After completing her composition Master’s degree in France she studied at the prestigious Cursus IRCAM in Paris. Her Cursus piece Transduced (2020) for percussion and live electronics was presented at the big hall of the Center Pompidou. In Paris Justina Repečkait (b.1989) was an artist in residence at the Singer-Polignac Foundation, composer in residence with the ensemble Le Balcon conducted by Maxime Pascal and held a scholarship at the International Centre of Nadia and Lili Boulanger. Later, in Germany, she was an artist-in-residence at Villa Waldberta and at Schloss Wiepersdorf and at Darmstadt Summer Course 2021, together with 4 percussion players, she premiered her piece Pulsating Skin for 4 snare drums & electronics. 

Both her compositions Chartres (2012) for string orchestra and Tapisserie (2015) for chamber ensemble represented Lithuania in World Music Days and International Rostrum of Composers. Since 2015 she is a member of the Lithuanian Composers’ Union which awarded her the Debut of the Year prize.

In 2019 Justina’s music and interview were featured in Composer’s Portrait in Radio France show Création Mondiale for which she wrote a new composition Encierro, performed by saxhorn quartet Opus 333, whose recording was included in the list of the 15 best Lithuanian pieces of 2019. Her newest composition Weaving (2020) was broadcasted by ARTE television from the Grand Theatre of Provence.

Justina’s music is performed by such ensembles as Intercontemporain, Court-Circuit, 2e2m, Spectra, Asko/Schönberg, Ensemble for New Music Tallinn, OSSIA, Platypus, Ars ad hoc,  Lithuanian Ensemble Network, Ithaca College Contemporary Music Ensemble, SurPlus, Ensemble XXI Jarhundert and by BBC Philharmonic & Sinfonietta Riga orchestras. She is regularly commissioned by Gaida, the biggest contemporary music festival in the Baltics, for which she has composed several orchestral pieces. Additionally, her music regularly presents Lithuania in Baltic Music Days a festival that has been taking place in one of the Baltic states since 2021.

In 2024 Music Information Center of Lithuania is releasing Repečkaitė’s first portrait album. Justina’s compositions were already released in anthology albums like Between Music and Ritual (2021), Nouveaux Horizons (2020), 88+ (2020), ZOOM in 12 (2018),  Anthology of Lithuanian Art Music in the 21st Century (2017), Contemporary Music Series: Lithuania (2016), ZOOM in 10 (2014) and 30 Druskomanija Moments (2014).

In 2024 her orchestra composition Vellum (2020) is performed both at the Baltic and Estonian Music Days and at Paris Philharmonic.

In 2024 Repečkaitė’s composition La muë for serpent, children’s choir & electronics, a part of the project Janus, co-commissioned by Ircam & the Centre of Baroque Music Versailles, will be performed both at Ircam Espro and later, at the Royal Chapel of the Palace of Versailles.

In October, 2024, her composition for percussion and electronics will be premiered by Eklekto in Geneva. Justina will be composing music that combines ancient instruments with a dance to be performed during the Musica Nova festival in 2025 in Helsinki.