Steffi was born in Malta. Having been involved in the performing arts since she was 3 years old she began acting professionally at the age of 19 when she joined the Malta Amateur Dramatic Club (MADC) and took part in a number of theatre productions. During the 2013 MADC One Act Play Festival, she was awarded the Best Actress award for her performance in Murder Play. Some other notable works include: Shakespeare's Much Ado About Nothing and A Midsummer Night's Dream, I'll Be Back Before Midnight, The Vagina Monologues, Image of an Unknown Young Woman and A Handbag. She has recently featured in a few of short and feature films; the latest being Do Re Mi Fa directed by Chris Zarb, and 13 Hours: The Secret Soldiers of Benghazi directed by Michael Bay.