, WSUS
- RedHat Satellite Server
- rSyslog Server
- Icinga2
- Postfix
- TACACS
- Ansible
- Ansible Automation Platform
- Hardware:
- HPE rack servers
- HPE Synergy blade servers
- Meinberg NTP servers
- Brocade Fibre Channel
- Cisco Nexus 9000
May 2023 - Dec 2023
8 monthsSenior System Engineer Linux
DB Netz AG
- Setting up and updating virtual machines for operational rail infrastructure.
- Software:
- VMWare vSphere 6 – 8
- Veeam Backup
- Microsoft Active Directory (AD), DNS, NPS, WSUS
- RedHat Satellite Server
- rSyslog Server
- Icinga2
- Postfix
- TACACS
- Ansible
- Hardware:
- HPE rack servers
- HPE Synergy blade servers
- Meinberg NTP servers
- Brocade Fibre Channel
- Cisco Nexus 9000
Mar 2023 - Jul 2023
5 monthsSenior System Engineer Linux
PhoenixContact
- Setting up and updating Linux VMs for SAP Application Server and SAP HANA instances.
- Software:
- VMWare vSphere 7 – 8
- Veeam Backup
- SLES for SAP 12 – 15.5
- RHEL 7 – 9
- Ansible
- cfengine
- Microsoft AD and DNS
Jul 2022 - Jun 2023
1 yearSenior IT-Systems Engineer Linux
CITTY Handelsgesellschaft
- Analysis, design, and implementation.
- Software:
- Multi-master Galera cluster for consolidating all MariaDB instances
- Ansible Automation
Jan 2022 - Apr 2022
4 monthsSystem Engineer Linux Application Operations
L-Bank
- Automated deployment of JBoss applications.
- ActiveMQ operations.
- Security patches.
- Monitoring compliance requirements according to the Payment Card Industry Data Security Standard, CERT alerts, crypto alerts.
- Software:
- Nginx
- Apache
- JBoss
- WildFly
- Ansible
- Git
- RedHat AMQ
- Artemis
- Bash
Nov 2021 - Jul 2022
9 monthsSystem Engineer Application Operations Linux Systems
DXC Technology
- Managing JBoss applications.
- Installation at public sector customers.
- Software:
- DXC Webscan
- JBoss
- Ansible
- XML
- Active Directory
- SSO
- Oracle 19
- PostgreSQL
- Check_MK
Jul 2021 - Dec 2021
6 monthsSystem Engineer Linux Systems
ING
- Automating OS upgrades.
- SAP HANA migration and security updates.
- Software:
- RHEL 7 and 8
- SAP HANA
- Ansible
- Bash
- Python
- Ansible
- Git
- VMware ESXi
- Veeam Backup
- Check_MK
Jul 2021 - Sep 2021
3 monthsSystem Engineer Application Operations Linux Systems
Deutsche Rentenversicherung Berlin Brandenburg
- Automating JBoss and Wildfly servers.
- Software:
- Apache
- Tomcat
- Wildfly
- Bash
- Git
Feb 2020 - Jun 2021
1 year 5 monthsSystem Engineer Application Operations Linux Systems
Knappschaft Bahn See
- Automating and operating web and application servers.
- Software:
- SUSE SLES 12
- Apache
- Tomcat 9
- Wildfly
- WebSphere
- Subversion
- Git
- ActiveMQ
- Bash
- Zsh
- Ansible
- Automic
- Python
Oct 2019 - Jun 2024
4 years 9 monthsSystem Engineer Linux Systems
European Media Laboratory
- Automating and operating web and application servers.
- Software:
- OpenShift
- Docker
- Ansible
- Python
- Red Hat Enterprise Linux 6 to 8
- Debian 9 and 10
- Ubuntu 18.04 and 20.04
- Bash
- Git
- Apache
- Nginx
- Tomcat 8
- Wildfly
Oct 2019 - Jan 2020
4 monthsSystem Engineer Application Operations for Linux Systems
Debeka
- Automation and operation of web and application servers.
- Software:
- OpenShift
- Docker
- SLES 12 and 15
- Ubuntu 18.04
- Bash
- Apache
- Nginx
- Tomcat
- Wildfly
- Puppet
- Puppet Bolt
- Ansible
- Python
Aug 2019 - Dec 2019
5 monthsSystem Engineer SAP Systems
BwFuhrparkService GmbH
- Automation and operation of web and application servers.
- Software:
- SuSE Linux Enterprise Server 12 and 15
- Bash
- Ansible
- Python
Jan 2019 - Oct 2019
10 monthsSystem Engineer Application Operations Unix Systems
Schufa Holding AG
- Automation and operation of web and application servers.
- Software:
- OpenShift
- Docker
- Ansible
- Python
- RedHat Enterprise Linux 6 and 7
- Solaris 10
- Bash
- Korn Shell
- Apache
- Nginx
- Tomcat
- Wildfly
Oct 2017 - Oct 2018
1 year 1 monthSystem Engineer Middleware, Monitoring
Consorsbank
- Installation, automation and operation of web application servers.
- Installation and customization of monitoring checks.
- DevOps pipelines.
- Software:
- RedHat Enterprise Linux 6 and 7
- Bash
- JBoss Enterprise Application Platform
- Tomcat
- Apache web server
- ActiveMQ
- Jenkins
- Ansible
- Python
- Icinga2
- Subversion
- Git
Mar 2016 - Dec 2018
2 years 10 monthsSystem Engineer Application Operations Unix Systems
Finanz Informatik Technologie Service
- Installation, automation and operation of web application servers.
- Identity and access management: connecting to LDAP servers, planning and implementing a sudo concept, and rolling out sudo roles.
- Software:
- RedHat Enterprise Linux 6 and 7
- Solaris 10
- Bash
- ksh
- JBoss 6 to Wildfly 9
- WebSphere WAS
- Apache web server
- Ansible
- SAS
- LDAP servers and clients
- Python
Feb 2016 - Feb 2017
1 year 1 monthSystem Engineer Middleware, Linux, zOS
Sparda Datenverarbeitung e.G.
- Installation, automation and operation of web application servers.
- Software:
- RedHat Enterprise Linux 6 and 7
- SUSE SLES 11
- SLES for System z
- JBoss 6 to Wildfly 10
- WebSphere WAS, Liberty and Portal
- Apache web server
- puppet
- Ruby
- hiera
- subversion
- Jenkins
- Git
Aug 2015 - Jan 2016
6 monthsSystem Engineer in Linux Production Systems
FILIADATA / dm-drogerie markt
- Automation of installations and highly available operation of complete environments (web stack, application servers).
- Software:
- RedHat Enterprise Linux 6 and 7
- JBoss 6 to Wildfly 9
- Tomcat 6 and 7
- Apache web server
- nginx web server
- Varnish
- reverse proxies
- puppet
- hiera
- Ruby
- Perl
- foreman
- keepalived
- tanuki
- Icinga2
- jolokia
- Jmx4Perl
- percona
- Galera Cluster
Jan 2015 - Jul 2015
7 monthsSystem Engineer
DZ Bank AG
- Installation and highly available operation of Apache, JBoss, and Tomcat applications.
- Software:
- RedHat Enterprise Linux 6 and 7
- Solaris 10 and 11
- ZFS
- JBoss 4 to 7
- Tomcat 5 to 7
- Apache web server
- reverse proxies
- WatchIT
- UC4
- RedHat Satellite 5 and 6
- Perl
Apr 2014 - Dec 2014
9 monthsSystem Engineer
IBM Global Business Services
- Installation and highly available operation of Apache, JBoss, and WebSphere environments.
- Last Level Support.
- Software:
- RedHat Enterprise Linux 5 and 6
- JBoss
- Tomcat
- WebSphere
- Apache
- Kerberos
- Configuration and deployment framework in Bash and Perl
Sep 2012 - Mar 2014
1 year 7 monthsSystems Design Engineer
Media-Saturn IT-Services
- Installation and highly available operation of JBoss, Tomcat, and ColdFusion environments (Linux).
- Oracle cluster on virtual and physical servers.
- Data center relocation, setting up operations management, setting up Nagios monitoring.
- Software:
- SUSE Linux Enterprise Server
- VMware
- JBoss
- Tomcat
- WebSphere 8.5
- Apache
- Kerberos
- AppDynamics
- ColdFusion 9
- Nagios
- Munin
- Cacti
- F5 load balancer
Jun 2012 - Sep 2012
4 monthsSystems Design Engineer
Sybase 365
- Installation and high-availability operation of JBoss and Tomcat environments on Linux.
- Oracle clustering and troubleshooting.
- Software:
- Red Hat Enterprise Linux
- VMWare
- Kickstart
- Jboss6
- JBoss7
- Tomcat
- Apache
- Apache mod_jk Loadbalancer
- Bash
- Oracle
- Perl
- Python
- Kerberos
Sep 2011 - Jun 2012
10 monthsLinux system administration and operation of Tomcat, JBoss
ORGA GmbH
- Installation and high-availability operation of JBoss and Tomcat environments on Linux.
- Oracle clustering.
- Software:
- Red Hat Enterprise Linux
- PXE-boot
- VMWare
- Jboss4
- JBoss5
- Tomcat
- Apache
- Bash
- Oracle
Jul 2011 - Feb 2012
8 monthsLinux system administration for JBoss
IT.NRW
- Installation and high-availability operation of Oracle RAC, JBoss, and load balancing (Apache) on Linux servers.
- Software:
- Red Hat Enterprise Linux
- AppDynamics
- OpenLDAP
- Puppet
- Chef
- Perl
- PHP
- Kerberos
- VMWare
- Jboss5
- JBoss7
- Tomcat
- Apache
- Bash
- Python
- Fabric
Jan 2011 - Jun 2011
6 monthsLinux system administration
Deutsche Post AG
- Installation and operation of Linux servers for a software testing environment (complex web application).
- Installation and operation of local firewalls as well as automated configuration (Puppet).
- Hardware:
- HP
- Cisco
- NetApp
- Software:
- Red Hat Enterprise Linux
- Ubuntu Linux
- OpenLDAP
- Puppet
- Perl
- PHP
- VMWare
- OpenVZ
- Jboss
- Tomcat
- Postfix
- Bash
- Windows Server
- Exchange
- Lotus Domino
Sep 2010 - Dec 2010
4 monthsLinux system administration
ITSG Informationstechnische Servicestelle der gesetzlichen Krankenversicherung
- Installation and high-availability operation of Linux and Windows servers.
- Deployment of Java software.
- Hardware:
- HP
- Fujitsu
- NetApp
- Software:
- Suse Linux
- Ubuntu Linux
- OpenLDAP
- Perl
- VMWare
- Jboss
- Tomcat
- Windows Server 2003 and 2008
- MS SQL Server 2005 (9.0) and 2008 (10.0)
May 2010 - Aug 2010
4 monthsLinux System Administration
HZD Hessische Zentrale für Datenverarbeitung
- Installation and operation of Linux servers.
- Operation of Oracle Application Server.
- Designing and implementing a Nagios system.
- Hardware:
- Fujitsu
- Software:
- SUSE SLES 9–11
- OpenLDAP
- Perl
- Shell scripts
- Oracle 10
- Nagios
- Icinga
- VMware
- JBoss
- Tomcat
- Windows Server 2003 and 2008
Jan 2010 - Apr 2010
4 monthsUnix System Administration
Vodafone
- Installation and highly available operation of Unix servers and cluster systems according to ITIL.
- Connecting SAN storage and Oracle databases.
- Hardware:
- HP
- IBM
- EMC Clariion
- Symmetrix
- Software:
- HPUX 11
- ServiceGuard
- AIX
- HACMP
- Linux (RHEL 3 and 5)
- OpenLDAP
- Perl
- Oracle Nagios
Feb 2008 - Dec 2009
1 year 11 monthsUnix System Administration
UBS AG
- Installation, operation, and backup/restore of Unix servers and cluster systems in a global team.
- Setup, operation, and relocation of data center, change management, and incident management according to ITIL.
- Hardware:
- SUN
- StorageWorks
- Quantum
- HP
- Fujitsu Siemens
- IBM
- NetApp
- Hitachi
- EMC
- Brocade
- Cisco
- Software:
- Solaris 10
- HPUX 11
- AIX
- Linux (RHEL 3 and 5)
- MAC OSX Server
- NetCool System Monitoring
- Veritas Storage Foundation
- Veritas NetBackup
- ARS Remedy
- HP Open View
- Oracle 10
- MC/ServiceGuard
- NIS
- Kerberos
- LDAP
- DNS
Aug 2007 - Dec 2007
5 monthsAIX System Engineer for IBM p-Series Branch Servers
Dresdner Bank
- Hardware:
- IBM p-Series
- SAN Storage
- Software:
- AIX 4.3 and 5.3
- Development tools, BFF packaging tools
Apr 2007 - Aug 2007
5 monthsUnix System Administration
MAN Turbo AG
- HP cluster for CAD design, IBM p-Series servers for SAP, Linux high-performance cluster for flow simulations
- Hardware:
- IBM p-Series
- HP servers: RISC and Intel Itanium (failover cluster)
- SAN storage
- Software:
- AIX 4.3 and 5.3
- SAP Basis administration
- RHEL 3 and 4
- HPUX 11
- MC/ServiceGuard
- I-Deas CAD software
- ARS Remedy
- Nagios monitoring
Aug 2006 - Mar 2007
8 monthsNetwork administration and system programming
AWEK Mikrodata
- Network infrastructure for a software company and system programming for clients.
- Hardware:
- Intel Server
- Cisco Router
- HP ProCurve Switches
- Software:
- Windows Server 2003
- Linux Server (Debian 3, SLES 10)
- VPN
- Firewall (IP-Tables)
- SAMBA
- Apache
- JBoss
- Tomcat
- Postfix
- SNMP
- Linux kernel adjustments
- Automatic installation routines
Jul 2006 - Jul 2006
1 monthWLAN installation
AWEK Mikrodata
- Access point infrastructure.
- Hardware:
- Cisco Linksys WRT 54G
- Software:
- WEP / WPA
Jun 2006 - Jun 2006
1 monthVoIP router installation
AWEK Mikrodata
- Internet connection for network and telephone.
- Hardware:
- FritzBox Fon 5050
- Software:
- Firewall
May 2006 - May 2006
1 monthTuning for Sun T1 multithreading systems
AWEK Mikrodata
- Tuning application software for the CoolThreads technology of the Sun SPARC T1 servers.
- Hardware:
- Sun UltraSPARC T1 (T1000 and T2000)
- Software:
- Solaris
- Apache
- Sendmail
- MySQL
- Oracle
- JBoss
- Tomcat
- See [link]
Apr 2006 - Apr 2006
1 monthOpenSolaris installation and administration on Intel hardware
AWEK Mikrodata
- Hardware:
- Intel Server
- Software:
- Open Solaris 11
- Sendmail
- Postfix
- Apache
Jul 2005 - Nov 2005
5 monthsAdministration of HP OpenView Data Protector on HPUX Cluster
VSA GmbH
- Online backup of Oracle databases and transaction logs using a complex backup schedule.
- Stabilization of the automatic backup process.
- Training Oracle DBAs to resolve minor issues.
- Repair of hardware failures together with HP service.
- Repair of software issues together with HP service.
- Hardware:
- HP 9000 N-class Cluster, A-class
- HP VA7410
- Cisco Catalyst 3750G switches
- Brocade SAN Switch
- HP SureStore Tape Library
- Software:
- HP UX 11i
- HP Open View
- HP Data Protector
- Oracle RMAN
Jul 2005 - Jul 2005
1 monthInstallation of HP OpenView Data Protector on HPUX Cluster
VSA GmbH
- Replacement of the existing OmniBack software with the latest version of HP-Data-Protector.
- Migration of the extensive backup logs.
- Setup of the HP tape robot.
- Configuration of automated email notifications.
- Hardware:
- HP9000 N-class Cluster, A-class
- HP VA7410
- Cisco switches 3750G, 3560, 2960
- Brocade SAN Switch
- HP SureStore Tape Library
- Software:
- HP-UX 11i
- HP Open View
- HP Data Protector
- Oracle RMAN
Jun 2005 - Jun 2005
1 monthInstallation of Oracle 9 for the development department
VSA GmbH
- Test database for software development.
- Simulation of billing runs.
- Hardware:
- Intel server (FSC)
- Software:
- Oracle 9
- JBoss
- Tomcat
- Java
Jun 2005 - Jun 2005
1 monthSoftware development for online data service
VSA GmbH
- Bidirectional data transfer over the Internet.
- Software:
- Perl
- Java
- WebDAV
- XML
- Apache
- Tomcat
May 2005 - May 2005
1 monthServer installation
VSA GmbH
- Use of Scientific Linux as a free RHEL clone.
- Hardware:
- Intel server
- Software:
- Scientific Linux 4.1 (RHEL Clone)
- DNS
- DHCP
- Firewall
- Apache
- MySql
- Squid
- Samba
- Postfix
Apr 2005 - Apr 2005
1 monthNFS Administration
VSA GmbH
- Set up automount connections via NFS.
- Hardware:
- HP9000
- Intel server
- Software:
- HP-UX
- Linux
- NFS
- Automount
Apr 2005 - Apr 2005
1 monthNokia Firewall Hardware Replacement
VSA GmbH
- Took over and extended the firewall settings.
- Hardware:
- Nokia 500s
- Nokia Firewall
- Cisco PIX 520
- Software:
- FreeBSD
- CheckPoint FireWall1
Mar 2005 - Mar 2005
1 monthCitrix Client Update Rollout
VSA GmbH
- Updated all clients uniformly to version 8.
- Hardware:
- Intel server farm (for 1200 workstations)
- Cisco Catalyst 3750G switches
- Software:
- Citrix
- Windows 2003 Server
Mar 2005 - Mar 2005
1 monthSUSE Cluster Deployment and Commissioning
VSA GmbH
- Set up and commissioned a fault-tolerant server for the software development department, software testing, nightly builds, and backup server integration.
- Hardware:
- Server FSC Primergy RX300
- FSC FibreCAT S80
- Cisco Catalyst 3560 switches
- Software:
- SUSE SLES9
- Heartbeat
- Perl
- Java SDK
- PaperCut
- Phorum
- Apache
- Bugzilla
- Webmin
- HP Data Protector
- Oracle
Feb 2005 - Feb 2005
1 monthADS Data Entry
VSA GmbH
- Added user data.
- Modified existing permissions for the new file server directory structure.
- Hardware:
- Intel server
- Software:
- Windows 2003 Server
- ADS
Feb 2005 - Feb 2005
1 monthBig-Brother Network Monitoring Extension
VSA GmbH
- Add new servers and network services (Perl).
- Expand the menu (JavaScript).
- Create and display throughput statistics with MRTG.
- Integrate remote consoles (Java).
- Send status messages via email (Perl).
- Hardware:
- Intel servers
- Sun SPARC servers
- HP9000 RISC servers
- Diesel generator
- Security cameras
- Software:
- BigBrother
- Apache
- PHP
- Java
- JavaScript
- MRTG
- Postfix
- Perl
Feb 2005 - Feb 2005
1 monthAccess Control Extension
VSA GmbH
- Install new access terminals.
- Hardware:
- Interflex IF 600 / 610
Feb 2005 - Feb 2005
1 monthHP VA7400 Firmware Update
VSA GmbH
- Copy new firmware to disk controllers and disks.
- Hardware:
- HP9000 N-Class and A-Class clusters
- HP VA7410
- Brocade SAN switch
- Software:
- HP-UX 11i
- HP OpenView cluster packages
- HP Data Protector
- Oracle RMAN
Feb 2005 - Feb 2005
1 monthDevelopment Server Installation
VSA GmbH
- Set up and commission a development test server for software testing.
- Nightly builds, status messages via email (Perl script).
- Hardware:
- FSC Primergy RX100 server
- Software:
- SUSE SLES9
- Java SDK
- Perl
- Apache
- JBoss
- Tomcat
Feb 2005 - Feb 2005
1 monthSoftware Development for Periodic Data Retrieval at a Wholesaler
VSA GmbH
- Adjust firewall, generate emails via Perl script.
- Hardware:
- Server
- Software:
- HP-UX
- Linux
- NFS
- FTP
- iptables
- wget
- Shell scripts
- Perl
Jan 2005 - Nov 2005
11 monthsMail System Administration
VSA ApothekenSysteme GmbH
- Internal mail system Microsoft Exchange, connections to the internet using mail proxies, redundant setup.
- Hardware:
- Intel Server Cluster
- SAN Storage System
- F5 BIG-IP Load Balancer
- Cisco Switches Catalyst 2960
- Cisco PIX 520 Firewall
- Redundant internet connection
- Software:
- Exchange 2003
- Postfix
- Apache
- Trend Micro Virus Wall
- Greylisting spam filter
Jan 2005 - Jan 2005
1 monthExchange Mail Cluster
VSA GmbH
- Setup and commissioning of Exchange 2003, migration of mailboxes.
- Hardware:
- FSC Primergy RX300 server
- FSC FibreCAT S80
- Cisco Switches Catalyst 2960
- Software:
- Windows 2003 Cluster Server
- Exchange 2003
Jan 2005 - Jan 2005
1 monthJava Software Development
VSA GmbH
- Development of software modules for an inventory management system.
- Integration of receipt printers and card readers.
- Software:
- Eclipse 3
- Tomcat
- JBoss
May 2002 - Sep 2005
3 years 5 monthsSolaris Server Administration
VSA GmbH
- Ensuring availability and functionality.
- Authenticating users using PKI for a web portal.
- Supporting software development (PKI).
- Hardware:
- SPARC servers
- Software:
- Solaris
Jan 2002 - Nov 2005
3 years 11 monthsHP Cluster / Oracle Database System Administration
VSA GmbH
- Ongoing administration, troubleshooting, hardware expansion.
- Hardware:
- HP 9000 N-class cluster
- A-class development servers
- HP VA7410
- Cisco Switches Catalyst 6509, 3750G
- Brocade SAN switch
- HP SureStore tape library
- Software:
- HP-UX 11i
- MC/ServiceGuard
- HP OpenView
- Oracle
- SuSE Linux Enterprise Server 9
- JBoss
- Tomcat
- Java application software
Summary
I have over 15 years of hands-on experience in Linux and Unix system administration, system programming in various scripting languages, and web administration. Since starting my career as an IT freelancer in 2006, I have built and maintained high-availability environments using tools like Apache, Nginx, Ansible, and Puppet, among many others.
I bring extensive expertise in automating environments with CI/CD pipelines and managing complex systems for critical applications. I also have a solid background in infrastructure management and system updates, ensuring reliable operation in diverse industries while always expanding my technical skills through new challenges.
Languages
German
NativeEnglish
IntermediateEducation
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Technician · Electrical Engineering
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