Mesto began his career in 2014, when he was only 15 years old and his official first release was the single “GO!”, a collaboration with Alex Ranzino which was released as a free download on November 10, 2014. Shortly afterwards, he released a remix with Benfield of “Rude”, a single by Magic!. He then collaborated with Mike Williams to release a bootleg of “Raise Your Hands” by Ummet Ozcan. He started 2015 by releasing a single titled “New York”. It was followed by his third single “Tokyo” in February. In April, he released a bootleg with of “Lean On” by Major Lazer and DJ Snake featuring MØ in April. The single “Rio” was released in May before the bootleg of “Satisfied” by Showtek featuring Vassy in September. Mesto’s single “Tetris (Truffle Butter Mashup)” was released as a free download on December 9, 2015. He was featured in production alongside Justin Mylo in Martin Garrix’s single “Bouncybob”, which was released as a free download on December 31, 2015.