Stas Sagdeyev was born in 1986 in Odessa (Ukraine). In 1994 he entered Odessa Stolyarsky Special Music School playing the violin and luckily switched to playing the Viola in 2001 (class of Vladimir Malichkin). Taking part in the Festival of the Ukrainian Culture in Bern (Switzerland) in the same year became a turning point in his life. Stas has been an irreplaceable member of the quartet later known as the Stolyarsky String Quartet since its inception (2001) right until its subtle dissolution (2007).

In 2005, he graduated from the Stolyarsky school, and the same year entered Odessa State Nezhdanova Music Academy. In 2010 finished studies in Odessa.

Even though Stas had written a lot of material, none of it was made public due to different reasons. However, after starting collaborating with the guitar player Alex Vitkovskiy, trying to fulfil the long-time desire for songwriting and sound production he recorded, produced and released two singles: "So I Begin" (2011) and "Dreambird" (2012). The self-made music videos accompanied both.

Since 2011 till 2013 was studying at the Zurich University of the Arts (Switzerland) in the class of prof. Christoph Schiller. From 2012 to 2014 was studying sound technology and engineering in the class of Prof. Andreas Brüll at the ZHdK. While studying, had been frequently mixing JazzBaragge Wednesday Jam at Mehrspur music club. From 2014 till 2016 worked at the Odessa Philharmonic Orchestra (artistic director and principal conductor: Hobart Earle) as a viola player and as a freelance sound engineer.

In 2020 Stas composed and produced the soundtrack for Olga Polonskaya's feature-length documentary about the architect Sergey Babushkin "Vyshe nado stroit, vyshe!".

From 2017 to 2022 was working as the principal violist at the Odessa National Academic Theatre of Opera and Ballet. Stas is also the principal viola player at the Zakhar Bron Chamber Orchestra since 2011.