Klaus Weltermann - Interim Manager: Head of Data Centers

Q: Where is Klaus based?

Klaus is based in Kassel, Germany .

Q: What languages does Klaus speak?

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

Q: How many years of experience does Klaus have?

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.

Q: What is Klaus's latest experience?

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

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

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

Q: Which industries is Klaus most experienced in?

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

Q: Which business areas is Klaus most experienced in?

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

Q: Which industries has Klaus worked in recently?

Klaus has recently worked in industries like Information Technology (IT) , Banking and Finance , and Utility Services .

Q: Which business areas has Klaus worked in recently?

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

Recommended expert

Kassel, Germany

Experience

Sep 2024 - May 2025

9 months

Berlin, Germany

Interim Manager: Head of Data Centers

Stromnetz Berlin

Managing the data centers and the team
Ensuring and improving operations
Training a successor and handing over responsibilities

Jul 2023 - May 2024

11 months

Interim Manager: Head of IT

Leading the IT department as interim manager
Finding a successor and onboarding them into the role

May 2022 - Dec 2022

8 months

Project Manager / Interim Manager

Investment industry

Taking over provider management for over half a year
Planning, executing, and successfully completing projects in the UC area

Oct 2021 - Apr 2022

7 months

Project Manager

IT service provider in the banking sector

Implementing a SAM system for a large bank
Leading a feasibility study for another institution

Jun 2021 - Sep 2021

4 months

Project Manager

Planning and implementing a new communication system to replace phone and video conferencing technology as part of a company restructuring
Deploying it at headquarters and satellite offices

Nov 2019 - Oct 2020

1 year

Project Manager

Real Estate Industry

Introduction of a new UC communication platform for a large mid-sized company
Transition of the production platform into operational mode after a testing phase
Project management and support for the realignment of the IT department

Feb 2019 - Jul 2019

6 months

Project Manager

ISS

Deployment of a large, fully geo-redundant Skype for Business platform for a major service company
Implementation of several call centers including IVR functionalities
Conversion of a data center into a geo-redundant data center cluster
Relocation of the data center to a new site, demolition of the old data center, planning of the new build and platform design through to completion

Oct 2018 - Jan 2019

4 months

Consultant

Automotive Supplier Industry

Support in the search for an IT manager
Consulting on daily IT operations
Onboarding the new IT manager

Nov 2017 - Jun 2018

8 months

Request Manager

BASF

Coordination, management and planning of the global expansion and restructuring of the data network (WAN / LAN / WLAN) as part of day-to-day business

Mar 2017 - Sep 2017

7 months

Project Manager

TENNET

Planning and coordination of IT-related topics for the relocation of a corporate headquarters of a major energy service provider
Planning and oversight of the IT infrastructure setup, including the WLAN network
Move planning including 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

Conducted a feasibility study for the CEO focusing on IT security
Took into account feasibility, cost-benefit ratio, and meeting all security requirements

May 2016 - Sep 2016

5 months

Germany

Transition Manager

Deutsche Bank

Transferred a business unit to an Indian outsourcing provider
Acted as transition manager and project lead

Nov 2015 - May 2016

7 months

Germany

Assessor

TÜV Rheinland

Served as an assessor for data centers and networks

Jan 2015 - Oct 2015

10 months

Germany

Interim Manager / Project Lead

AS Schulman

Managed IT operations and the local helpdesk
Planned and carried out the office move of the German headquarters and the data center relocation
Redesigned the campus network and planned and implemented the Wi-Fi network
Carried out email and software migration to MS Office 365 and Skype for Business
Responsible for IT service in Germany with team management
Software migration and rollout to Office 365

Jun 2014 - Nov 2014

6 months

Germany

Consultant / Project Lead

BAYER AG

Provided process consulting and introduced operational processes for user provisioning and management
Developed and implemented a new operating concept with processes for a specific group of IT users

Aug 2013 - Dec 2016

3 years 5 months

Germany

Consultant / Assessor

TÜV Rheinland

Various tasks as a consultant and assessor
Advising an automotive company on building a secure IT infrastructure
Auditing an outsourcing data center for an outsourcing provider
Consulting and support for a large energy service provider on setting up an operations organization
Support in preparing EU-compliant tenders

Jun 2013 - Aug 2013

3 months

Consultant

COMPUTACENTER

Advising an IT service provider on building a service center as part of an outsourcing contract
Developing concepts for organizational structure and reporting for the customer support area of a major telecommunications division
Aligning Service Level Agreements (SLAs) with the client

Jan 2013 - May 2013

5 months

Germany

Project Manager

Deutsche Post Group

Leading a virtualization project to fully virtualize a data center based on VMware
Preparing the data center relocation, including hardware procurement and phased migration of systems to the new platform

Jul 2011 - Jun 2012

1 year

Project Manager

BP Europe SE / ATOS

Upgrading a data center's power supply to modern technical standards as part of a multi-phase concept
Sequential upgrade of the power supplies in a mission-critical data center during live operation without any downtime
Leading the project team and negotiating with internal and external service providers
Creating, aligning, and executing the project plan
Responsible for the change process while adhering to the SLAs

Jan 2011 - Apr 2011

4 months

Project Manager

Vodafone Global

Developing and implementing an action plan to improve the service of a large international IT platform (web, email)
Managing subcontractors, and ensuring and tracking SLAs / OLAs

Jun 2010 - Dec 2010

7 months

Interim Management: Business2IT Alignment

European Airline

Responsible 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 of a large investment bank with about 40 employees
Recruitment, knowledge development, and process implementation
Managed the interface with the client
Built the IT infrastructure and gradually transferred services to the in-house data center while in operation
Responsible for budget, personnel, and SLAs

Jan 2009 - Apr 2009

4 months

Project Manager

TELEFONICA

Took over operations of 3rd-level support at a large telecommunications company (DSL provider)
Negotiated OLAs and organized the support
Designed processes and organized staff training

Nov 2008 - Jan 2009

3 months

Consultant

DB SCHENKER

Advised on restructuring a service organization at a logistics company
Assessed the current state and supported all questions related to the restructuring

Mar 2008 - Sep 2008

7 months

Germany

Release Manager / Consultant

Deutsche Bahn

Release management for a financial billing system of a large transport and logistics group
Implemented a new financial billing system in 3-tier architecture
Created release plans, managed escalations, and monitored the project implementation
Ensured compliance with SLAs

May 2007 - Oct 2007

6 months

Project Manager / Consultant

BWI-IT

Created technical concepts and managed the rollout of a large public-private partnership project
Represented the CIO organization's interests during the IT infrastructure rollout
Built the infrastructure from scratch and rolled out IT network technology and telecom network
Connected the infrastructure to outsourcing service providers

Feb 2007 - Mar 2007

2 months

Consultant

VODAFONE

Conducted an interface audit for an outsourcing project of a major German mobile operator
Audited and reviewed interfaces to the outsourcing provider and negotiated new interfaces and access points
Negotiated SLAs

Jun 2006 - Jan 2007

8 months

Germany

Interim Manager: Head of the Internet Data Center

T-Mobile

Managed the data center and ensured operations with around 40 staff
Implemented processes and the REMEDY tool
Negotiated with vendors and upgraded to a new subscriber database

Oct 2005 - Mar 2006

6 months

Germany

Interim Manager: Head of Competence Center

State of Hesse

Developed an operating concept for a newly established IT Competence Center for the Hessian police and served as interim manager
Coordinated IT for the 2006 FIFA World Cup

Mar 2005 - Sep 2005

7 months

Project Manager

Provider in the defense / national security sector

Managed the project and led subcontractors 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 the strategy implementation and transition management for a large German mobile operator
Leading the project team (approx. 30 people), handling escalations and negotiating with vendors
Milestone planning, resource coordination and reporting
Relocating the server infrastructure and accepting and handing over the systems to operations

Jan 2004 - Apr 2004

4 months

Germany

Project Manager: Software Upgrade of Exchange Centers

o2

Software upgrade of all exchange centers in Germany for a major German telecom provider
Leading the project team and negotiating with vendors
Planning project milestones, resource coordination and documentation
Acceptance testing of the solution and handover to operations

Jan 2003 - Dec 2003

1 year

Germany

Project Manager: Type Approval Project

VODAFONE

Acceptance testing of new transport network components before their rollout to operations
Leading the project team (approx. 20 people) and defining the project plan and resources
Defining test requirements and coordinating with the manufacturer
Reporting, documentation and handing over the results to the customer

Jan 2003 - Mar 2003

3 months

Consultant

Insurance Company

Consulting on restructuring the IT service department of an insurance company

Jan 2000 - Dec 2002

3 years

Head of Operations (Division Manager)

EINSTEINet AG

Building the Hamburg data center and managing the EINSTEINet data center operations
Managing the phone and data network operations, the web farm, the Windows 2000/Citrix cluster and the customer care organization from scratch
Building the team and being responsible for approx. 130 employees, including setting up shift operations
Modeling business processes and building the call center department using the Remedy tool
Negotiating contracts with customers and suppliers and contributing to framework agreements for ASP/outsourcing
Reporting to investors and the supervisory board
Managing licenses with software vendors under the ASP licensing model
Responsible for operations as an outsourcing service provider

Jan 1998 - Dec 2000

3 years

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

OBI Baumärkte / Gesellschaft für Datenverarbeitung mbH

Managed the IT of the OBI group (about 70 employees) and led outsourcing partners
Introduced an AS/400 environment and migrated SAP R/3 systems from AIX to NT with Oracle DB
Set up an SAP R/3 system for Eastern Europe / Asia as part of an insourcing project
Modeled business processes for support and operations and introduced internal SLAs
Successfully managed the Y2K transition of the corporate infrastructure and the data center relocation
Managed a budget of about 30 million DM
Set up a data warehouse system on NCR-Teradata
Responsible for the international transport network of the OBI group
Responsible for 1st/2nd/3rd level support in a client/server environment
Rolled out new IT workstations for employees as part of the Y2K project
Developed a concept for insourcing a merchandise management system

Jan 1996 - Dec 1999

4 years

Germany

Head of International Field Service & Technical Manager Frankfurt

Lufthansa AG / Lufthansa Systems GmbH

Provided technical and disciplinary leadership for up to 50 employees
Led Lufthansa's international IT service as a department head with a budget responsibility of 12 million DM
Global rollout project for Lufthansa Cargo and rollout of client/server infrastructure for Lufthansa Italy
Established the Frankfurt branch and managed it as a profit center
Negotiated the outsourcing contract and set up operations for a large server farm for Commerzbank AG
Created a turnaround plan for a client's operations in the savings bank sector

Various assessments / short-term activities

Various consulting assignments and preparation of expert reports

Germany

Employment

IBM Deutschland GmbH

Supported clients in the mid-sized business sector with AS/400 and AIX systems through several fixed-term contracts

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (10.5 years), Aerospace and Defense (5 years), Energy (4.5 years), Telecommunication (3.5 years), Automotive (3.5 years), and Retail (3 years).

Information Technology

Aerospace and Defense

Energy

Telecommunication

Automotive

Retail

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (21.5 years), Operations (14.5 years), Project Management (14 years), Procurement (5 years), Audit (3.5 years), and Legal (3.5 years).

Information Technology

Operations

Project Management

Procurement

Audit

Legal

Skills

Data Center Infrastructure, It Security, Migrations, Refurbishment, Cloud Infrastructure
Wan, Lan – Networks Of All Available Infrastructures
Ipv6 - Migration
It Basic Protection According To Bsi (Din 27001)
Setup / Relocation / Renovation / Consolidation Of Data Center Infrastructure
Business Process Modeling / Itil V3
Contract Negotiations With Vendors / Customers
Managing Service Providers / Vendors
Building / Restructuring It Organizations
From Customer Care / Helpdesk
Service Management Through Data Center Operations To On-site Service According To Itil
Creating Service Level Agreements (Slas)
Implementation Of Processes
License Management / Licensing Models
Creating Requirements Catalogs And Sow Documents
Staff Development / Leadership In It
Rollout Projects
Outsourcing / Insourcing It Operations
Relocation Of Data Centers / Server Infrastructure
Project Management According To Gpm - Ipma / Prince2
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

Diploma in Electrical Engineering, specialization in communications engineering · Electrical Engineering · Kassel, Germany

Certifications & licenses

Driving license class A

Driving license class BE

Driving license class CE

Class B approval

Federal Office for Telecommunications Approvals

Profile

Created

August 2025

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Frequently asked questions

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

Where is Klaus based?

Klaus is based in Kassel, Germany.

What languages does Klaus speak?

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

How many years of experience does Klaus have?

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.

What roles would Klaus be best suited for?

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.

What is Klaus's latest experience?

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

What companies has Klaus worked for in recent years?

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

Which industries is Klaus most experienced in?

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

Which business areas is Klaus most experienced in?

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

Which industries has Klaus worked in recently?

Klaus has recently worked in industries like Information Technology (IT), Banking and Finance, and Utility Services.

Which business areas has Klaus worked in recently?

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

What is Klaus's education?

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

Does Klaus have any certificates?

Klaus has 4 certificates. Among them, these include: Driving license class A, Driving license class BE, and Driving license class CE.

What is the availability of Klaus?

Klaus is immediately available for suitable projects.

What is the rate of Klaus?

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