The TV movie told the story of Sean Devereux, an aid worker who was murdered in Somalia in 1993 for criticising arms sales.
In 2010, Amini wrote an original screenplay for a film entitled Shanghai directed by Mikael Håfström and starring Chow Yun Fat, Gong Li, Ken Watanabe and John Cusack.
Amini was one of the screenwriters, along with Evan Daughtery and John Lee Hancock, who wrote the screenplay for Snow White and the Huntsman (2012), directed by Rupert Sanders and starring Kristen Stewart, Chris Hemsworth and Charlize Theron.
Additionally, Amini is one of the screenwriters, along with Chris Morgan and Walter Hamada, who wrote the screenplay for the film 47 Ronin (2013), directed by Carl Rinsch and starring Keanu Reeves, Hiroyuki Sanada, Tadanobu Asano, Cary-Hiroyuki Tagawa and Rinko Kikuchi.
Amini adapted John le Carré's novel Our Kind of Traitor into a feature film, directed by Susanna White.
[11][12][13] On 27 September 2019, it was announced that Amini would be writing the upcoming Obi-Wan Kenobi Star Wars series for Disney+.
His feature directorial debut, The Two Faces of January (2014), is a film adaptation of a Patricia Highsmith novel for which he also wrote the screenplay.