Is Stex exhange team currently three people? The rest still has to be hired?
Of course not. A lot more people are working in STeX and as the project is getting more speed they hire more people. Three people are the core developers/founders only that are mentioned on their website.
More information for you:
Currently, the STeX.Exchange team has 12 individuals working on the project and is rapidly growing. they are adding more staff as needed. At the moment only three core people are public persons. The rest of the team is not disclosed since they are paid salaries and they dont want their competitors to meddle with this.
Especially Nicholas Prays, A founder of a renowned KeyCAPTCHA which was a candidate for buyout by Google.