Before joining "Fate: The Winx Saga," Hardwicke begins his acting career with early film work, including a role in "The Eclipse," and later trains at The Lir Academy in Dublin. He returns to screen acting with roles in projects such as "Vivarium" and the television series "Krypton," building experience across film and television productions.

Hardwicke gains wider recognition for his role as Rob Hegarty on "Normal People," followed by appearances in series such as "Smother" and "The Sixth Commandment." These roles establish him within television drama and allow him to work with a range of directors and ensemble casts across different productions.

Outside of "Fate: The Winx Saga," Hardwicke continues acting in film and television, including roles in projects such as "Lakelands" and "About Joan." He also participates in theater and continues to build his career across multiple mediums in the entertainment industry.