RHCA is Red Hat’s Highest level certification earned by a Red Hat Certified Engineer (RHCE) or Red Hat Certified JBoss Developer who attained Red Hat’s highest level of certification by passing and keeping current five additional hands-on exams on Red Hat technologies from their respective concentrations. If you pass more than five, then you achieve a higher level of RHCA. For example, if you passed six exams beyond RHCE or RHCJD you would be an RHCA Level II.