Software Engineer @ • Worked in the ads prediction team. Responsible for improving and maintaining machine learning models for predicting click and conversion rates • Project lead for light pCTR model o Optimized and launched new conversion model which increased mobile app installs o Performed detailed analysis of logs using Hadoop jobs in Scala to analyze model performance and identify potential areas of improvement • Measured system bottlenecks through profiling and loadtests, and improved system efficiency accordingly From October 2014 to Present (1 year 3 months) San Francisco Bay AreaSoftware Engineer Intern @ • Improved the ads ranking flow by implementing a new model at a different stage of the ranking flow, and using the experimental results to analyze which components can be optimized • Created model to predict the effect of changing parameters on ads revenue, using logged data in Apache Hive From June 2011 to August 2011 (3 months) Financial Modeling Group Intern @ • Calibrated European government curves to liquid bond prices using new monotone spline methodology • Achieved more robust and accurate model by implementing it and testing it extensively against existing model through various metrics and graphs From June 2010 to August 2010 (3 months) Software Developer Intern @ • Enhanced functionality of flagship job-scheduling product Platform Process Manager From May 2008 to August 2008 (4 months)

Master's Degree, Computer Science @ Harvard University From 2011 to 2013 B.A., Mathematics, 3.98/4.0 @ Columbia University in the City of New York From 2007 to 2011 Jiayang Jiang is skilled in: Computer Science, LaTeX, Machine Learning, Algorithms, R, Python, C, C++, Statistics, Java, Unix, PHP, Android Development, SQL, Web Development, TCP/IP, Git, Shell Scripting, Matlab