He currently plays for Bayer Leverkusen Women, wearing the number 18 shirt. At the international level, he represents Germany Women U23. He plays primarily as a Defender.

Throughout the German Frauen Bundesliga 2025-2026, Julia Mickenhagen featured in 19 matches, averaging 1.5 tackles, 0.4 interceptions, and 1.1 clearances per game, while blocking 0.4 shots per game.