Following
Harry Potter, Fiennes Tiffin appeared in British television roles in
Private Peaceful (2012) and
Safe (2018), as well as a short independent film called
Possession with Intent to Supply (2016). In 2019, Fiennes Tiffin was cast in the lead role of Hardin Scott in the film
After. The film's success led to four sequels:
After We Collided (2020),
After We Fell (2021),
After Ever Happy (2022), and
After Everything (2023), in which Fiennes Tiffin reprised his role as Hardin Scott. The last three films were filmed simultaneously in Bulgaria in late 2020, due to the
COVID-19 pandemic. Fiennes Tiffin also played Brooks Gustafson in the
action-thriller film
The Silencing (2020), Jim Albright in the romantic drama
First Love (2023), and Henry Hayes in
The Ministry of Ungentlemanly Warfare in 2024. In 2026 he starred alongside his uncle
Joseph Fiennes as a teenaged
Sherlock Holmes in the
Prime Video series
Young Sherlock, directed by
Guy Ritchie. In addition to acting, Fiennes Tiffin has modelled for
Dolce & Gabbana,
Dior,
H&M,
Hugo Boss,
Fendi,
Oliver Peoples,
Superdry,
Ferragamo, and
David Yurman. His upcoming projects include
The Climb, a film based on the 2013
Greenpeace protest where activists illegally scaled
The Shard in London in protest against Arctic oil drilling,
Mr. Smith, a thriller in which Fiennes Tiffin's character returns to an Irish port to solve his brother's sadistic murder (written and directed by Declan O'Dwyer),
Above the Below, a thriller where Fiennes Tiffin plays an idealistic astronaut on a mission of survival following a botched re-entry to earth (starring opposite
Idris Elba who plays the mission's commander),
Picture This, and
Making Noise. ==Personal life==