At international level, he features for Poland U16. His main role on the pitch is Forward.

His latest transfer saw him join Miedz Legnica II from Pogon Szczecin II via on 2025-07-22.

During the International Club Friendly 2025 campaign, oliwier siniawski made 1 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.