After working as a software development engineer at Nortel-Netas(Istanbul) from 2007 to 2013, İsmail Ergün started to work as an ABAP application development consultant at 2013. Still he has been working as a freelancer SAP Abap Application Development Consultant with 10 years experience on SAP Abap.

ABAP Software Developer:Developed programs on ERP (SD, MM, FI, QM, PP, PM, BW) modules and IS-U (Legal, WM, FICA) modules.

Java Software Design Engineer· IMS & SSL & SIP PBX systems including J2EE, JSP, SERVLETS, XML, PERL&SHELL scripts, ORACLE PL/SQL and Web Services.· Planning/Development/Testing of new features of Genband Communication & Application Servers.· Development/Testing/Tracking of customer change requests.· Responsible for business critical change requests and complex code deliveries.· Providing JAR files to the customers for the emergency cases.

•Nortel Networks Optical Metro Ethernet products support engineer•Customer management on network/service lost situations.•Meeting with the customers to provide solutions to the current product issues.•Understand and implement the technical issues and connect them with the other operating departments•Testing new software releases and feature verifications•Contact to design team if the issues require software fixes.•Responsible to fix the Nortel OM3K and OME products based issues in Nortel customer’s live networks and Labs.