Karsten Rehberg - Linux Support Engineer with 28 Years

🚀 FRATCH GPT 2.0 - Find freelancers with a single prompt. With rate benchmark.

Recommended expert

Riesa, Germany

Check rate

Experience

Jan 2023 - Present

3 years 10 months

Support Specialist

Bertelsmann SE

Jan 2023 - Present

3 years 10 months

Support Specialist

Bertelsmann SE & Co. KGaA

Customer support for in-house applications MBSE and B2B
Operation of applications in-house, in Azure, and on customer infrastructure
Containerization and deployment automation with Ansible

Jan 2022 - Dec 2023

2 years

DevOps

Mercedes-Benz AG

Jan 2022 - Dec 2023

2 years

Operations Engineer

Mercedes-Benz Tech Innovation GmbH

Support for the PaaS Cloud Foundry
Migration of the infrastructure to AWS
Automation with Ansible

Jan 2021 - Dec 2022

2 years

DevOps

Bertelsmann SE & Co. KGaA

Deployment and operation of in-house applications SXP, B2B
Application management and operation of third-party software
Automation and monitoring
Administration of Kafka, Redis

Jan 2020 - Dec 2022

3 years

DevOps

Bertelsmann SE & Co. KGaA

Jan 2019 - Dec 2020

2 years

System Administration

Comdirect Bank AG

Data center operations
Linux administration, L3 support
Automation with Ansible, refactoring of existing scripts (Bash, Python)
Migration of business applications during the OS upgrade from RHEL 6 to 7
Operation and improvement of patch management

Jan 2019 - Dec 2020

2 years

Redhat Administration

comdirect Bank AG

Jan 2019 - Dec 2019

1 year

System Administration

Provinzial NordWest Holding AG

Migration from SLES to RHEL
Linux administration, day-to-day support
Automation with Jenkins
Automation and integration of Azure VMs
Migration of Tomcat VMs to Docker

Jan 2017 - Dec 2018

2 years

Software Development

Itelligence / SAP

Jan 2017 - Dec 2018

2 years

Software Development

Itelligence / SAP SE

Automation of server and landscape setup in the SaaS Cloud
Linux administration, L3 Support
Setup of the Converged Cloud and server management
L3 Support in the HEC (Hana Enterprise Cloud)
Refactoring of monitoring

Jan 2016 - Dec 2017

2 years

Software Developer

AMTC Dresden

Jan 2016 - Dec 2016

1 year

Software Development

AMTC Dresden

Expansion of a Perl library
Adaptation of existing data to the changing machine formats
Machine automation with Perl and Java

Jan 2015 - Dec 2016

2 years

Linux Administration

EWERK Leipzig

Jan 2015 - Dec 2015

1 year

Administration of Linux Systems and Customer Applications

eWerk IT GmbH

Administration, deployment and monitoring in Unix/Linux environments
Support for customers with technical issues and inquiries
Documentation of IT support processes, customer inquiries and incident reports
Project work on-site for customers and technical consulting
Continuous optimization of the Linux server landscape
Installation, configuration and administration of highly available server systems
Automation of administration and processes through scripting

Jan 2014 - Dec 2014

1 year

Embedded Systems Programming

DORMA GmbH

Feasibility study on the use of embedded systems
Programming software for processing optical scanner signals
Design of the central database
Network design (subnet routing, packet filtering)
Development of admin scripts for monitoring and controlling the systems

Jan 2010 - Present

16 years 10 months

Cluster Administration

GDF SUEZ EP

Administration of a Megware supercomputer for seismic calculations
Configuration and optimization of cluster software
Installation and management of Linux clients
Support for client software in the processing area
Liaison between the department and IT, advising both departments
Development and further development of tools and scripts for the department
Implementation of the trouble ticket system (data migration, plugin programming, server administration)

Jan 2010 - Dec 2015

6 years

Linux Cluster Administration

GDF SUEZ EP

Jan 2008 - Dec 2010

3 years

Customer Application Installation

IBM Business Service GmbH

Set up the system environment for Gematik GmbH (health card)
Support during functional tests and commissioning
Development of shell scripts for automated installation, monitoring, and administration

Jan 2007 - Dec 2010

4 years

Unix Administrator

IBM Deutschland GmbH

Jan 2007 - Dec 2008

2 years

Data Center Migration, Application Installation, 3rd Level Support

IBM Business Service GmbH

Installation and configuration of customer applications
Configuration of operating systems and system-related services
Automating installation using shell and Perl scripts
Troubleshooting and system analysis
Performance measurements
3rd Level Support
Server documentation and handover to operations
Change Management

Jan 2006 - Dec 2007

2 years

Incident Manager

O3SIS IT AG

Jan 2006 - Dec 2007

2 years

Software Development, 3rd Level Support

O3SIS IT AG

3rd Level Support and system analysis
Development of tools and participation in software projects
Creation of reports and automation of reporting

Jan 2005 - Dec 2006

2 years

Administrator

Landratsamt Riesa

Administration of Linux and Windows servers, expansion of the IT infrastructure (setup of a subnet)
Development of a mail server (Debian/Sendmail/Cyrus) and firewall (Debian/Squid/IPTables)

Jan 2000 - Dec 2003

4 years

System Administrator

SEB Invest

Jan 2000 - Dec 2003

4 years

User Help Desk, 1st and 2nd Level Support

SEB-Invest

Worked in a User Help Desk, 1st and 2nd Level Support
Installation of clients, management of SQL/Oracle servers and application servers
Software development, development of smaller applications and tools
Support for the Organizer product area

Jan 2000 - Dec 2000

1 year

User Help Desk

Investitionsbank Berlin

Support staff in a User Help Desk, answering calls, qualifying and solving user problems by phone or remotely
Administration of the Windows NT clients in use
Coordination of relocations within the group

Jan 1999 - Dec 1999

1 year

RollOut

Bankgesellschaft Berlin

Rollout of clients in the banks' office building, productive commissioning of the IT infrastructure
Client configurations

Jan 1998 - Dec 2000

3 years

Network Technician

Freelance work

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Energy, Information Technology, Media and Entertainment, Banking and Finance, Automotive, and Aerospace and Defense.

Energy

Information Technology

Media and Entertainment

Banking and Finance

Automotive

Aerospace and Defense

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Operations, Customer Service, Product Development, Quality Assurance, and Production.

Information Technology

Operations

Customer Service

Product Development

Quality Assurance

Production

Summary

Expert knowledge: Linux and Perl
Basic knowledge: Docker, databases (MySQL, PostgreSQL), software development (Python, Java), IT security

Languages

German

Advanced

Education

Wilhelm Büchner Hochschule

Bachelor of Science · Computer Science · Germany

Universität Dresden

Civil Engineering · Dresden, Germany

Stahlwerk Riesa

Industrial Electronics Technician · Riesa, Germany

Statistics

Experience

Total positions 29

Experience in Energy 17 y

Avg length 2 y 10 m

Longest experience 16 y 9 m

Expertise

Recent roles Support Specialist, DevOps, Operations Engineer

Main industries Energy, Information Technology, Media and Entertainment

Main business areas Information Technology, Operations, Customer Service

Qualifications

Highest degree Doctorate

Member since

October 2025

Last update

October 2026

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Have questions? Find more information here.

Karsten is based in Riesa, Germany and can operate in on-site, hybrid, and remote work models.

Karsten speaks the following languages: German (Advanced).

Karsten has at least 28 years of experience. During this time, Karsten has worked in at least 23 different roles and for 23 different companies. The average length of individual experience is 1 year and 11 months. Note that Karsten may not have shared all experience and actually has more experience.

Based on recent experience, Karsten would be well-suited for roles such as: Support Specialist, DevOps, Operations Engineer.

Karsten's most recent position is Support Specialist at Bertelsmann SE.

In recent years, Karsten has worked for Bertelsmann SE, Bertelsmann SE & Co. KGaA, Mercedes-Benz AG, Mercedes-Benz Tech Innovation GmbH, and GDF SUEZ EP.

Karsten is most experienced in industries like Energy, Information Technology, and Banking and Finance. Karsten also has some experience in Media and Entertainment, Automotive, and Aerospace and Defense.

Karsten is most experienced in business areas like Information Technology, Operations, and Customer Service. Karsten also has some experience in Quality Assurance, Product Development, and Production.

Karsten has recently worked in industries like Energy, Media and Entertainment, and Automotive.

Karsten has recently worked in business areas like Information Technology, Operations, and Customer Service.

Karsten holds a Doctorate in Civil Engineering from Universität Dresden and a Bachelor in Computer Science from Wilhelm Büchner Hochschule.

The availability of Karsten needs to be confirmed.

Daily rate distribution

0% 25% 50% 75% 100%

<€640 €640-720 €720-800 €800-880 €880-960 €960-1040 €1040+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

1000

750

500

250

Daily rate avg. 850 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000

750

500

250

Median rate 820 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 30 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.