Marcinkowski played for the Georgetown Hoyas for three seasons, from 2015 to 2017, where he achieved a 0.84 goals against average (GAA) over 56 appearances.

[3] Marcinkowski signed a Homegrown Player contract with the MLS side San Jose Earthquakes on December 6, 2017, after spending four years prior to his college career with the team's academy.

He was San Jose's third ever Homegrown signing to the first team, after Tommy Thompson and Nick Lima.

[5] On January 16, 2025, Marcinkowski signed a two-year deal with LA Galaxy as a free agent.

[9] Marcinkowski was named to the final 20-player United States under-23 roster for the 2020 CONCACAF Men's Olympic Qualifying Championship in March 2021.