She has participated in masterclasses with Graciela Araya, Mark Tucker and Paula Chateauneuf, Ryland Davies, Muriel Corradini, Patricia MacMahon, Kenneth Montgomery, Carolyn Watkinson and Meinard Kraak. She currently studies with Jon Thorsteinsson.
In 2009 Rüütel became a member of the prestigious Jette Parker Young Artists Programme at the Royal Opera House, making her ROH debut as Venerable Lady in The Gambler and covering the role of Blanche. In the 09/10 season she sang Rosette Manon and Flora La Traviata and also performed these roles with the company when it toured to Japan with Antonio Pappano in September 2010.
In December 2010, Rüütel stepped in at the Royal Opera House for an indisposed Christine Rice as Hänsel in Hänsel und Gretel receiving critics’ praise for her performance. The Independent wrote “Kai Rüütel as Hänsel bristles with the grumpiness unique to boys on the cusp of puberty, her voice crisp and forthright”. Other roles included Second Lady Die Zauberflöte conducted by Sir Colin Davis, and Dorothée Cendrillon. She also covered Madame Dangeville Adriana Lecouvreur, Charlotte Werther and Dunyasha The Tsar’s Bride. Recent concert engagements include Mahler Rückert Lieder at the Cadogan Hall.
Engagements last season included her first return to Royal Opera House since graduating from the Jette Parker Young Artist Programme as Meg Page Falstaff in a new production by Robert Carsen, Hansel Hansel & Gretel for Scottish Opera, also a new production, and Marchesa Malibea Il Viaggio a Reims in a special gala performance for the Royal Opera House. She also made her Berlin debut at the Philharmonie with a programme of Zemlinsky and Mahler songs.
In the12/13 season Kai Rüütel returned to Royal Opera House as Wellgunde Der Ring des Nibelungen and made her US debut with the St Louis Symphony Orchestra singing Mozart Requiem. Other highlights include her City of Birmingham Symphony Orchestra debut with Beethoven Mass in C and a series of gala concerts in Riga. In the upcoming seasons she will make debuts with Nederlandse Opera, Théâtre du Capitole Toulouse, Dallas Opera and with Netherlands Radio Philharmonic Orchestra at the Concertgebouw Amsterdam.