Adewumi started his senior career with Austrian side Floridsdorfer AC, making more than 50 appearances over four seasons.

[3][4][5] On 30 August 2024, Adewumi joined the academy of EFL Championship club Burnley, signing a four-year deal with the Clarets.

[6] On the same day that he signed for Burnley, Adewumi immediately joined Scottish Premiership club Dundee on loan until January 2025.

[8] On 5 October, Adewumi scored his first goal for the Dark Blues in a league game at home against Kilmarnock.

[13] In September 2024, Adewumi made his debut for Austria U21 in a UEFA U21 Euro qualifier against Bosnia and Herzegovina U21, assisting one goal in an away victory.