| Youth Bundesliga Süd/Südwest 2018/2019 - Appearances as Referee |  |
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| 07/04/2019 | FSV Frankfurt | - | VfB Stuttgart | 1:2 | 2 | - | - |
| Youth Bundesliga Süd/Südwest 2018/2019 - Appearances as Referee | |
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| 07/04/2019 | FSV Frankfurt | - | VfB Stuttgart | 1:2 | 2 | - | - |
| Complete name: | David Markus Koj |
| Born: | 26/09/1993 |
| Place of birth: |
Germany |
| Residence: | Wegberg |
| Nationality: |
Germany |
| Profession: | Beisitzer |
| Club: | Sportclub Wegberg 1912 |