Mientus was born in Pittsburgh, Pennsylvania, son of Jean Marie (née Gleeson) and Robert J. Mientus. He is of Polish, Italian, and Irish descent. Before starting his career in theatre, Mientus was a fan of the musical Spring Awakening. After seeing the show at the Atlantic Theatre Company, he created a Facebook group for his friends and himself to discuss the show on. However, Mientus began to notice strangers (fellow fans) were joining the group, and soon one of the producers from Spring Awakening contacted Mientus and asked him to make his group the official show Facebook page, which Mientus could moderate. He agreed, and was later recommended by the same producer to audition for the touring company of Spring Awakening. He left the University of Michigan after his junior year to be in the show, and never returned to graduate.
Mientus has toured with the first national touring company of Spring Awakening as Hanschen and in the 2010/11 international tour of Academy and appeared in the 2012 Off-Broadway revival of Carrie: The Musical. He made his Broadway debut in the 2014 revival of Les Misérables as Marius Pontmercy.
In February 2015, he was cast as journalist Brett Craig in Parade, for a one-night-only concert presentation at the Lincoln Center's Avery Fisher Hall. After finishing his run of Les Misérables in early 2015 and being succeeded by Chris McCarrell, Mientus moved to Los Angeles with fiancé Michael Arden, where he appeared in the show Bent at the Mark Taper Forum. He also reprised his role as Hänschen in the Deaf West production of Spring Awakening, directed by Arden. The production then transferred to Broadway, and closed on January 24, 2016.

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