May 2011 – Feb 2015 · 3 yrs 9 mos · San Francisco

• Managed Insights Analytics team and Ad Server team for design, development and maintenance of both systems.
• In charge of the engineering of in-house technology responsible for delivering and reporting $150M+ revenue annually.
• Worked closely with product, architecture and QA teams to make sure the dev teams deliver high quality product to the business on a timely manner.
• Advocated a sustainable process within the team for designing and developing products with high scalability, availability and maintainability.

Jun 2009 – May 2011 · 1 yr 11 mos · San Francisco

• Main contributor for Insights analytics system, a reporting system for both publishers and advertisers, including big data ETL, aggregation and reporting, using Ruby on Rails based on Greenplum DB and Riak cluster.
• Led the effort of the migration of Insights analytics system from Infobright DB to Greenplum DB, as well as the optimization work of SQL query performance, data storage strategy in both relational and NoSQL DB.
• Participated in the design and development of Undertone Ad Server, which serves $200M+ impression annually, using C/C++ with Apache, and CouchBase on Linux.

May 2007 – Dec 2007 · 7 mos · Shanghai

• Worked as one of the only two dedicated load & performance engineers for the 350+ engineer org, and acted as a guardian of system performance for all projects delivered by this group.
• Analyzed each and every project for the risk of performance degradation, and designed different strategies for load and stress testing different projects and features.
• Performed system analysis from the perspective of load & performance, such as JVM static memory usage, I/O requests for database, CPU time, frontend rendering time, etc.

Feb 2006 – May 2007 · 1 yr 3 mos · Shanghai

• In charge of automated functional testing of Kodak Computed Radiography(CR) product. Provided support to the whole team in the area of automated testing.
• Created an event-driven automated testing framework for SQA team using VBA in Test Partner, which shortened regression testing cycle for more than 30% for Kodak CR system.
• Performed Unix shell script based functional testing for Kodak System IV CPE project.

Jul 2003 – Feb 2006 · 2 yrs 7 mos · Shanghai

• Performed quality assurance planning and resource management, also led a team of 6 engineers.
• Set up a new process of software engineering for the company, which led to significant improvement of progress tracking and risk management.
• Introduced automation testing methodology to the company, using LoadRunner as load and performance testing tool, and WinRunner as functional testing tool, which improved testing efficiency up to 15%.