Soon after, he began taking private lessons with Margarita Molchadskaya, former pedagogue of the central specialized school for gifted children at the Saint Petersburg State Conservatory, named after Nikolai Rimsky-Korsakov.

While still a student at Grosse Pointe South High School, Moshchuk became the first Michigan resident to receive the Gilmore Young Artist Award.

[3] Following his appearance with the South Carolina Philharmonic in 2007, the Columbia Free Times praised Moshchuk for playing the Rachmaninoff Second Concerto with "immense verve and rewarding sonorities," and gave him "only the highest marks for accuracy, musicality, command, technique and sensitivity".

The Kalamazoo Gazette noted Moshchuk's "rare combination of breathtaking technique and genuine musicality,"[4] selecting his solo recital as part of the Gilmore Rising Stars Series as a favorite of 2011, alongside artists such as Radu Lupu, Yo-Yo Ma, and Anthony McGill.

"[5] Watching a recording of Moshchuk being interviewed for a public radio television program, Great Lakes Chamber Music Festival Artistic Director and pianist James Tocco claimed to have been "struck by how intelligent this young man was" as well as "the power and beauty of his playing.”[6] In CVNC: An Online Arts Journal in North Carolina, a writer wrote of Moshchuk's all-Chopin performances and compared him to legendary pianist William Kapell: