Since March 2010 Kostya Tkacheshak acts as a lead singer in his duet “Flash”. In June 2010, the duo “FLASH” earns 1st place at the International competition “Slavic Crown” (Bulgaria) with the help of his irreplaceable choreographer Karina Doba. In August of the same year the first video clip for the song of the project “School Time” is made, which was rotated on many national TV and radio channels, including the prestigious O-TV channel. Since October 2010, Kostya starts working as the TV presenter at O-TV music channel – hosting a popular show “Multisvіt” which airs every weekday at 7-00.
In December 2010, Kostya takes part in the filming of the New Year’s concert, “First on the First” at the First National Channel, and also films his second music video for the song “Blame the New Year.”
In January 2011, Kostya begins his solo career under the stage name KoStya FLASH and shoots his video for the song “We are well …”
In March 2011, KoStya FLASH receives Grand Prix at the International Television Festival “TV-START”.
June 2011 – a tour in Sweden. July 2011 – a trip to the ICC “Artek
September 2011 – a music video for the song “I need you …” which was rotated on the national music channels in Ukraine and abroad:, RuMusic, KRATU, O-TV, Kherson, VTV and others.
In 2012, Kostiantyn moves to Kiev, where he meets with the musical director, choreographer Karina Doba, this event was very significant in the life of the artist. The creative tandem of the two brings great benefits: Kostya FLASH successfully participates in Junior Eurovision -2012, writing songs and recording videos “My diagnosis”, “key to paradise”, “universe”, “City”, which were in heavy rotation on the most popular musical TV channels of
Ukraine on-TV and RuMusic, as well as ELLO music portal on YouTube – the biggest YouTube channel in the world, where his song is included in the top 10.
KoStya’s music videos are included in the 3 best clips in the national charts. Kostiantyn gets invitations to take part in large-scale concerts, along with top Ukrainian pop stars such as “Zіrkovy rozgulyay” Palais of Sports “Miss Ukraine -2012” in the best concert hall of Ukraine “Crystall Hall”, concerts, dedicated to the Day of the city of Kherson, with the audience of more than 130 000 people, the Day of the city of Poltava, Fastova etc.