Koniaris began playing youth basketball during primary school, in 2006, after joining a local team in Akrotiri, Chania.

On 24 July 2014, Koniaris' agent, Tasos Delimpaltadakis, announced via Twitter, that Panathinaikos had signed a young point guard.

On January 16, 2021, after playing only friendly games and struggling for minutes with the Reds in the EuroLeague rotation, he went on loan to Monbus Obradoiro of the Liga ACB.

[7] On March 1, 2021, Koniaris left the Spanish club after a short spell of just 3 games in the Liga ACB.

On March 5 of the same year, he returned to the Greek Basket League for Ionikos Nikaias, once again on loan from Olympiacos, until the end of the 2020–21 season.

He was selected by head coach Ilias Papatheodorou to play at the 2015 FIBA Under-19 World Cup, but he was suffering from OCD in his right ankle, which ruled him out.