Sviackevičius graduated with MA from the Lithuanian Academy of Music and Theatre in 1999 (with Assoc. Prof. Zita Abromavičiūtė). 1998–1999 he studied at the Academy of Music in Lodz (Poland), with the accordionist and composer, Prof. Bogdan Dowlasz. 1999–2000 he attended the Sibelius Music Academy in Helsinki (Finland), with Prof. Matti Rantanen. 1999–2001 he pursued post-graduate studies at the Royal conservatoire in the Hague (Holland), with the world famous Prof. Friedrich Lips (Russia) and Johan De With (Holland).
Raimondas Sviackevičius is laureate of many national competitions. He participated in many international competitions (Citta di Castelfidardo, Pianello Val Tidone, Premio Internazionale per fisarmonica Stefano Bizzarri) winning many of them, he was first prize winner at the 9th international Premio Internazionale Stefano Bizzarri accordion competition, where he also received the “Golden Lyre” award in 2000.
As a soloist he has performed with the Lithuanian National Symphony Orchestra, the Lithuanian State Symphony Orchestra, Kaunas Symphony Orchestra, St. Christopher Chamber Orchestra, the Lithuanian Chamber Orchestra and Klaipėda Chamber Orchestra. He has given recitals, appeared in original programmes at the festivals Sugrįžimai, St. Christopher Summer Festival, Druskomanija, Klangspuren, Venice Bienalle, Gaida, Jauna muzika, Druskininkų vasara su Čiurlioniu, Turning sounds 4 and Muzikos ruduo as well as W. Lutoslawski Modern Art Forum in Lublin, Musica Moderna in Lodz (Poland) and Bayan I Bayanisty in Moscow, accordion festivals in Sanok (Poland), Chelyabinsk (Russia), among others.
Performing actively as a soloist he also plays chamber music and participates in various formations and unconventional groups playing experimental and avant-garde music as well as jazz. In 2004, he joined the contemporary music ensemble Gaida, and since 2009 has been actively involved in the Lithuanian Ensemble Network.
The list of his partners includes BSM trio (Bačkus (cello)- Sviackevičius (accordion)-Mikeliūnas (violin)), Sviackevičius-Bačkus Duo, The New ARTrio (Dobrovolskis (percussion, electronics)-Sviackevičius (accordion)-Pabarčiūtė (vocal)) with guest star from Tuva Sainkho Namtchylak (vocal), ACCOsax trio (Sviackevičius (accordion)-Maksimovičius (saxophone)-Gotesman (percussion)), Sviackevičius-Kirsenka Duo (acc-tuba), as well as Chordos String Quartet, Disobedient Ensemble and many others.
Sviackevičius regularly appears (in the past as a participant, now as a pedagogue) in international master classes, seminars and festivals. He has performed with great success in Germany, Latvia, Estonia, Finland, Denmark, Poland, Holland, Sweden, Austria, the USA and Russia, and has juried for the following national and international competitions: Klingenthal competition (Germany), A. Krzanowski International Competition (Poland), Premio Citta di Castelfidardo, Val Tidone International Music Competitions and International Stefano Bizzarri Accordion Prize (Italy), Coupe Mondiale (Slovak Republic, Hungary, New Zealand, Croatia, China).
Since 2000, Sviackevičius has been on a faculty at the Lithuanian Academy of Music and Theatre. Many of his students are winners of various international competitions, appear in various festivals, are actively involved in concert life where they are recognized as contemporary music adepts. He is also a pedagogue/expert at the Karoliniškės Music School.
Sviackevičius closely collaborates with Lithuanian composers, commissioning and performing new works for accordion. In 2004, he released his first solo CD entitled A Farewell to arms after Nomeda Valančiūtė’s work written for him. In 2006, he premiered the first Lithuanian Concerto for accordion and chamber orchestra Breakthrough by Žibuoklė Martinaitytė, which was dedicated to him. In 2007, he gave first performance of Promise, the first Lithuanian work for accordion and symphony orchestra by world renowned composer Feliksas Bajoras, at the Gaida Contemporary Music Festival. New Concerto for accordion and chamber orchestra AKO-07 by Jurgis Juozapaitis dedicated to Sviackevičius was premiered at Muzikos Ruduo festival in autumn 2007, and in 2009, Pažaislis Festival hosted a premiere of Elegy for Those Who Left Their Homeland for accordion and string orchestra by Giedrius Kuprevičius.
Recently, beside his performing career Raimondas Sviackevičius has been actively involved in organisation of various accordion events, and since 2008, he has been an artistic director of International Accordion Festivals in Vilnius and Palanga.