[2] He stayed with Silicon Valley SA until 2018 when he briefly joined the Portland Timbers youth academy.
[2] Mbumba joined National Independent Soccer Association club Oakland Roots prior to the 2020 Spring Season and played in their opening match against Chattanooga FC.
[1] In the club's opening match of the season on 8 May 2021 against Phoenix Rising, Mbumba came on as a 78th minute substitute in the 3–0 defeat.
[4] On 2 June 2021, Mbumba scored his first goal for Oakland Roots during their 3–3 draw against Sacramento Republic.
[6][7] Mbumba joined the USL League One team, Spokane Velocity, for its inaugural season in April 2024.