Poulianitis began his pro career with the Greek League club Aris Thessaloniki, in the 2013–14 season.
[5] On 16 August 2019, Poulianitis signed a two-year deal with the Greek club Kolossos Rodou, but he only spent one season with them.
In 23 domestic Greek league games, he averaged 4.8 points, 1.4 rebounds, 1.4 assists and 0.6 steals, while playing around 19 minutes per contest.
In 28 domestic Greek league games, he averaged 3.4 points, 1.7 rebounds and 1.3 assists, while playing around 14 minutes per contest.
His father Vangelis, is a former basketball player, who played in the Greek Basket League with Panellinios Athens and Philippos Thessaloniki.