Matthias (Dr.) O.
Freelance work
Experience
Jun 2024 - Mar 2025
10 monthsFrankfurt am Main, Germany
Freelance work
Etengo
- Consulting in the SAP EAM module
- Reviewing and estimating costs for customer-specific developments during the migration to the S/4 HANA oneERP system at EON
- Migrating EAM classification data to technical objects for new classes in the oneERP system
Jan 2024 - May 2024
5 monthsMainz, Germany
Freelance work
SThree
- Adjusting heating cost statements for various Aareon customers to the current rules of the HKVO heating cost regulation
- Supporting in the SAP RE-FX module
- Working with customers on S/4 HANA and earlier versions
Aug 2023 - Dec 2023
5 monthsWalldorf, Germany
Freelance work
Hays
- Organizing complex data transformations and migrations from two SAP ECC systems into one S/4 HANA system
- Tasks in SAP PM, MM, FI modules
Aug 2021 - Oct 2022
1 year 3 monthsLohfelden, Germany
Freelance work
CSE Consulting GmbH
- Consulting in SAP MM procurement
- Developing Fiori apps for purchase requisitions
- Designing an interface to transfer material data from external systems and assign EAN numbers
Jul 2021 - Jul 2022
1 year 1 monthHeidelberg, Germany
Freelance work
iPAXX AG
- Exchanging and processing payment request data between SAP ERP systems, AEPP, and customer apps (CRM) via a data portal
- Working with SAP ERP BK01
- Supporting rent payments in the real estate sector with SAP RE-FX
- Structuring and organizing data exchange through a Swagger data portal (OpenAPI)
Oct 2020 - Mar 2021
6 monthsBerlin, Germany
Freelance work
ECBM AG
- Data migration in SAP PM and MM into a MAXIMO IT system and a SAP Business ByDesign system
- Connecting the two systems via interfaces
- Using agile project strategies
Aug 2019 - Jan 2020
6 monthsFrankfurt am Main, Germany
Freelance work
HAYS AG
- Working with SAP ERP 2019 ABAP OO 7.50 OData services, CDS views, JSON formats
- Creating OData services in the PM area
- Providing data from the SAP backend to a frontend app, processing and storing data
- Using agile project strategies
Jan 2019 - May 2019
5 monthsBerlin, Germany
Freelance work
Vattenfall Europe Information Services GmbH
- Migrating data such as PM orders, MM material master data, QM notifications, PP bills of materials, etc., as part of a power plant carve-out
- Using LSMWs, RFC function modules, and ABAP OO
- Complex ABAP OO programming on a service provider portal, maintaining and uploading MM/SD data
Mar 2018 - Oct 2018
8 monthsEssen, Germany
Freelance work
ista International GmbH
- Complex customer-specific programming in the PM module in a real estate and energy context
- Using the Eclipse workbench for ABAP development
- Using Scrum and test-driven development methods
Mar 2017 - Jun 2017
4 monthsBochum, Germany
Freelance work
Vonovia AG
- Developing a cockpit for maintenance orders in the PM module
- Implementing customer-specific functions like mass dispatch, order creation, and release of MM purchase orders
- Complex ABAP OO programming
May 2016 - Aug 2016
4 monthsStuttgart, Germany
Freelance work
Ratbacher GmbH
- ABAP OO programming and customer-specific developments in the SAP FI module
- Test-driven development
May 2015 - Dec 2015
8 monthsBerlin, Germany
Freelance work
Mercoline AG
- ABAP programming in the SAP MM module
- Supporting interface programming
- Creating and editing master and transactional data in MM, SD, PP
- Using Excel files, BAPIs, and ALV classes
Aug 2014 - Mar 2015
8 monthsBerlin, Germany
Freelance work
50Hertz AG
- Applying SAP enhancement tools like user exits and BADIs
- Adapting standard processes to create MM purchase requisitions and purchase orders from PM orders
Oct 2004 - Apr 2005
7 monthsJülich, Germany
Freelance work
Forschungszentrum Jülich
- Interface programming in the MM module
- Migrating from SAP R/2 to SAP R/3 version 4.7 using BAPIs and file handling on a UNIX application server
- Creating reports in MM and CO with SAP Enjoy Controls
Jun 2002 - Oct 2002
5 monthsGermany
ABAP Developer
Hewlett Packard
- Developing interfaces to external servers
- Creating UNIX script files
- Providing material master data imports
May 2002 - May 2002
1 monthSwitzerland
SAP Consultant
Raiffeisen-Banken Schweiz
- Reporting in the MM and SD modules
Mar 1999 - Dec 2000
1 year 10 monthsGermany
SAP Developer
CLARIANT
- Developing and maintaining complex programs in MM (goods receipt) and SD IDoc
- Reporting in the MM module
- Performing a release upgrade and rewriting programs
Feb 1998 - Feb 1999
1 year 1 monthGermany
SAP Logistics Consultant
Siemens Business Services GmbH
- Certification and training as an SAP R/3 consultant in the MM module
- Training and projects in SAP logistics
General higher education entrance qualification
Gymnasium in Baden-Württemberg
Doctorate
Max-Planck-Institut Stuttgart
Diploma in Industrial Engineering
Technische Fachhochschule Berlin
Diploma in Chemistry
Universität Stuttgart
Languages
German
NativeEnglish
AdvancedEducation
Oct 1973 - Jun 1977
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General higher education entrance qualification · Germany
Universität Stuttgart
Diploma in Chemistry · Chemistry · Stuttgart, Germany
Technische Fachhochschule Berlin
Diploma in Industrial Engineering · Industrial Engineering · Berlin, Germany
...and 1 more
Certifications & licenses
ABAP Objects Developer
Siemens Business Services GmbH & Co. OHG
SAP R/3 Consultant Logistics
Siemens Business Services GmbH & Co. OHG
SAP Certification ABAP OO
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