Stefan Zimmer - SAP Basis Consultant / SAP Technical Consultant

Q: Where is Stefan based?

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

Q: What languages does Stefan speak?

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

Q: How many years of experience does Stefan have?

Stefan has at least 23 years of experience. During this time, Stefan has worked in at least 2 different roles and for 14 different companies . The average length of individual experience is 2 years and 8 months . Note that Stefan may not have shared all experience and actually has more experience.

Q: What is Stefan's latest experience?

Stefan's most recent position is SAP Basis Consultant / SAP Technical Consultant at VHV Gruppe / VHV solutions GmbH .

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

In recent years, Stefan has worked for VHV Gruppe / VHV solutions GmbH .

Q: Which industries is Stefan most experienced in?

Stefan is most experienced in industries like Insurance , Information Technology (IT) , and Energy . Stefan also has some experience in Automotive , Banking and Finance , and Construction .

Q: Which business areas is Stefan most experienced in?

Stefan is most experienced in business areas like Information Technology (IT) , Project Management , and Operations .

Q: Which industries has Stefan worked in recently?

Stefan has recently worked in industries like Insurance .

Q: Which business areas has Stefan worked in recently?

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

Recommended expert

Hanover, Germany

Experience

Mar 2017 - Present

9 years

SAP Basis Consultant / SAP Technical Consultant

VHV Gruppe / VHV solutions GmbH

Technical consulting on cross-cutting SAP topics
Incident, problem, change, and release management via ChaRM
Implementation of support package stacks for AS ABAP and AS Java
Unicode conversions for BW and ERP systems (CU&UC – in-place and 2-server option)
Upgrade from EHP7 with NetWeaver 7.4 to EHP8 with NetWeaver 7.5 for ERP systems
Database upgrades for DB2 LUW from 10.5 to 11.1 and fix pack installations
Installation and configuration of SAP Web Dispatcher
Homogeneous system copies (LaMa/PCA)
Setting up and harmonizing test and project environments
Collaboration in the HANA transformation project (S/4HANA, H4S4, BW/4HANA)
Configuration of the web service runtime and SOAP
Administration and optimization of interfaces (RFC, XML, web services)
SAP NetWeaver security and system hardening
SSL configuration and certificate implementation
Creation and execution of audits (SAP, database, operating system)
Agile methodology (Kanban), project coaching, and technical subproject management
Transport management and Solution Manager customizing
Monitoring and archiving of logs
Technical transformation from on-premise to AWS Cloud HANA
Implementation of DORA regulations (SNC encryption)

Jan 2016 - Sep 2016

9 months

SAP Basis Consultant / SAP Technical Consultant

Deutsche Messe AG / FUBA Automotive Electronics GmbH

Integration of SAP components with other software components
Technical implementation of SAP Fiori
Development of an SAP Basis authorization concept
User administration and authorizations
Creation of operation manuals and system documentation
Configuration of SAP systems for TLS 1.2
Installation and configuration of SAP Web Dispatcher 7.45 (SSL/TLS)
Homogeneous system copies for ERP systems with Oracle ASM
Second- and third-level support
Development and implementation of customer requirements

Jan 2015 - Sep 2015

9 months

SAP Basis Consultant / SAP Technical Consultant

Stromnetz Hamburg GmbH

Migration and operation of SAP IS-U, ERP, HCM, and BW system landscapes
Carve-out/carve-in project from Vattenfall to SNH
Heterogeneous migration (AIX → Oracle, Windows Server 2012 → SQL Server)
Planning and execution of upgrades, installations, and system copies
Vulnerability analysis, performance monitoring, and tuning
Technical customizing of HCM systems and business connectors (ELSTER, LstA, LSTB, ELStAM)
Connection of HCM systems to social security providers (PKCS#7)
Setting up and administration of SAP portal system landscapes
Deployment of Java components
Configuration of ALE, BEx Web, information broadcasting, SSL for AS ABAP/Java
Implementation of support package stacks
Adobe Document Services via portal connection
Solution Manager configuration and system integrations

Jan 2013 - Nov 2014

1 year 11 months

SAP Basis Consultant / SAP Technical Consultant

Volkswagen AG

Administration and operation of the corporate-wide SAP infrastructure (Europe, Asia, Russia, Americas)
Incident, problem, change, and release management via HP Service Center (ITSM)
Ensuring ongoing SAP operations and dedicated interfaces
Patching and deployment of Java components
System copies, moves, and migrations (ABAP & Java)
Support packages and patches for AS ABAP and AS Java
Performance analyses, optimization, and load testing
Database upgrades (Oracle 10g → 11g)
Installation and upgrade of SAST (auditing tool)

Jan 2006 - Dec 2013

8 years

SAP Basis Consultant / SAP Technical Consultant

E.ON IT GmbH / HP Deutschland GmbH

Technical consulting for SAP system operations in migration projects and international rollouts
ITIL-based incident, problem, change, and release management
Installation of single stack ABAP and dual stack NetWeaver
Operation of SAP Business Objects and migration of complex SAP systems (AIX → Linux, Oracle)
Cross-data-center migrations
Patching of Java components and the J2EE engine
Deployment/undeployment of Java components
Homogeneous system copies
Performance analyses and tuning
Upgrade from R/3 4.6C to ECC 6.0 and Unicode conversions
Middleware configuration (qRFC/tRFC) for IS-U and CRM
Database upgrade Oracle 9i → 10g
Configuration and administration of IPC and SAProuter
Pre-calculation server for BI; Compliance Calibrator 5.2
Project coordination and coaching (ITO, HVP, GLOBE)
Data center maintenance in the SAP environment
SAP Web Dispatcher, PI/XI, Solution Manager, and Maintenance Optimizer
EhP upgrades via EhP Installer and SUM (NW 7.01/7.02/7.31)

Jan 2006 - Mar 2006

3 months

SAP Basis Consultant

Gutenberg Rechenzentrum GmbH

Homogeneous system copies
Release upgrade SAP R/3 4.6C → mySAP ERP 2004 (ECC 5.00)
Creating documentation and procedural instructions

Jan 2005 - Nov 2005

11 months

SAP Basis Consultant

Finanz.IT GmbH

Technical consulting for setup, implementation and operation of SAP system landscapes in the IFRS environment
Creating operational concepts and operation manuals
Setting up system operation and production architecture
Installations, client copies, database administration and system copies
Coordinating and implementing support packages and patches
Migration of productive BW clients
Coaching for load, performance and system tests

Jan 2004 - Oct 2004

10 months

SAP Basis Consultant

Solvay Pharmaceuticals GmbH

Planning, coordinating and executing all SAP Basis activities
User administration and central user administration (CUA)
Monitoring background processing (BatchMan)
Supporting international projects up to go-live
Monitoring interfaces and technical troubleshooting
Coordinating and implementing support packages and patches
Language transports and language imports
Technical application support

Jan 2004 - May 2004

5 months

SAP Basis Consultant

BASF AG

Technical consulting for implementing SOX-compliant concepts
Creating and implementing authorization concepts
User administration and cleanup of critical authorizations
Activating and configuring the Security Audit Log
Archiving postings, system log and audit log
Emergency user and development guidelines
Analyzing relevant transactions and role design
Security concept for OS level and application access

Jan 2003 - Feb 2003

2 months

SAP Basis Consultant

Clariant GmbH

Identifying and resolving basis-related issues
Conducting performance analyses
Coaching for implementing support packages and patches

Jan 2002 - Feb 2003

1 year 2 months

SAP Basis Consultant

Postbank Systems AG

Administrative SAP operations management
User management and central user management (ZBV)
Interface monitoring and support
Implementation of support packages and patches
Performance monitoring and bottleneck resolution
Configuration of SAProuter and communication interfaces
Implementation of operating concepts

Jan 2002 - Jun 2002

6 months

SAP Basis Consultant

Bertelsmann Media Systems AG

System copies and database administration
Support packages and patches
Identification and resolution of Basis-related issues
System performance monitoring and optimization

Jan 2001 - Jun 2001

6 months

SAP Basis Consultant

Popnet Systems GmbH

Installations, system copies and backup/recovery
Database administration and optimization
Communication interface configuration and monitoring
Support packages and patches
Security and performance concepts

Jan 1999 - Mar 2000

1 year 3 months

SAP Basis Consultant

Bauer Gruppe

BatchMan configuration and job management
Background processing and SAProuter monitoring
Installations and database upgrades
Client copies and language transports
Support packages, add-ons, patches and corrections

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 Insurance (9 years), Information Technology (8.5 years), Energy (8 years), Automotive (2.5 years), Banking and Finance (2 years), and Pharmaceutical (1 year).

Insurance

Information Technology

Energy

Automotive

Banking and Finance

Pharmaceutical

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 (23.5 years), Project Management (17 years), and Operations (3 years).

Information Technology

Project Management

Operations

Summary

As an SAP technology consultant, I provide professional support for both smooth and secure SAP operations and for executing demanding SAP projects.

With my expert technical knowledge and an agile, strategy- and process-driven mindset, I advise clients on implementation and upgrade projects as well as on the technical optimization of deployed SAP software.

In projects, I work as a coach to project management on technical topics; I also serve as a technical subproject lead.

I guide clients in designing, building, operating, and technically maintaining all SAP NetWeaver components and integrating them with other software components, considering customer- and project-specific requirements.

Skills

Technology Consulting For All Sap Netweaver Components On Aix, Linux, Solaris, Hp-ux, Windows Server 2012 R2, With Ms Sql Server, Ibm Db2 Luw (Db6), Oracle, And Hana.
Planning, Installation, Administration, And Optimization Of Sap System Landscapes And Existing Interfaces
Technical Planning And Execution Of Implementation, Carve-out/-in, Upgrade, And Migration Projects
Sap Unicode Conversions (Cu&uc – In-place And 2-server Option)
Analysis And Resolution Of Technical Issues In The Sap Environment
Consulting And Operational Design For Sap System Architectures And Interfaces
Professional Support In It Projects And Day-to-day Operations
Incident, Release, Deployment, And Change Management
Operational Concepts And Documentation
Performance Analysis And Tuning
Sap Netweaver Security And System Hardening
Creation And Execution Of Audits For Sap Systems
Project Coaching And Technical Subproject Management
Working With Agile Methods And Principles (E.g., Kanban)
Technical Consulting On Cross-cutting Sap Topics
Sap On Aws (Sap In The Cloud, Hana)
Agile Mindset With Strong Empathy, Communication Skills, And A Solution-oriented Approach

Languages

German

Native

English

Advanced

Profile

Created

July 2024

Last Update

February 2026

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Frequently asked questions

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

Where is Stefan based?

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

What languages does Stefan speak?

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

How many years of experience does Stefan have?

Stefan has at least 23 years of experience. During this time, Stefan has worked in at least 2 different roles and for 14 different companies. The average length of individual experience is 2 years and 8 months. Note that Stefan may not have shared all experience and actually has more experience.

What roles would Stefan be best suited for?

Based on recent experience, Stefan would be well-suited for roles such as: SAP Basis Consultant / SAP Technical Consultant, SAP Basis Consultant.

What is Stefan's latest experience?

Stefan's most recent position is SAP Basis Consultant / SAP Technical Consultant at VHV Gruppe / VHV solutions GmbH.

What companies has Stefan worked for in recent years?

In recent years, Stefan has worked for VHV Gruppe / VHV solutions GmbH.

Which industries is Stefan most experienced in?

Stefan is most experienced in industries like Insurance, Information Technology (IT), and Energy. Stefan also has some experience in Automotive, Banking and Finance, and Construction.

Which business areas is Stefan most experienced in?

Stefan is most experienced in business areas like Information Technology (IT), Project Management, and Operations.

Which industries has Stefan worked in recently?

Stefan has recently worked in industries like Insurance.

Which business areas has Stefan worked in recently?

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

What is the availability of Stefan?

Stefan is immediately available full-time for suitable projects.

What is the rate of Stefan?

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