On January 14, 2018, Mahaan signed a contract with WWE. On May 31, 2018, he made his in-ring debut, under the name Rinku, at an NXT live event in Tampa, in a loss to Kassius Ohno. On March 21, 2019, he began being managed by Robert Strauss at NXT live events.
On the March 25, 2020 episode of NXT, Rinku along with Saurav and new manager, Malcolm Bivens made their televised debut, attacking NXT Tag Team Champion Matt Riddle. The following week, Bivens would introduce their team name to be Indus Sher, while collectively being known as Bivens Enterprises. The following week, Indus Sher defeated Ever-Rise in their debut match.
On the May 10, 2021 episode of Raw, Rinku, with the new ring name Veer, along with Shanky, would align themselves with Jinder Mahal. As part of the 2021 Draft, Mahal and Shanky were drafted to the SmackDown brand while Veer remained on the Raw brand, ending their alliance.
Now a singles wrestler, vignettes began airing in November 2021 of a repackaged Veer, whose ring name was tweaked to Veer Mahaan. Despite WWE continually promoting his return to Raw, he spent months without appearing on Raw, although during this time he was also wrestling on WWE Main Event. Following months of promotion, Mahaan appeared on Raw on April 4, 2022, attacking Dominik and Rey Mysterio, establishing himself as a heel. Over the following weeks on Raw, Mahaan defeated the Mysterios in separate matches, and several local wrestlers who put up no challenge.
On the October 4 episode of NXT, Mahaan returned to the developmental brand, teasing a reunion with his former tag team partner Saurav, now known as Sanga. Mahaan returned to the main roster in May 2023, as he, Sanga, and Jinder Mahal were drafted to the Raw brand in the 2023 WWE Draft.
On April 20, 2024, Veer was released from WWE alongside Sanga and Mahal.