Gontikas began his professional career in 2016, in the
Greek Basket League club
Panathinaikos. He made his Greek Basket League debut on 13 November 2016, in an 80–65 win against
Kolossos. He was released from Panathinaikos on June 20, 2017. In August 2017, he agreed terms with
Apollon Patras. On June 26, 2018, he joined
Ifaistos Limnou of the
Greek Basket League. On July 18, 2019, Gontikas signed a three-year contract with
Peristeri. On July 31, 2020, Gontikas terminated his contract with Peristeri and signed a one-year deal with
AEK Athens. On August 16, 2021, Gontikas moved to
Ionikos Nikaias. In 15 games, he averaged 9.1 points and 5.9 rebounds per contest. On March 22, 2022, Gontikas moved to Romanian club
U FC Argeș Pitești for the rest of the season. Gontikas started out the 2022–2023 season with
Karditsa, but on January 20, 2023, he signed back with
AEK Athens for the rest of the season. In a total of 14 league games during the season with both clubs, Gontikas averaged 4.6 points and 2.2 rebounds, playing around 11 minutes per contest. On July 1, 2023, Gontikas signed a two-year contract with
Kolossos Rodou. On December 11, 2023, he moved to
Lavrio in an unofficial trade for
Kostas Papadakis. On June 11, 2024, Gontikas renewed his contract with Lavrio. Gontikas started the 2025–2026 campaign with Icelandic club
Þór Þorlákshöfn, before returning to Greece for
Panionios. ==National team career==