[1] April III began his coaching career in 2004 as a student assistant for the Louisiana–Lafayette Ragin' Cajuns.
[2] In 2007, April III became the special teams coordinator and inside linebackers coach for the Portland State Vikings through 2009.
[4][5] In 2018, April III returned to college football as outside linebackers coach for the Wisconsin Badgers.
[2][3] April III was defensive quality control coach for the Philadelphia Eagles from 2011 to 2012.
[8] In 2015, April III moved with Rex Ryan from the Jets to the Buffalo Bills and continued to serve as linebackers coach through 2016.