He currently plays for Middlesbrough, wearing the number 27 shirt. At the international level, he represents Curacao. He plays primarily as a Forward. He stands at 172cm tall and weighs 69kg. His preferred foot is Right. His current market value is estimated at 3.5M €.

His most recent move was a Free from NEC Nijmegen to Middlesbrough on 2025-08-12. The reported fee was 3.5M €.

In the English Football League Championship 2025-2026 season, Sontje Hansen scored 1 goals and provided 0 assists across 29 appearances, averaging 0 goals per game with 10 shots attempted and 3 on target.