Stefan Zimmer - Technical SAP Consulting for the Digitalization Initiative of the VHV Group

Go to Website

Hanover, Germany

Experience

Mar 2017 - Present

8 years 5 months

Hanover, Germany

Technical SAP Consulting for the Digitalization Initiative of the VHV Group

VHV Group / VHV solutions GmbH

Technical consulting on overarching 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).
Release upgrade from EHP7 with NetWeaver 7.4 to EHP8 with NetWeaver 7.5 for ERP systems.
Database upgrades DB2 LUW from 10.5 to 11.1 and installation of fix packs.
Installation and configuration of SAP Web Dispatcher.
Homogeneous system copies (SAP Landscape Management - LaMa / Post-Copy Automation – PCA).
Setup of consistent test and project environments within an SAP landscape and their harmonization for two major customer projects.
Participation in the HANA transformation project to migrate the SAP landscape to the target HANA architecture (replacing ERP Suite and SAP BW with S/4HANA, H4S4 and BW/4HANA).
Configuration of the Web Service Runtime and SOAP.
Administration and optimization of interfaces (RFC, XML, Web Services).
SAP NetWeaver security / system hardening / secure configuration of SAP systems.
SSL configuration for system encryption and certificate implementation.
Creation and execution of audits (SAP, database, and OS).
Work in operations and projects with agile methods and principles (Kanban).
Transport management and configuration of the Transport Management System.
Customizing of Solution Manager functionalities.
Monitoring of SAP landscapes.
Coordination and implementation of log archiving (changes to customizing tables, IDocs, change documents, and application logs) across system tracks to reduce system sizes.
Technical transformation/migration of SAP systems on-premise to AWS cloud on HANA (SAP on AWS Cloud).
Implementation of requirements from the EU DORA regulations: system hardening for encryption of SAP GUI and RFC communication via SNC.
Operating systems: MS Windows Server R2, Linux SLES-15
Databases: DB2 LUW 10.5 and 11.1, HANA 2.0
Products: EHP7 and EHP8 for SAP ERP 6.0, SAP NetWeaver 7.5, SAP BW 7.5, Solution Manager 7.2, SAP CRM, SAP SEM 607, AS Java 7.50, SAP Landscape Management (LaMa 3.00), SAP BW/4HANA, SAP S/4HANA

May 2016 - Jan 2017

9 months

Hanover, Germany

Integration of SAP Components with Other Software Components Considering Customer and Project Requirements

Deutsche Messe AG / FUBA Automotive Electronics GmbH

Technical implementation of SAP Fiori
Development of an SAP Basis authorization concept
User administration and authorizations
Creation of operations manuals and system documentation
Configuration of SAP systems to establish TLSv1.2 protocol
Installation and configuration of SAP Web Dispatcher 7.45 to use SAP and non-SAP systems via SSL/TLS
Homogeneous system copies for ERP systems with Oracle ASM
Second- and third-level support
Development and implementation of customer requirements
Operating systems: Linux (SLES-11), MS Windows Server R2
Databases: Oracle 11 (ASM), Oracle 12, SAP in-memory (SAP HANA) 2.0
Products: EHP7 for SAP ERP 6.0, SAP NetWeaver 7.4, EHP1 for SAP CRM 7.0, SAP BW 7.01, SAP Business Connector 4.8, Solution Manager 7.1

May 2015 - Jan 2016

9 months

Hamburg, Germany

Migration and Operation of SAP IS-U, ERP, HCM, and BW Landscapes Carve-Out/Carve-In Project from Vattenfall to SNH

Stromnetz Hamburg GmbH

Transition (heterogeneous migration) of a complete SAP infrastructure (IS-U, ERP, HCM, BI) from Vattenfall to Stromnetz Hamburg data center from AIX on Oracle to Windows Server 2012 on SQL Server
Planning and execution of SAP release upgrades, installations, and homogeneous/heterogeneous system copies
Vulnerability analysis and troubleshooting in SAP architecture, performance monitoring, analysis, and optimization
Configuration and technical customizing of SAP HCM systems and SAP Business Connectors for ELSTER, LstA (wage tax registration), LSTB (wage tax certificates), and ELStAM functionality (government communication, B2A)
Technical connection of SAP HCM systems for data exchange with social insurance agencies (ITSG communication server, PKCS#7)
Setup and administration of SAP portal landscapes (installations, system copies, portal connections, BI portal integration)
Deployment of Java components and applications
Configuration of ALE, BEx Web, Information Broadcasting, SSL for AS ABAP and AS Java
Implementation of support package stacks
Implementation of Adobe Document Services on IS-U systems via portal integration
Solution Manager: configuration, system preparation, and connections
Operating systems: MS Windows Server 2012 R2, Linux (Red Hat)
Databases: MS SQL Server 2012, Oracle 11
Products: SAP NetWeaver 7.4, SAP Solution Manager 7.1, EHP7 for SAP ERP 6.0, SAP SEM 6.0, AS Java 7.40, SAP Business Connector 4.8

Mar 2013 - Jan 2015

1 year 11 months

Wolfsburg, Germany

Administration and System Operation of the Global SAP Infrastructure for Sites in Europe, Asia, Russia, and America

Volkswagen AG

Incident, problem, change, and release management via HP Service Center (ITSM)
Ensuring continuous operation of SAP systems and dedicated interfaces
Patching and deployment of Java components
System copies, system migrations (ABAP & Java)
Support packages and patches for AS ABAP and AS Java
Performance analysis and optimization, including load tests
Database upgrades (Oracle 10g to 11g)
Installation and upgrade of SAST (auditing tool)
Operating system: UNIX (HP-UX)
Databases: Oracle 9i, 10g, 11g, SAP HANA Platform Edition 1.0
Products: SAP 4.6C through ECC 6.0, EHP7 for SAP ERP 6.0, NetWeaver 7.4, Solution Manager, SAP PI, EHP3 for SRM, SAP BW 7.4, AS Java 7.31

Oct 2006 - Dec 2006

3 months

Hanover, Germany

Technical Consulting for SAP System Operations

Gutenberg Rechenzentrum GmbH

Homogeneous system copies
Release upgrade from SAP R/3 4.6C to mySAP ERP 2004 (ECC 5.00)
Creation of documentation and work instructions
Operating systems: UNIX (HP-UX)
Database: Oracle 9i
Products: SAP R/3 4.6C, SAP R/3 Enterprise 4.70, SAP ERP 2004

Jan 2006 - Dec 2013

8 years

Hanover, Germany

Technical Consulting for SAP System Operations in Various Migration Projects and International Rollouts

E.ON IT GmbH / HP Deutschland GmbH

ITIL (incident, problem, change, and release management via HP Service Center)
Installation of SAP NetWeaver systems according to desired architecture (single-stack ABAP, dual-stack ABAP & Java)
Installation and operation of SAP Business Objects systems
Migration of complex SAP systems from AIX to Linux and Oracle
Data center–wide migration of complex SAP landscapes
Patching of Java components and J2EE engine
Deployment/undeployment of Java components
Homogeneous system copies
Performance analysis and optimization
Release upgrade from SAP R/3 4.6C to SAP ERP (ECC 6.00) and Unicode conversion
Configuration and optimization of SAP middleware (qRFC/tRFC) for IS-U and CRM systems
Database upgrade ORACLE 9i to ORACLE 10g
Configuration/administration of the IPC
Implementation of precalculation servers for SAP BI (Precalculation Service)
Implementation of Compliance Calibrator 5.2
Administration, configuration, and migration of SAProuters
Provisioning of current language transports and language loads
Project coordination and coaching for large projects ITO, HVP, and GLOBE
Coordination of data center maintenance in the SAP environment
Installation and configuration of SAP Web Dispatcher
Support and installation of SAP PI/XI systems
Solution Manager, Maintenance Optimizer, landscape maintenance
EhP5 upgrade via EhP installer for SAP ERP 6.0/NW 7.02
EhP4 upgrade via SUM for SAP ERP 6.0/NW 7.01
EhP6 upgrade via SUM for SAP ERP 6.0/NW 7.31
Operating systems: UNIX (Sun Solaris Cluster, AIX, Linux), Windows
Databases: Oracle 9i, 10g, 11g
Products: SAP ERP 6.0, SAP IS-U, SAP CRM, SAP BI 7.0, SAP BW 7.02/7.3, SAP PI, SAP SEM, NetWeaver 7.31

Mar 2005 - Jan 2006

11 months

Hanover, Germany

Technical Consulting for the Setup, Implementation, and Operation of SAP Landscapes in the IFRS Environment (Bank Analyzer and

Finanz.IT GmbH

Creation of operations concepts and run books for SAP infrastructure and interface systems
Setup of system operations and production architecture for SAP landscapes
Installations, client copies, database administration, and system copies
Coordination and implementation of support packages and patches
Migration of productive BW clients
Coaching in SAP Basis for load, performance, and system tests
Operating system: UNIX (AIX)
Database: Oracle 9i
Products: NetWeaver 04, SAP Web AS 6.30, SAP Bank Analyzer 4.0, SAP BW 3.5

Sep 2004 - Jan 2005

5 months

Ludwigshafen, Germany

Technical Consulting for Implementing Audit-Proof Concepts to Meet Sarbanes-Oxley Act Requirements

BASF AG

Creation and implementation of authorization concepts
User administration and authorizations
Cleanup of critical authorizations in existing roles
Identification and selection of security-relevant profile parameters
Activation and configuration of the Security Audit Log
Archiving of postings, system log, and Security Audit Log
Concept for emergency users and development guidelines
Identification of critical authorization combinations
Analysis of relevant transactions for SAP Basis and role design by function
Definition and design of processes (for various support departments)
Security concept for controlled application access at the OS level
Operating system: UNIX (AIX)
Database: Oracle 9i
Products: SAP R/3 Enterprise 4.70, SAP SCM 4.0

Mar 2004 - Dec 2004

10 months

Hanover, Germany

Planning, Coordination, and Execution of All Activities in the SAP Basis Area

Solvay Pharmaceuticals GmbH

User administration and authorizations
Configuration and monitoring of a central user management (ZBV)
Monitoring and configuration of background processing
Job management via BatchMan
Support of international projects up to go-live on various SAP Basis topics
Monitoring and support of interfaces
Identification and resolution of Basis-related issues
Coordination and implementation of support packages and patches
Provision of current language transports and language loads
Support for smooth and secure operation of Basis technology and application logic (technical application support)
Operating system: UNIX (AIX)
Databases: Oracle 8/9
Products: SAP APO/SCM, SAP BW 3.1, SAP R/3 4.6C, SAP WAS 6.30

Nov 2003 - Dec 2003

2 months

Frankfurt, Germany

Planning, Coordination, and Execution of All Activities in the SAP Basis Area

Clariant GmbH

Identification and resolution of Basis-related issues
Performance analyses
Coaching for support package and patch implementation
Operating system: UNIX (HP-UX)
Database: Oracle 9i
Products: SAP WAS 6.20, SAP BW 3.1

Jul 2002 - Dec 2002

6 months

Gütersloh, Germany

Execution of All Activities in the SAP Basis Area Regarding

Bertelsmann Media Systems AG

System copies
Database administration and optimization
Support packages and patches
Identification and resolution of Basis-related issues
Monitoring system performance (resolving resource bottlenecks and throughput issues)
Operating systems: UNIX (AIX, HP-UX, Sun OS)
Database: Oracle 8
Products: SAP R/3 4.0B/4.6C, SAP WAS 6.20, SAP BW 3.0A, SAP APO

Jan 2002 - Feb 2003

1 year 2 months

Bonn, Germany

Execution of All Administrative Tasks for SAP Operations

Postbank Systems AG

User administration and authorizations
Monitoring interfaces and their support
Implementation of support packages and patches
Support for smooth and secure SAP Basis operations
Configuration and monitoring of communication interfaces like SAProuter
Configuration and monitoring of central user management (ZBV)
Monitoring system performance and resolving bottlenecks
Implementation of operations concepts
Operating systems: UNIX (AIX, Linux), z/OS, OS390
Databases: Oracle 8/9, DB2
Products: SAP R/3 4.0B/4.6C, SAP WAS 6.20, SAP BW 3.0B/3.1, SAP Solution Manager, Patrol for R/3 Suite

Jul 2001 - Dec 2001

6 months

Hamburg, Germany

Planning, Coordination, and Execution of All Activities in the SAP Basis Area

PopNet Systems GmbH

Installations
System copies
Backup and recovery
Database administration and optimization
Configuration and monitoring of communication interfaces
Coordination and implementation of support packages and patches
Implementation of security and performance concepts and performance analyses
Operating system: Windows NT
Database: Oracle 8
Products: SAP R/3 4.5B/4.6C

Jan 1999 - Mar 2000

1 year 3 months

Hamburg, Germany

Execution of All SAP Basis Activities

Bauer Group

Installation and configuration of BatchMan
Job management via BatchMan
Monitoring and configuration of background processing
SAP installations and database upgrades
Client copies
Support packages, add-ons, patches, and SAP corrections
Configuration and monitoring of SAProuter
Operating systems: UNIX (Linux), Windows NT
Database: Oracle 8
Product: SAP R/3 3.1I/4.0B

Summary

As an SAP technology consultant, I provide professional support for smooth and secure SAP operations as well as for complex SAP project implementations.

With my technical expertise and an agile, strategy- and process-driven mindset, I advise clients on implementation and upgrade projects and on technically optimizing their SAP software.

In projects, I work both as a coach to project management on technology topics and as a technical subproject lead.

I advise clients on the design, setup, operation, and technical maintenance of all SAP NetWeaver components and their integration with other software components, taking into account customer- and project-specific requirements.

Languages

German

Native

English

Advanced

Need a freelancer? Find your match in seconds.

Try FRATCH GPT