Hill made his feature film debut in
Kenneth Branagh's
Belfast. The film's story is mostly told through the eyes of Hill's character Buddy, "a smart, cheery 9-year-old and a fictional version of Branagh himself", as described by Jeanette Catsoulis of
The New York Times. Hill was nine when he was cast as the film's lead out of 300 young actors who auditioned, ten when filming took place, and eleven when the film premiered in 2021. Hill also played the title role in the
World War II-set short film
Rian, which premiered at the 2021
CineMagic. In December 2021, Hill signed with
United Talent Agency stateside. In 2022, Hill attended Italy's
David di Donatello ceremony as a special guest, picking up the
Best Foreign Film award won by
Belfast. In the same year, he made his television debut in
Magpie Murders, a
BritBox and
PBS Masterpiece adaptation of the 2016
mystery novel of the same by
Anthony Horowitz. He also appeared alongside
Deirdre Mullins in the horror film
Mandrake. In September 2023, he appeared as Leopold Ferrier in Branagh's supernatural mystery film
A Haunting in Venice, based on
Agatha Christie's ''
Hallowe'en Party''. Hill portrayed Harry Vandergroot in the Amazon film
Holland alongside actress
Nicole Kidman, which was released on 27 March 2025. ==Filmography==