Tech lead of designing internally used services and frameworks for improving developer productivity.Led the design and development of a highly scalable distributed load tests and regression tests management system used by developers across the company.Participated in the design and development of a cutting edge recording-playback API test framework for backend service integration test.Participated in the development of a company-wide service capacity/performance test framework, which is used for service capacity planning by developers across the company.Participated in the development of a company-wide graceful degradation system for core services in case of unexpected hardware resource insufficiency. Helped engineer manager making roadmaps and sprint plannings for multiple projects.

Developed internal test utility/common library in Python and Scala. Help establishing company-wide test infrastructure.Wrote internal tech blog on test frameworks/utilities/best practices.Worked closely with system back-end developers in agile projects. Made test plans in sprint planning and discussed testability of interfaces with service developers. Controlled service releases with automated CI tests and helped formulate automated service deployment processes.Designed and executed complex end-2-end tests involving interaction of multiple services and Hadoop job.

Developed Python test framework, an unittest library extension, used for executing RPC type of integration tests concurrently in large scale: https://github.com/twitter/unisharkDesigned and developed continuous integration tests in Python and Scala for system back-end Http/Thrift services.Developed load/stress tests for Http/Thrift services in Scala with Iago (https://github.com/twitter/iago) framework.Inserted code in Http/Thrift services to automate regression tests with Diffy (https://github.com/twitter/diffy) framework.Participated in code review.

Pursued Master's degree in Computer Science at Illinois Institute of Technology.

Designed and developed test automation framework for auto-testing web app based on all Open Source software such as Selenium and TestNG, which was successfully applied in the test automation of a retirement plan web app project and an experimental agile development project outsourced by DST Systems Inc. US during 2011 - 2012.Led 8 QAs to automate 5000+ manual test cases upon the test automation framework in 6 months, which reduced the workload of regression tests later.

Provided outsourcing test service for Huawei Technologies Co. Ltd. China. Developed auto-test scripts for functional tests on modules of telecommunication online charging system.