In May 2018, Quinn signed a contract with WWE. On April 24, 2020, he made his on-screen debut on SmackDown, losing to Sheamus. On July 16, 2021, Quinn would team with Odyssey Jones in a losing effort to Austin Theory and Harry Smith in a dark match which took place prior to SmackDown. He officially debuted on NXT on August 24, in an upset victory over Boa. On September 3, Quinn defeated Andre Chase in his 205 Live debut and would return to the brand on September 24 with a victory over Oney Lorcan, and defeated Lorcan for a second time on NXT 2.0 four days later.
Quinn then had a brief feud with Robert Stone after putting him through a table at NXT Halloween Havoc, leading to him being challenged the next week, where he sung and danced to Shawn Michaels' theme, and beat Stone in a quick match. On the November 9 episode of NXT 2.0, he garnered the attention of Elektra Lopez and Legado del Fantasma, who wanted him to join the group, but refused her offer, leading to returning leader Santos Escobar taking him out on the following week's episode. This led to a match on the December 7 episode of NXT 2.0, where Quinn lost to Escobar after Lopez distracted him with a pair of brass knuckles. Quinn began interrupting Legado del Fantasma's matches in the following weeks, leading to another encounter with Escobar on the January 12, 2022 episode of NXT 2.0, where Lopez interfered and cost Quinn the match. On the February 25 episode of NXT Level Up, Quinn lost against James Drake.
Quinn soon started getting involved with Draco Anthony and his feud with Joe Gacy and Harland, when Anthony snapped at him for trying to cheer him up, leading to a match on April 12 episode of NXT, where Quinn defeated him. The following week, Quinn confronted Wes Lee for making fun of his "run it straight" philosophy, leading to a match later in the evening, where Quinn won. On the May 10 episode of NXT, Quinn turned heel after confronting Nathan Frazer. Two weeks later, he taunted Lee after his match with Sanga, but backed down when the latter pulled him away. On the May 31 episode of NXT, Quinn fought Lee in another match but lost.
On September 20, Quinn confronted Quincy Elliott celebrating his debut win from last week, giving him advice on how to be a superstar by imitating him. After defeating Hank Walker on the October 4 episode of NXT, he attempted to take out Walker but was stopped by Elliott and left the ring. Two weeks later, Quinn attempted to coerce Shotzi into being her co-host for Halloween Havoc, but was interrupted by Elliott, who wanted the same job as him. This led to a match where Quinn lost against Elliott after his attempt to cheat was thwarted by Walker. Quinn made his first main roster appearance on the November 10 episode of Main Event with a win over Akira Tozawa. On the March 23, 2023 episode of NXT, Quinn competed in a twenty-man battle royal to claim a spot in the fatal-five-way NXT North American Championship match at Stand and Deliver, being eliminated by Oro Mensah.
During the WWE Draft in April 2023, Quinn was announced as a free agent, meaning that he could appear across both Raw and SmackDown. On the May 15 episode of Raw, Quinn competed in a battle royal to determine the number one contender to Gunther's Intercontinental Championship at Night of Champions, being eliminated by The Viking Raiders (Erik and Ivar). After almost a year of inactivity, Quinn lost to Bron Breakker in a six second squash match on the March 1, 2024 edition of SmackDown. On April 19, Quinn was released from WWE.