About

Qifei Shen is a Senior Machine Learning Engineer at UiPath with over 19 years of relevant experience. He is passionate about machine learning application and infrastructure, big data analytics platform, and distributed systems. Qifei is a deep learning practitioner with experience in training, optimizing, and scaling various types of ML/DL models and systems in production settings. He has practical system architecting expertise and has designed and shipped systems such as workflow engine, distributed key-value storage, and web application backends. Qifei has rich experiences in big data technologies and has built multiple data infrastructures involving Petabytes of data, supporting use cases such as data catalog, storage, and ETL pipeline. He has experience with Spark/Hadoop ecosystem and other big data platforms. Qifei is skilled in Spark, Hadoop, Kubernetes, PyTorch, Tensorflow, OpenCV, SQL, Python, Scala, Java, C++/C, JavaScript, web development, and AWS Services such as EMR, SageMaker, and DynamoDB. At UiPath, Qifei is working on visual document understanding using recurrent/transformers models with cross-modality features, image verification using contractive learning method, distributed training, and training data management. Prior to UiPath, Qifei worked at Amazon as a Senior Software Development Engineer, where he shipped many scientific projects related to Machine Learning/Deep learning, Economics, and Statistics. He has deep knowledge and hands-on experiences in computer vision DL model training/implementation, statistical model performance tuning, and big data infrastructures. Qifei holds a Master's degree in Optics and Electronics Instrumentation from the University of Science and Technology of China. He has led ambitious cross-org projects with data-driven decision-making approaches and practical roll-out planning. Qifei has led both senior and junior SDEs on moderate size projects, led design reviews committee in his org for years, and coached and helped to promote multiple engineers inside and outside his organization. He has conducted 200+ technical interviews as a technical interviewer and hosted 30+ interview loops as a bar raiser at Amazon. Qifei has been a top performer at his level over his career.