He currently plays for Sportfreunde Lotte, wearing the number 39 shirt. He plays primarily as a Defender. He stands at 183cm tall and weighs 78kg. His current market value is estimated at 50K .

His most recent move was a from SV Rodinghausen to Sportfreunde Lotte on 2025-07-01.

Throughout the German Regionalliga 2025-2026, J. Riemer featured in 20 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.