In modern times, Vietnamese scientists have made many significant contributions in various fields of study, most notably in mathematics. Hoàng Tụy pioneered the applied mathematics field of global optimisation in the 20th century, while Ngô Bảo Châu won the 2010 Fields Medal for his proof of fundamental lemma in the theory of automorphic forms. Since the establishment of the Vietnam Academy of Science and Technology (VAST) by the government in 1975, the country is working to develop its first national space flight program especially after the completion of the infrastructure at the Vietnam Space Centre (VSC) in 2018. Vietnam has also made significant advances in the development of robots, such as the TOPIO humanoid model. One of Vietnam's main messaging apps, Zalo, was developed by Vương Quang Khải, a Vietnamese hacker who later worked with the country's largest information technology service company, the FPT Group.