Jonas Gladnikoff is a Swedish songwriter and music producer. Born in Täby, he began songwriting at an early age. Later in life he moved to Åland in Finland before eventually moving to Stockholm. He has written several songs for singers from across Europe, but is best known for writing entries for the Eurovision Song Contest, the Junior Eurovision Song Contest, and for various national pre-selections. He studied songwriting at the Music Production Academy Musikmakarna, graduating in 2006. He co-wrote the songs that represented Ireland in 2009, 2010 and 2014: "Et Cetera" performed by Sinéad Mulvey & Black Daisy, "It's for You", performed by 1993 Eurovision winning Niamh Kavanagh, and "Heartbeat" sung by Can-linn.

Ireland participated in the Eurovision Song Contest 2009 with the song "Et Cetera" written by Niall Mooney, Jonas Gladnikoff, Daniele Moretti and Christina Schilling. The song was performed by Sinéad Mulvey and the band Black Daisy. The Irish broadcaster Raidió Teilifís Éireann (RTÉ) organised the national final Eurosong 2009 in order to select the Irish entry for the 2009 contest in Moscow, Russia. Six songs faced the votes of four regional juries and a public televote, ultimately resulting in the selection of "Et Cetera" performed by Sinéad Mulvey and Black Daisy as the Irish Eurovision entry.