Ruas signed with WWE in 2015. He was trained at the WWE Performance Center and made his debut in July 2016 during a house show, in which he teamed with Niko Bogojevic against Gzim Selmani and Sunny Dhinsa. He made his NXT debut in 2017 in a tag team match, teaming with fellow Brazilian Cezar Bononi against Angelo Dawkins and Montez Ford.
On the December 25, 2019 episode of NXT, a vignette aired detailing Ruas' redebut.
On the August 10, 2020 episode of Raw, Ruas made his main roster debut in a Raw Underground segment, an underground fight club hosted by Shane McMahon, where he defeated Mikey Spandex by knockout. As part of the 2020 draft in October, Ruas was officially drafted to the Raw brand. However, he was moved back to the NXT brand on November 18, when he lost to Kushida. On June 25, 2021, Ruas was released from his WWE contract.