Foster's work includes Kayleigh Llewellyn's In My Skin (BBC), which won Best Drama at both the BAFTAS and the RTS Awards, Coky Giedroyc's feature musical based on the songs of Take That, Greatest Days, All or Nothing: Arsenal and ITV's animated family adventure series co-produced with Weta, Thunderbirds Are Go (written with his brother Ben Foster), for which they were nominated for a Bafta in 2016.

He has scored all of Derren Brown’s recent TV specials. His music also features in the Ryan Gosling / Michelle Williams film Blue Valentine, and in Raoul Martinez and Joshua Van Praag's Creating Freedom: Lottery of Birth, nominated for Best Documentary at the Raindance Film Festival. In film, Foster has scored Sam Hobkinson’s feature documentary Misha and the Wolves, which premiered at Sundance in 2021. Previously, his work was featured in Ryan Gosling's Blue Valentine and Creating Freedom - Lottery of Birth.

He also works as a composer of music for commercials; in this field, his work has won numerous awards for original compositions including D&AD, Clio, Craft and MAS. He has worked with directors including Jonathan Glazer, Joachim Back, Wim Wenders and Nick Gordon.

Other TV work includes scores for entertainment shows including The Cube, Bigheads and Penn & Teller: Fool Us.

He has also been involved in various music education initiatives, most recently Bafta Kids' Big School Day, held at Alexandra Palace.

Silva Screen Records has to date released two volumes of Nick & Ben Foster's score for Thunderbirds Are Go, performed by the City of Prague Symphony Orchestra.