He played college football at Campbell and was signed by the Los Angeles Chargers as an undrafted free agent.
[1] He attended Northeast Guilford High School in McLeansville, North Carolina, and lettered in football and basketball.
[3] In the COVID-19-shortened 2020 season, Allen played all four games and repeated as an All-Big South selection, having led the team's defensive line in tackles with 17.
[2][4][5] In his final season, 2022, Allen was named second-team All-Big South despite playing only eight games, as he recorded 22 tackles, 7.5 TFLs and 4.5 sacks.
[8] He went unselected in the 2023 NFL draft, but afterwards signed with the Los Angeles Chargers as an undrafted free agent.