Someone with the title CRO specialist is the person who's working on the optimization process of a website. There are different disciplines within CRO like for example UX design, user research, psychology, and data analyses. What they all have in common is that they focus on increasing conversions on the website, bind all of these skills together and you have a CRO specialist. A CRO specialist is somebody that comes up with ideas from data that can be tested on the website, writes the hypotheses, most of the time builds the tests and analyzes the tests afterward.