Previously, he was best known for his work in Combat Zone Wrestling (CZW), where he is a one-time CZW World Heavyweight Champion, two-time CZW World Tag Team Champion, one-time CZW Wired TV Champion, and 2005 Chris Cash Memorial Battle Royal winner. He also worked for other independent promotions including Chikara, Pro Wrestling Guerrilla, and Evolve.
On May 7, 2016, Gulak defeated Tracy Williams at Evolve 61 to qualify for WWE's upcoming Global Cruiserweight Series tournament. The tournament kicked off on June 23 with Gulak defeating Harv Sihra in his first round match. On July 14, Gulak was eliminated from the tournament by Zack Sabre Jr.. Gulak appeared on the September 14 episode of NXT, losing to Hideo Itami. On the September 26 episode of Raw, Gulak made his main roster debut, teaming with Lince Dorado in a losing effort to Cedric Alexander and Rich Swann.
- Championship Wrestling from Hollywood Heritage Tag Team Championship
- Combat Zone Wrestling World Heavyweight Championship
- Combat Zone Wrestling World Tag Team Championship
- Combat Zone Wrestling Wired TV Championshi
- DDT Pro-Wrestling Ironman Heavymetalweight Championship
- Evolve Tag Team Championship
- United Wrestling Network Tag Team Championship
- WWE Cruiserweight Championship
- WWE 24/7 Championship