I have a university degree. Do I still need a certification to get a job, or to grow in my job?
Yes. A certification is a direct indicator of your employability in a job and your fitness and readiness for joining and pursuing a profession. A university degree, on the other hand, is an indicator of your general intellectual capabilities and understanding of principles in the subjects you may have studied.
Put most simply, a Certification proves you can do a specific job well, or pursue a profession immediately because you have a baseline level of competence already; while a university degree proves you know and understand how to do that job well, or prosper in that profession – and hence you will need some special training to get exactly ready for that specific job or profession.
That is the reason Certifications on top of a university degree increase the perceived employability of an individual, as prospective employers are assured you can hit the ground running. That is also why most university students around the world today pursue certification programs in their interest areas simultaneously with their university studies, to get ready for a job by the time they graduate.