Born into a family of Serbian and Russian musicians, Xenia studied with Rostropovich, Fournier, Navara, Sebȍk and Végh. She made her debut at age 9 with the Belgrade Philharmonic Orchestra, and has performed as a soloist with the London Philharmonic, Budapest Philharmonic, Ljubljana Philharmonic, Madrid Radio, RSO Berlin and Copenhagen Radio orchestras. She has recorded the Beethoven, Brahms, Chopin and Frank cello sonatas, and the complete Bach Cello Suites. Several works has been written especially for Jankovic, and she has premiered music by Serbian composers. She is a member of the Hamlet Piano Trio, performing on both modern and period instruments, which has recorded Beethoven, Schubert and Mendelssohn piano trios, and is also cellist of the Uriel Quartet. In 2020 she founded Ensemble Inspirimus, performing cello concertos in smaller formations. Since 2004, she has been Professor at the Hochschule für Musik Detmold. She plays an Antoniazzi cello (ca. 1730).