Yongfeng Liu is a highly-skilled software engineer with extensive experience in back-end languages, databases, and data-related fields such as Big Data, Information Retrieval, Data Mining, Natural Language Processing, and Machine Learning. He has studied computer science at top universities in China and the US, including Jilin University, Sun Yat-Sen University, and Penn State University.

During his career, Yongfeng has worked for notable organizations in the tech industry, such as Facebook and Tencent. At Facebook, he has worked as a software engineer, bringing his expertise to develop and improve the platform. Prior to that, he worked as a full-stack developer and research assistant.

Yongfeng is particularly interested in Hedge Fund, High-frequency trading, and Algorithmic trading, with extensive experience in areas such as distributed systems, large-scale software design, concurrent/multi-threaded programming, TCP/IP sockets, network programming, and ads product/measurement.

His skills in back-end languages like C++, C, Python, and PhP, and databases such as MySQL and Hive, have made him a valuable asset in the tech industry. He is also knowledgeable about social network analysis and has been involved in developing algorithms for efficient social network data mining.

In summary, Yongfeng Liu is a highly skilled software engineer with a diverse background and expertise in several data-related fields. With an impressive academic and professional history, he has made a name for himself in the industry and has contributed significantly to various organizations he has worked for.