Tamar Kajaia graduated from Dimitri Arakishvili Music School Piano Department in 1982.
From 1983 until 1988, she studied at Vano Sarajishvili Tbilisi State Conservatoire Piano Department, where her teacher was Katrin Jijavadze.
Since 1988, she has worked at Vakhtang Chabukiani Tbilisi Choreographic School as an accompanist.
In 1989-2006, she taught music at No 6 Experimental High School, in 2006-2007 she worked as a director of Gardabani Music School and from 2012 until 2014 – as a music teacher at Tbilisi Academic School.
Since 2016, Tamar Kajaia has been the pianist and musical assistant at Giorgi Aleksidze Tbilisi Contemporary Ballet Chamber Company.