stručan

1. (of a person) skilled; expert; competent
   Tražimo stručnog i odgovornog radnika. — We are looking for a skilled and responsible worker.
   On je vrlo stručan u svojoj oblasti. — He is a real expert in his field.
2. professional; specialist; expert
   Za ovaj posao potrebna je visoka stručna sprema. — This job requires a university-level qualification.
   Obratite se za stručnu pomoć psihologu. — Seek professional help from a psychologist.

Stručna sprema means level of education or qualification and often appears in job ads.