After graduating from vocational school, Hlavenka studied thermal and nuclear power at the Brno University of Technology (VUT). Upon graduation in 1989, he went straight into business. He co-founded and directed the publishing house Computer Press, publishing academic and expert literature in the fields of information and communication technologies. Computer Press was the sole representative at the time and the main Czech publishing house in this field. By the end of the 1990s, he contributed to the creation of many innovative activities on the Internet, such as the first Czech e-shop (Vltava.cz), the first auction platform and successful penetration into the European and international markets in the area of e-books and e-music sales. He was a partner in Ostrava NetDirect, one of the biggest producers of e-shops in its region and helped in selling the company to the multinational group, Naspers. He has been a serial investor since the 1990s, in which he has invested in approximately 15 startups, most of which in high-tech fields. One of the most successful projects is Kiwi.com, which he co-founded and became one of its first investors. The company reached a turnover of over 25 billion CZK in seven years and has over 3,000 employees. It represents a global leader in the field of virtual interlining for airlines. Included among other interesting investments, is FaceUp, a company which engages in combating bullying online.