In December 2015, he was named to the roster of Germany's U18 Men's National Team and helped the team win the 2016 Albert-Schweitzer-Tournament. He helped the German U18 squad to a fourth-place finish at the European Championship in December 2016, averaging 5.0 points and 5.2 rebounds a contest. Seeing action in all seven games during the 2017 FIBA Under-19 Basketball World Cup, Olinde posted 9.4 points and 5.3 rebounds a game en route to a fifth-place finish. He helped Germany win bronze at the 2018 FIBA Europe Under-20 Championship, averaging 7.3 points and 7.1 rebounds throughout the tournament.