Klubfiller is a UK hard dance producer from the United Kingdom, known for work in happy hardcore, UK hardcore and hard trance. Steven Brett develops his interest in music from an early age through learning guitar and piano, and later takes up DJing after getting his first set of decks at 12.

He spends weekends buying vinyl and builds contacts in the northern dance scene, including people at 3 Beat Records in Liverpool. In 2001, he decides to move from playing music to making it himself, then spends months learning music production. He also studies music technology at Liverpool Community College for two years and earns a national diploma.

After that, he gives tracks to local DJs, and they begin to get club and local radio play. Having first worked in other genres, he moves towards harder underground music and connects with hard house DJ Andy Whitby through DJ Kurt. This leads to his inclusion in AWsum alongside Cally Gage and Matt Lee, also known as Gammer.

Klubfiller continues to build a profile through productions and DJ bookings, and is also linked with AWsum tours. He plans an EP on AWsum and a new label called Defiance Recordings.