Vega Maščinskaitė was born in 1971 in Kaunas. In 1991, she graduated (cum laude) from the Kaunas Juozas Gruodis Conservatoire, where she studied singing under Gerutė Stračkaitytė. She then went on to study with Professor Irena Milkevičiūtė at the Lithuanian Academy of Music and Theatre, from which she graduated in 1998.

While still a student, Maščinskaitė frequently participated in various musical projects. In 1994, she was a prizewinner at the Competition for Young Singers in Kaunas. She has attended master classes with Josef Loibl in Munich (2000) and Austria (2001), where she was awarded the title of the best performer, and took courses with H. Siffert in France. She regularly participates in Musica Sacra projects and has given concerts in Slovakia, Poland, Germany, France and the Czech Republic. With the Virgo Choir, she has sung in many European cities. At present, she is honing her skills under the guidance of Professor Virgilijus Noreika.