He currently plays for Swieqi United, wearing the number 13 shirt. He plays primarily as a Forward.

His most recent move was a from Swieqi United to Pieta Hotspurs on 2025-12-01.

In the Malta Premier League 2023-2024 season, Josiah Mallia scored 0 goals and provided 0 assists across 1 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.