11/11/2026 updated

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SAP IS-U Lead Consultant | ABAP & FI-CA Expert | Utilities

ISTANBUL, Turkey
Only remote
B.Sc., Information Systems Engineering, Kocaeli University
ISTANBUL, Turkey
Only remote
B.Sc., Information Systems Engineering, Kocaeli University

Profile attachments

Erdem Gunes - EN.pdf

SAP ABAPSAP FISAP HANASAP IS-USimple Object Access Protocol (SOAP)SoapUIObject-Oriented Programming (OOP)
SAP IS-U & Utilities Expertise
Deep expertise in SAP IS-U for the utilities sector, covering full-cycle module implementation including Billing & Invoicing (BIIN), Market Communication (MaKo), GPKE/WiM Processes, and Process Document Management (EADOC) across multiple large-scale energy projects.

SAP ABAP & ABAP OO Development
Extensive experience in SAP ABAP and ABAP OO development, including User Exits, BAPI, BADI, Batch Input, CDS, and AMDP, with a strong focus on performance tuning and code optimization within SAP ECC and S/4HANA environments.

SAP FI-CA & FoMa
Proven track record in implementing and managing SAP FI-CA and FoMa modules as part of full-cycle projects, leading the entire development process from design and coding through to testing and go-live support.

System Integration & Architecture
Solid knowledge in system integration and architecture within SAP landscapes, including the use of SoapUI, Postman (SOAP, REST), and interface technologies to ensure seamless connectivity between systems.

SAP S/4HANA & ECC
Hands-on experience with both SAP S/4HANA and SAP ECC platforms, supporting migration and implementation projects in the utilities industry.

Correspondence & Dunning Management
Practical experience in configuring and managing correspondence and dunning processes within SAP IS-U, ensuring accurate and timely customer communication.

EDIFACT & Deregulated Energy Market
Knowledge of EDIFACT standards and processes relevant to the deregulated energy market, supporting compliant data exchange between market participants.

User Training & Go-Live Support
Experience in conducting user training sessions and providing go-live support to ensure smooth system adoption and operational continuity after project delivery.

Technical Quality Management
Responsibility for overall technical quality management across software development lifecycles, ensuring all developments meet the highest quality standards in large-scale SAP utility projects.

Experience

Professional experience5 - 10 years
Freelancer since2026

Languages

EnglishFluentTurkishNative speaker

Project history

SAP IS-U ABAP Lead Consultant

E.ON | Utilities
ABAP development in the Master Data (MD) module in the context of GPKE and WiM MaKo.

SAP IS-U ABAP Lead Consultant

SW Kaiserlautern | Utilities
Error analysis and resolution within billing preparation (BIIN), including the identification and correction of MSCONS and EADOC processing errors to ensure seamless billing processes.

SAP IS-U ABAP Senior Consultant

SEDAS & SEPAS | Utilities
As part of a full-cycle SAP ECC Utilities project for SEDAS (distribution network operator) and SEPAS (energy supplier), responsible for managing technical processes and development activities. Ensured the software development lifecycle (SDLC) ran smoothly and adhered to the highest quality standards. Held overall responsibility for the quality of all developments as Technical Quality Manager.

SAP IS-U ABAP Senior Consultant

Baskentgaz / Enerya / Zorlu Enerji | Utilities
As part of a full-cycle SAP ECC Utilities project, responsible for managing technical processes and all development activities. Ensured the software development lifecycle ran smoothly in compliance with the highest quality standards. Led the entire development process (design, coding, and testing), particularly for the FI-CA, DM, MD, BI, and IN modules, and successfully delivered them end-to-end.

SAP IS-U ABAP Consultant

Various Energy Suppliers | Utilities
As part of a full-cycle SAP ECC Utilities project, took on the management of technical processes and development activities. Played a key role in ensuring that the software development lifecycle (SDLC) ran smoothly while adhering to high quality standards. Led all development processes (design, coding, and testing) for the FI-CA module end-to-end and successfully delivered them.

SAP IS-U ABAP Senior Consultant

IGDAS Gas Company | Utilities
As part of a full-cycle FI-CA project, responsible for managing technical processes and all development activities. Ensured the software development lifecycle ran smoothly in compliance with the highest quality standards. Led the entire development process (design, coding, and testing), specifically focusing on FI-CA and FoMa, and successfully delivered them end-to-end.

SAP IS-U ABAP Senior Consultant

ADM-GDZ Energy | Utilities
As part of a full-cycle FI-CA project, responsible for managing technical processes and all development activities. Ensured the software development lifecycle ran smoothly in compliance with the highest quality standards. Led the entire development process (design, coding, and testing), particularly for the FI-CA module, and successfully delivered them end-to-end.

SAP IS-U ABAP Senior Consultant

KMO Highway | Utilities
Led the overall IS-U support processes of the respective companies while also being actively involved in their day-to-day operations. Responsible for managing the customer management functions of these organizations.

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