Kalongo was born in Canada to a South African mother and a Kenyan father.

[4] In September 2021, he joined Forge FC of the Canadian Premier League on a developmental contract.

[10] In October of the same year, he was a part of the Forge squad that won their fourth league title, following a 2–1 victory over Cavalry FC in the play-off final.

[13][14] He was named the Canadian Premier League Goalkeeper of the Month in April 2024.

[15][16] On January 2, 2025, Forge announced that they had exercised their option on Kalongo for the 2025 season.