Klaus Weltermann - Interim Data Center Director, Berlin

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Kassel, Germany

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Experience

Sep 2024 - May 2025

9 months

Berlin, Germany

Interim Manager: Head of Data Centers

Stromnetz Berlin

Management of the data centers and the employees
Ensuring and further developing operations
Training a successor and handing over responsibility

Jul 2023 - May 2024

11 months

Interim Manager: Head of IT

Managing the IT department as interim manager
Searching for a successor and introducing the successor to the role

May 2022 - Dec 2022

8 months

Project Manager / Interim Manager

Investment sector

Took over provider management for a period of more than half a year
Planning, execution, and successful completion of projects in the UC area

Oct 2021 - Apr 2022

7 months

Project Manager

IT service provider in the banking sector

Introduction of a SAM system for a large credit institution
Leading a preliminary study for another institution

Jun 2021 - Sep 2021

4 months

Project Manager

Planning and introduction of a new communication system as a replacement for telephony and video conferencing technology as part of a corporate restructuring
Implementation for the company headquarters and company locations

Nov 2019 - Oct 2020

1 year

Project Manager

Real estate industry

Introduction of a new UC communications platform for a large mid-sized company
Transfer of the production platform into regular operations after a test phase
Project management of the projects as well as support in the realignment of the IT department

Feb 2019 - Jul 2019

6 months

Project Manager

ISS

Set up a large, fully geo-redundant Skype for Business platform for a large company in the services sector
Implementation of a series of call centers including IVR functionalities
Conversion and transition from a data center to a geo-redundant data center network
Relocation of the data center to a new location, demolition of the old data center and planning of the new build as well as planning of the new platform through to completion

Oct 2018 - Jan 2019

4 months

Consultant

Automotive supplier industry

Support in the search for an IT manager
Advice on day-to-day IT operations
Induction of the new IT manager

Nov 2017 - Jun 2018

8 months

Request Manager

BASF

Coordination, management and planning of the global expansion and redesign of the data network (WAN / LAN / WLAN) as part of daily business

Mar 2017 - Sep 2017

7 months

Project Manager

TENNET

Planning and coordination of IT-related topics for the relocation of a corporate headquarters for a large energy service provider
Planning and monitoring the setup of the IT infrastructure as well as planning the WLAN network
Relocation planning including the replacement of workplace equipment
Migration to O365
Relocation of the local data center to the new building

Nov 2016 - Mar 2017

5 months

Germany

Consultant

Deutsche Post DHL

Preparation of a feasibility study on behalf of the CEO with a focus on IT security
Consideration of feasibility, cost-benefit ratio, and compliance with all security aspects

May 2016 - Sep 2016

5 months

Germany

Transition Manager

Deutsche Bank

Transfer of a business unit to an Indian outsourcing provider
Taking on the roles of transition manager and project manager

Nov 2015 - May 2016

7 months

Germany

Expert

TÜV Rheinland

Work as an expert in the area of data centers and networks

Jan 2015 - Oct 2015

10 months

Germany

Interim Manager / Project Manager

AS Schulman

Management and responsibility for IT operations and the local helpdesk
Planning and execution of the office move of the Germany headquarters as well as the relocation of the data center
Rebuild of the campus network as well as planning and setup of the WLAN network
Mail and software migration to MS Office 365 and Skype for Business
Responsibility for IT services in Germany, including personnel responsibility
Software migration and rollout to Office 365

Jun 2014 - Nov 2014

6 months

Germany

Consultant / Project Manager

BAYER AG

Process consulting and introduction of operational processes for user provisioning and administration
Development and introduction of a new operating concept with processes for a special group of IT users

Aug 2013 - Dec 2016

3 years 5 months

Germany

Consultant / Expert

TÜV Rheinland

Various roles as consultant and expert
Advising a company in the automotive industry on building a secure IT infrastructure
Auditing an outsourcing data center for an outsourcing provider
Advising and supporting a large energy service provider in building an operations organization
Supporting the preparation of tenders under EU law

Jun 2013 - Aug 2013

3 months

Consultant

COMPUTACENTER

Advising a systems house on setting up a service center as part of an outsourcing contract
Creating concepts for the organizational setup and reporting for the customer support area of a large telecommunications business
Coordinating Service Level Agreements (SLA) with the customer

Jan 2013 - May 2013

5 months

Germany

Project Manager

Deutsche Post Group

Leading a virtualization project for the complete virtualization of a data center based on VMware
Preparing the data center move, including hardware procurement and step-by-step migration of systems to the new platform

Jul 2011 - Jun 2012

1 year

Project Manager

BP Europe SE / ATOS

Rebuilding the power supply of a data center to a technically up-to-date standard as part of a multi-stage concept
Sequential rebuilding of the power supply of a mission-critical data center during live operation without any loss of availability
Leading the project team and negotiating with internal and external service providers
Creating, coordinating, and executing the project plan
Responsibility for the change process, taking SLA requirements into account

Jan 2011 - Apr 2011

4 months

Project Manager

Vodafone Global

Creating and executing a plan of measures to improve service for a large international IT platform (web, email)
Leading subcontractors and ensuring and tracking SLA / OLA compliance

Jun 2010 - Dec 2010

7 months

Interim Management: Business2IT – Alignment

European Airline

Responsibility for IT operations in the areas of flight operations and maintenance
Transition management and leadership of outsourcing service providers
Negotiation and monitoring of SLAs

Jun 2009 - Mar 2010

10 months

Interim Management: Head of Competence Center and Department

Fiducia

Set up and led a competence center for operating an IT platform for a large investment bank with around 40 employees
Recruiting, building up know-how, and introducing processes
Managing the interface with the customer
Building the IT infrastructure and gradually taking over the services into our own data center during ongoing operations
Responsibility for budget, staff, and SLAs

Jan 2009 - Apr 2009

4 months

Project Manager

TELEFONICA

Assumed operations of 3rd-level support at a large telecommunications company (DSL provider)
OLA negotiations and support organization
Process design and organization of employee training

Nov 2008 - Jan 2009

3 months

Consultant

DB SCHENKER

Consulting on the restructuring of a service organization at a logistics company
Assessment of the current situation and support with all questions related to the restructuring

Mar 2008 - Sep 2008

7 months

Germany

Release Manager / Consultant

Deutsche Bahn

Release management for a commercial billing system of a large transport and logistics group
Introduction of a new commercial billing system in 3-tier technology
Creation of release planning, escalation management, and monitoring of the implementation project
Ensuring compliance with SLAs

May 2007 - Oct 2007

6 months

Project Manager / Consultant

BWI-IT

Development of a concept and management of a rollout for a large public-private partnership project
Representing the interests of the CIO organization during the rollout of IT infrastructure
Building the infrastructure from scratch as well as rolling out IT network technology and TELCO network
Connecting the infrastructure to outsourcing service providers

Feb 2007 - Mar 2007

2 months

Consultant

VODAFONE

Interface audit for an outsourcing project of a large German mobile network operator
Audit and review of interfaces to the outsourcing provider as well as negotiation of new interfaces and access rights
SLA negotiations

Jun 2006 - Jan 2007

8 months

Germany

Interim Manager: Head of the Internet Data Center

T-Mobile

Leading the data center and ensuring operations with about 40 employees
Introduction of processes and the REMEDY tool
Negotiations with suppliers and upgrade of a new subscriber database

Oct 2005 - Mar 2006

6 months

Germany

Interim Manager: Head of Competence Center

State of Hesse

Development of an operating concept for a newly founded IT Competence Center for the Hessian police and management as interim manager
IT coordination for the 2006 FIFA World Cup

Mar 2005 - Sep 2005

7 months

Project Manager

Provider in the Defense / National Security sector

Project management and leadership of sub-suppliers in the area of Homeland Security (Border Crossing Points, Blue Border)

Apr 2004 - Dec 2004

9 months

Germany

Project Manager: Implementation of a new APN strategy

o2

Planning for the implementation of the strategy and transition management for a large German mobile provider
Leading the project team (approx. 30 employees), escalation management, and negotiations with suppliers
Milestone planning, resource coordination, and reporting
Relocation of server infrastructure as well as acceptance and handover of the systems to operations

Jan 2004 - Apr 2004

4 months

Germany

Project Manager: Switching center software upgrade

o2

Software upgrade at all German switching centers of a large German telecommunications provider
Leading the project team and negotiations with suppliers
Planning project milestones, resource coordination, and documentation
Acceptance of the solution and handover to operations

Jan 2003 - Dec 2003

1 year

Germany

Project Manager: Type approval project

VODAFONE

Acceptance of new components of the transport network before introduction into operations
Leading the project team (approx. 20 employees) as well as defining the project plan and resources
Defining test requirements and coordination with the manufacturer
Reporting, documentation, and handover of the results to the customer

Jan 2003 - Mar 2003

3 months

Consultant

Insurance company

Consulting on the restructuring of an IT service department at an insurance company

Jan 2000 - Dec 2002

3 years

Head of Operations (department head)

EINSTEINet AG

Setup of the Hamburg data center and management of operations for EINSTEINet Data Center
From the ground up, management of telephone and data network operations, the web farm, the Windows 2000 / Citrix cluster, and the Customer Care organization
Staff build-up and responsibility for approx. 130 employees, including setting up shift operations
Business process modeling and setup of the call center area with the Remedy tool
Contract negotiations with customers and suppliers as well as participation in framework agreements for ASP / outsourcing
Reporting to investors and the supervisory board
License management with software vendors within the ASP license model
Responsibility for operations as an outsourcing service provider

Jan 1998 - Dec 2000

3 years

Head of IT / Operations / Infrastructure & Head of System Operations and Networks

OBI Baumärkte / Gesellschaft für Datenverarbeitung mbH

Led IT for the OBI Group (approx. 70 employees) and managed outsourcing partners
Introduced an AS/400 environment and migrated SAP R/3 systems from AIX to NT with Oracle DB
Built an SAP R/3 system for Eastern Europe / Asia as part of an insourcing project
Modeled business processes for the support and operations area and introduced internal SLAs
Successful Y2K transition of the corporate infrastructure and data center relocation
Budget responsibility of approx. DM 30 million
Built a data warehouse system based on NCR Teradata
Responsible for the OBI Group's international transport network
Responsible for 1st / 2nd / 3rd level support in the client/server environment
Rollout of new IT employee workstations as part of the Y2K project
Concept for the insourcing of an ERP system

Jan 1996 - Dec 1999

4 years

Germany

Head of Field Service International & Technical Director Frankfurt

Lufthansa AG / Lufthansa Systems GmbH

Led up to 50 employees professionally and disciplinarily
Headed Lufthansa's international IT service as department manager with budget responsibility of DM 12 million
Global rollout project for Lufthansa Cargo and rollout of client/server infrastructure for Lufthansa Italy
Built the Frankfurt branch and led it as head of profit center
Negotiated the outsourcing contract and built the operation of a large server farm for Commerzbank AG
Developed a restructuring concept for the operations area of a customer in the savings bank sector

Various Assessments / Short-term Activities

Various consulting assignments and preparation of expert reports

Germany

Professional Experience

IBM Deutschland GmbH

Supported customers in the mid-market environment with AS/400 and AIX systems on the basis of several fixed-term contracts

Industry experience

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

Experienced in Information Technology, Aerospace and Defense, Energy, Telecommunication, Automotive, and Retail.

Information Technology

Aerospace and Defense

Energy

Telecommunication

Automotive

Retail

Business area experience

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

Experienced in Information Technology, Operations, Project Management, Procurement, Audit, and Legal.

Information Technology

Operations

Project Management

Procurement

Audit

Legal

Skills

Data Center Infrastructure, It Security, Migrations, Remediation, Cloud Infrastructure
Wan, Lan - Networks For All Available Infrastructures
Ipv6 Migration
Basic It Protection According To Bsi (Din 27001)
Setup / Move / Rebuild / Consolidation Of Data Center Infrastructure
Business Process Modeling / Itil V3
Contract Negotiations With Suppliers / Customers
Management Of Service Providers / Suppliers
Building / Restructuring Of It Organizations
From Customer Care / Helpdesk
/ Service Management Through Data Center Operations To On-Site Service According To Itil
Creating Service Level Agreements (Sla)
Introduction Of Processes
License Management / License Models
Creating Requirement Catalogs And Sow Documents
Staff Development / Management In It
Rollout Projects
Outsourcing / Insourcing Of It Operations
Relocation Of Data Centers / Server Infrastructure
Project Management According To Gpm - Ipma / Prince 2
Hp Sc, Jira, Ms Teams + Office, Swyx, Webex, Jabber, Zoom, Ms Project
C, C++, Assembler, Pascal, Shell

Languages

German

Native

English

Advanced

Education

University of Kassel

Graduate Engineer in Electrical Engineering, specialization in Communications Engineering · Electrical Engineering · Kassel, Germany

Certifications & licenses

Driver's license classes A

Driver's license classes BE

Driver's license classes CE

Class B authorization

Federal Office for Telecommunications Licensing

Statistics

Experience

Total positions 39

Experience in Information Technology 10.5 y

Avg length 9 m

Longest experience 3 y 11 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Interim Manager: Head of Data Centers, Interim Manager: Head of IT, Project Manager / Interim Manager

Main industries Information Technology, Aerospace and Defense, Energy

Main business areas Information Technology, Operations, Project Management

Qualifications

Highest degree Bachelor

Certifications earned 4

Profile

Member since

August 2025

Last update

August 2026

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Frequently asked questions

Have questions? Find more information here.

Klaus is based in Kassel, Germany.

Klaus speaks the following languages: German (Native), English (Advanced).

Klaus has at least 24 years of experience. During this time, Klaus has worked in at least 23 different roles and for 32 different companies. The average length of individual experience is 1 year and 8 months. Note that Klaus may not have shared all experience and actually has more experience.

Based on recent experience, Klaus would be well-suited for roles such as: Interim Manager: Head of Data Centers, Interim Manager: Head of IT, Project Manager / Interim Manager.

Klaus's most recent position is Interim Manager: Head of Data Centers at Stromnetz Berlin.

In recent years, Klaus has worked for Stromnetz Berlin, Investment sector, and IT service provider in the banking sector.

Klaus is most experienced in industries like Information Technology, Aerospace and Defense, and Energy. Klaus also has some experience in Automotive, Telecommunication, and Retail.

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

Klaus has recently worked in industries like Information Technology, Banking and Finance, and Utilities.

Klaus has recently worked in business areas like Information Technology, Project Management, and Operations.

Klaus holds a Bachelor in Electrical Engineering from University of Kassel.

Klaus has 4 certificates. Among them, these include: Driver's license classes A, Driver's license classes BE, and Driver's license classes CE.

The availability of Klaus needs to be confirmed.

Daily rate distribution

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Daily rate avg. 823 €

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Median rate 820 €

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Calculated based on our freelancers’ daily rates as of 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.