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Wenxuan (Dan) Dan is a skilled data mining engineer currently working at 51job since May 2021, focusing on A/B test analysis and algorithm optimization for recommendation systems. Prior experience includes serving as a research assistant at The Bendesky Lab, where data extraction and cleaning from mice tracking data were performed, and as a data analyst at C3 Alliance LLC. Wenxuan also worked as a SAS programmer at Sino Credit Analytical Intelligence, analyzing credit card application data to detect fraudulent activities and optimize performance through data validation. Earlier roles include research assistant at City University of Hong Kong, contributing to a project on image classification using Convolutional Neural Networks, and a wealth management intern at China Dragon Securities Co., Ltd., where support was provided for high net worth clients. Wenxuan holds a Master of Arts in Statistics from Columbia University and a Bachelor of Science in Computing Mathematics from City University of Hong Kong.