Rybacki began his coaching career while attending Jacksonville State in 2005, becoming a student assistant for the football team.[3] He served in that role from 2005 to 2008 before becoming a defensive assistant and cornerbacks coach in 2009, being in that position for two seasons before then joining the Louisiana Ragin' Cajuns in 2011 as outside linebackers coach.[1] He became the secondary coach for Louisiana in 2013, and helped the team win the Sun Belt Conference championship that year.[1] Rybacki joined the Central Arkansas Bears in 2014 as cornerbacks coach.[4]
Rybacki became the defensive coordinator and linebackers coach for the Nicholls Colonels in 2015 under head coach Tim Rebowe.[3] He served 10 seasons in that position under Rebowe.[3] In the 2024 season, he helped the Nicholls defense set the school record for rushing yards allowed, 83.9, which placed fourth nationally, and also coached the defense to force 29 turnovers which was the third-best mark in the FCS.[5] Rebowe retired as head coach following the 2024 season and Rybacki was named his successor.[6]