Hauer-King's first feature-length work was the title role in The Last Photo, which had its world premiere at the Edinburgh International Film Festival. In 2017, he played Laurie in the series Little Women and starred as Andrius Aras in Ashes in the Snow (2018) and as David in Postcards from London (2018). He also starred as Lucas in The Way Home (2019). His other roles include Song of Names and Tonight. His next job was the role of Harry Chase in the drama World on Fire (2019). On November 12, 2019, it was announced that King would play Prince Eric in the upcoming film adaptation of The Little Mermaid.