Sebastian Dörr-Willken - Senior IT System Administrator

Q: Where is Sebastian based?

Sebastian is based in Fulda, Germany .

Q: What languages does Sebastian speak?

Sebastian speaks the following languages: German (Native), English (Advanced), Spanish (Elementary), French (Elementary) .

Q: How many years of experience does Sebastian have?

Sebastian has at least 25 years of experience. During this time, Sebastian has worked in at least 17 different roles and for 18 different companies . The average length of individual experience is 1 year and 4 months . Note that Sebastian may not have shared all experience and actually has more experience.

Q: What is Sebastian's latest experience?

Sebastian's most recent position is Senior IT System Administrator at LKA Thuringia .

Q: What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for LKA Thuringia , Siemens HR , Digicom , and Semantic Applications GmbH & Co. KG .

Q: Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology , Manufacturing , and Banking and Finance . Sebastian also has some experience in Transportation , Automotive , and Government and Administration .

Q: Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology , Operations , and Strategy . Sebastian also has some experience in Project Management and Audit .

Q: Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Information Technology , Manufacturing , and Government and Administration .

Q: Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Operations , Strategy , and Information Technology .

Recommended expert

Fulda, Germany

Experience

Dec 2020 - Present

5 years 4 months

Senior IT System Administrator

LKA Thuringia

Mar 2020 - Present

6 years 1 month

Senior IT System Administrator

Siemens HR

Jan 2018 - Dec 2018

1 year

Senior Database Engineer

Lowell Group

Jan 2016 - Dec 2019

4 years

Senior IT System Administrator

DekaBank

Dec 2015 - Present

10 years 4 months

Trainer Exadata Administration Workshop

Digicom

Oct 2015 - May 2016

8 months

On-site

IT Onsite Coordinator for Oracle Applications

Tech Mahindra

Jun 2015 - Dec 2016

1 year 7 months

Senior Oracle DBA

Continental AG

Mar 2015 - Apr 2015

2 months

Senior Consultant for Due Diligence Oracle

TechM

Jan 2014 - Dec 2015

2 years

Senior Exadata Administrator

Commerzbank AG

Apr 2013 - Oct 2013

7 months

Senior DBA Horizontal Database Group

Credit Suisse

Jan 2013 - Dec 2014

2 years

Senior Application DBA

Deutsche Bahn AG

Dec 2012 - Jun 2013

7 months

Oracle Database Administrator

ePost GmbH

Jan 2012 - Present

14 years 3 months

Managing Director

Semantic Applications GmbH & Co. KG

Headquartered in Fulda, Germany, with an international division in Našice, Croatia
Team members in Germany: 6
Team members in Croatia: 9

Jan 2012 - Dec 2012

1 year

Technical Project Lead

Daimler AG

Jul 2011 - Nov 2011

5 months

Systems Database Engineer

DVB Bank SE

Jan 2008 - Dec 2011

4 years

Oracle DBA and Backup Teamlead

HP Enterprise Services GmbH

Jan 2005 - Dec 2007

3 years

Systems Administrator Data Center Europe

Goodyear Luxembourg Tires SA

Oct 2004 - Mar 2005

6 months

Internship Systems Administrator Data Center Europe

Goodyear Luxembourg Tires SA

Jan 2001 - Dec 2004

4 years

BA-Student (University of Cooperative Education Gera)

Deutsche Post IT Solutions

Industry Experience

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

Experienced in Information Technology, Manufacturing, Banking and Finance, Transportation, Government and Administration, and Automotive.

Information Technology

Manufacturing

Banking and Finance

Transportation

Government and Administration

Automotive

Business Area Experience

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

Experienced in Information Technology, Operations, Strategy, and Project Management.

Information Technology

Operations

Strategy

Project Management

Skills

Programming Languages

Pl/sql
Shell Programming
Python Scripting
Powershell Scripting

Databases

Oracle
Oracle Rac
Oracle Data Guard
Oracle Performance
Oracle Streams
Mssql Server (2000/2008/2012/2016)
Sybase
Mysql
Postgresql (Postgres)

Tools & Platforms

Gitlab
Toad
Sql Developer
Ms Project
Confluence
Jira
Ms Office
Sap
Informatica (Power Center)
Gridcontrol
Cloudcontrol
Goldengate
Netapp
Docker
Kubernetes
Ansible
Sccm
Scom
Elk
Tws
Automic

Operating Systems

Unix (Aix, Hp-ux, Solaris, Linux)
Windows Server (2000/2003/2008/2012/2016)

Cloud & Infrastructure

Aws
Exadata
Exalogic

Networking & Security

Network And Firewall
Oid
Oracle Database Security
Backup/recovery
Disaster Recovery (Dr) And High Availability (Ha)

Project & Process Management

Team Lead
Project Management
Itil Change Management
Itil Incident Management
Itil Problem Management
Operational Management
Job Scheduling
Scrum
Process Improvements

Languages

German

Native

English

Advanced

Spanish

Elementary

French

Elementary

Education

Oct 2001 - Jun 2004

University of Cooperative Education Gera

Bachelor's Student · Gera, Germany

Certifications & licenses

Oracle Certified Professional 10g

ITIL Certificate v3

Statistics

Experience

Total positions 19

Experience in Information Technology 22 y

Avg length 3 y 2 m

Longest experience 14 y 2 m

Expertise

Recent roles Senior IT System Administrator, Senior Database Engineer, Trainer Exadata Administration Workshop

Main industries Information Technology, Manufacturing, Banking and Finance

Main business areas Information Technology, Operations, Strategy

Qualifications

Highest degree Bachelor

Certifications earned 2

Profile

Created

September 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Sebastian based?

Sebastian is based in Fulda, Germany.

What languages does Sebastian speak?

Sebastian speaks the following languages: German (Native), English (Advanced), Spanish (Elementary), French (Elementary).

How many years of experience does Sebastian have?

Sebastian has at least 25 years of experience. During this time, Sebastian has worked in at least 17 different roles and for 18 different companies. The average length of individual experience is 1 year and 4 months. Note that Sebastian may not have shared all experience and actually has more experience.

What roles would Sebastian be best suited for?

Based on recent experience, Sebastian would be well-suited for roles such as: Senior IT System Administrator, Senior Database Engineer, Trainer Exadata Administration Workshop.

What is Sebastian's latest experience?

Sebastian's most recent position is Senior IT System Administrator at LKA Thuringia.

What companies has Sebastian worked for in recent years?

In recent years, Sebastian has worked for LKA Thuringia, Siemens HR, Digicom, and Semantic Applications GmbH & Co. KG.

Which industries is Sebastian most experienced in?

Sebastian is most experienced in industries like Information Technology, Manufacturing, and Banking and Finance. Sebastian also has some experience in Transportation, Automotive, and Government and Administration.

Which business areas is Sebastian most experienced in?

Sebastian is most experienced in business areas like Information Technology, Operations, and Strategy. Sebastian also has some experience in Project Management and Audit.

Which industries has Sebastian worked in recently?

Sebastian has recently worked in industries like Information Technology, Manufacturing, and Government and Administration.

Which business areas has Sebastian worked in recently?

Sebastian has recently worked in business areas like Operations, Strategy, and Information Technology.

What is Sebastian's education?

Sebastian holds a Bachelor from University of Cooperative Education Gera.

Does Sebastian have any certificates?

Sebastian has 2 certificates. These include: Oracle Certified Professional 10g and ITIL Certificate v3.

What is the availability of Sebastian?

Sebastian is immediately available for suitable projects.

What is the rate of Sebastian?

Sebastian's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.