On January 15, 2015, Miller was drafted in the second round (33rd overall) of the 2015 MLS SuperDraft by Seattle Sounders FC. Four days later however, Miller opted to sign with German Regionalliga side SVN Zweibrücken where he made 10 appearances. On July 9, 2015, Miller signed with USL club Seattle Sounders FC 2. He made his debut three days later in a 4–0 victory over Arizona United SC.

On December 12, 2017, Miller was selected by Los Angeles FC with the first selection in the 2017 MLS Expansion Draft. On March 4, 2018, Miller debuted in a match against his former team, the Seattle Sounders. Going on to win 1-0, Miller made 4 saves to keep a clean sheet.