Barnum-Bobb began his career at Watford, playing for their youth team from 2012 to 2014.
On leaving Watford, he was signed by then-Cardiff City boss Ole Gunnar Solskjær and made his debut for the Bluebirds in the Carling Cup in August 2014.
He first joined Newport in October 2015 on a month`s loan, but after a successful spell, extended his stay until the end of the season.
He signed a full-contract with the Exiles in June 2016 which was extended for another year keeping him at the club until 2018.