He represented Great Britain from 2012 to 2016 and competed for the British Lionhearts squad at the 2015 World Series of Boxing competition (WSB).

Maxwell made his professional debut on 7 October 2016, scoring a four-round points decision (PTS) victory over Ibrar Riyaz at the Greenbanks Sports Academy in Liverpool.

[2] After compiling a record of 10–0 (8 KOs) he faced Sabri Sediri for the vacant WBO European light-welterweight title on 23 March 2019 at the Leicester Arena.

With less than 15 seconds to go and his opponent still neglecting his defence, Maxwell landed a solid right hand to leave Sediri sprawled out on the canvas.

[3] After a second-round knockout (KO) win over Oscar Amador in a six-round non-title fight in July,[4] Maxwell retained his title against Connor Parker with a seventh-round TKO in November.