Sebestyén is an advisor in KPMG's Sports Advisory and Football Benchmark team. Besides sports, his main focus is esports, which he has been involved in for more than 5 years, not only as an advisor but also as a player. His best achievement was winning the 2019 Hungarian National Esports Championship. At a professional level, he is mainly concerned with the economics, ecosystem and business model of esports in both a domestic and global context. During his career at KPMG, Sebestyén has been involved in a number of strategic and business advisory projects in the telecommunications, gaming, sports and especially football sectors.