Xu Si is a Senior Data Scientist at WalmartLabs, where she works on the end-to-end project in fraud prediction for Walmart transactions that prevents millions of revenue loss due to fraud every year. Her current research area is in applying graph deep learning on entity scoring and linkage prediction in customer activity (e.g. transaction, login, profile change) based graphs. In the Walmart Hackathon held this March, she led a team of three to win the Best in Execution Award, one of the top three awards out of 70+ teams participated. Prior to this job, she obtained her master’s degree in Electrical Engineering at Harvard University in 2018. During her master study, she was the teaching assistant for Prof. Ba’s course Biological Signal Processing and was honored the Distinction in Teaching awards. She was a Data Scientist intern at Microsoft in the summer of 2017 where she designed and deployed an NLP model to recommend math questions to teachers in K12 math classroom.