1990s: Early teen roles

In 1990, she began her career on television, appearing as regular cast member during the first season of the Canadian teen soap opera, Hillside.^[9]

Throughout the 1990s, she also played supporting roles in several made for television films and Canadian television series, such as Madison.^[9] She eventually made her feature film debut with a supporting role in Double Jeopardy (1999).

2000s: Transition into adult roles

Okuma began to transition from teenage roles to adult roles, with appearances on a wide range of productions, especially television. Okuma co-starred in the American crime drama series Sue Thomas: F.B.Eye from 2002 to 2005.^[10] She guest starred on various hit television series, including Dark Angel, Odyssey 5, Cold Case, Grey's Anatomy and NCIS: Los Angeles. She also had the recurring role as Marika Donoso on the seventh season of the Fox series 24.

2010s—2020s: Continued success

In 2010, Okuma began starring in the Global/ABC police drama series, Rookie Blue as detective Traci Nash.^[11] When being interviewed about how she got her role on Rookie Blue, Okuma said:

I originally auditioned for the part of Gail [played by Charlotte Sullivan] and Charlotte auditioned for Traci. When we got the parts, I said, "I think I would rather play Traci" and Charlotte said, "I think I would rather play Gail." Thankfully, the producers thought the same.^[12]

Okuma was cast as one of lead characters in the ABC pilot, The Adversaries, in 2015.^[13] That year, she also guest starred as Nia Lahey on the hit series How to Get Away with Murder.^[14]

She joined the series Workin' Moms in 2021 as recurring character Sloane Mitchell and became a regular the following season.^[15]