Born in Bishop Auckland,[1] Hemming attended St John's Catholic School.

[2] Hemming joined Darlington on a month's loan from Middlesbrough in October 2018, and made his debut in a 2–2 away draw at Bradford Park Avenue.

[4] In November 2019 he joined Blyth Spartans on loan, making his debut that month in the FA Trophy against Alfreton Town.

[7] Hemming helped Kilmarnock achieve promotion as champions to the Scottish Premiership during the 2021–22 season.

[8] He kept 15 clean sheets in 36 appearances and was named Kilmarnock's Young Player of the Year.