 He was San Jose's third ever Homegrown signing to the first team, after Tommy Thompson and Nick Lima.Marcinkowski was then temporarily loaned to San Jose's USL affiliate Reno 1868 FC, and played his first game for the team in Reno's 3–4 loss to Swope Park Rangers on March 17, 2018.Marcinkowski has played for the United States' men's national team at multiple levels, earning 24 caps between the U14 and U18 levels.