• Designed and executed functional test and interfaces test covering all aspects of Core Network product;• Planned and executed redundancy test both on CPU level and system level;• Led and supervised performance test, overload test and benchmark test;• Developed performance test automation system;• Planned and organized customer acceptance test for China Mobile and Telenor Hungary;• Participated in the reviewing of system documents and product code;• Drafted routine testing documents including testing plans, testing cases and testing reports;• Used professional testing tools including Rational Clear Quest, Mercury Test Director and Spirent Landslide 7100.• Developed performance test automation system which reduced testing effort from 15 full days human work to 2 days automation work without supervision;• Designed and organised customer acceptance performance test with heavy traffic load and complex traffic model for China Mobile.

• Maintained the software of the private telephone network system;• Developed new functions of the private telephone network system;• Designed and developed service logic compiler of intelligent network system;• Tested services of intelligent network.