He has had recurring roles on several other American television series, including The Girl from Plainville (Hulu), WeCrashed (Apple TV+), The Endgame (NBC), House of Cards (Netflix), and as Hercules Mulligan on the final season of Turn: Washington's Spies (AMC).

He has had supporting roles in many films, including Steven Spielberg's The Post, The Good House, False Positive, The Kingdom, Julie & Julia, and All That I Am, which won the SXSW Special Jury Award for Ensemble Acting.

[7] His breakthrough came in 2014, when he landed recurring roles in Netflix's House of Cards, The Americans, and, most importantly, as the rabidly loyal - and notoriously cheap - cult favorite, "Dollar" Bill Stearn, on the Showtime series Billions.

[1][9] He has also appeared in other television series, such as The Bold Type, in which he played Jane Sloan's father during the show's final season, Madam Secretary, the NBC miniseries The Slap, Unforgettable, Person of Interest, Forever, The Following, Elementary, The Good Wife, White Collar, Gossip Girl, Blue Bloods, among others.

[12] AuCoin has appeared in numerous other Off-Broadway stage productions, including Manhattan Theatre Club's productions of Of Good Stock and Long Lost, and Signature Theatre's 2014 revival of A. R. Gurney's The Wayside Motor Inn, directed by Lila Neugebauer, which won him, and the rest of the cast, a special Drama Desk Award for "Outstanding Ensemble".