He is on the books of PK-35 Vantaa Women and wears shirt number 34. At international level, he features for Finland Women U17. His main role on the pitch is Defender.

Across the UEFA European U17 Women's Championship 2025-2026, Helmi Kupila appeared in 3 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.