When I started to work at Red Hat I familiarized with Red Hat Certification program. You can take an exam related to some Red Hat product and if you pass you will get a certificate. Red Hat exams differ form other certification programs in the industry. You get a system, e.g. RHEL, and you need to configure and fix it according to the tasks in the exam. Besides it has some milestones that give you motivation to take more exams.