Hrvy’s music career began on 20 December 2013 with the release of his first single, “Thank You”. In May 2014, he was a support artist for Little Mix during the Salute Tour, alongside girlband M.O. After signing with Virgin EMI in February 2017, he released the debut Holiday EP which featured the singles “Holiday” and “Phobia”. In November 2017, Hrvy released the Talk to Ya EP, which included the single “Personal”. In February 2018, he was named in The Courier and Newcastle Student Radio’s The Sounds of 2018 at number six, alongside Rex Orange County, Brockhampton and SG Lewis. In April 2018, Hrvy was a support artist for The Vamps during the Night and Day Tour alongside Jacob Sartorius, New Hope Club, Maggie Lindemann and Conor Maynard. On 25 April 2018, he released the single “Hasta Luego”, featuring Cuban-American singer Malu Trevejo. In August 2018, he received his first Brazilian awards nomination, he was nominated for the BreakTudo Awards 2018 in the International New Artist category. In September 2018, he released “I Wish You Were Here” which was promoted with a performance at BBC Radio 1’s Teen Awards. Hrvy was also named on BBC Radio 1’s Brit List at that time. That year, he was listed in CelebMix’s Top Success Stories of 2018, alongside his management company Alphadog Management.

Hrvy is a former student of the Leigh Academy in Dartford, Kent, leaving in 2015.

In June 2019, he collaborated with South Korean group NCT Dream under SM Entertainment. The song, “Don’t Need Your Love”, was released on 6 June 2019. On 20 November 2020, Hrvy was set to release his debut studio album, Can Anybody Hear Me?; however, the album was ultimately cancelled.

Cantwell appeared as one of six presenters of the CBBC television show Friday Download for Series 7 to Series 9. On 26 February 2020, he appeared in an episode of the CBBC singing show Got What It Takes? by surprising the contestants as they were learning his own song “Personal” for that week’s sing-off. He was also a mentor in the same episode during a music video challenge.

In September 2020, it was announced that he would be competing in the eighteenth series of Strictly Come Dancing. He was partnered with Janette Manrara.