Matthias O. - Freelance work

Berlin, Germany

Experience

Jun 2024 - Mar 2025

10 months

Frankfurt 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 months

Mainz, 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 months

Walldorf, 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 months

Lohfelden, 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 month

Heidelberg, 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 months

Berlin, 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 months

Frankfurt 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 months

Berlin, 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 months

Essen, 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 months

Bochum, 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 months

Stuttgart, 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 months

Berlin, 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 months

Berlin, 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 months

Jülich, 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 months

Germany