George Romanoff, the current heir to the Russian dynastic throne, has a LinkedIn profile. He seems to be a business consultant of some sort, in Europe. His colleagues endorse him for several skills, none of which are “ruling Russia” or “czaring.”
His dynastic name is Grand Duke George Mikhailovich of Russia, and his position in the family is Tsesarevich. This is not mentioned on his LinkedIn profile.
More formally, he’d be considered a “pretender” to the throne, and Grand Duke is a “title of pretense.”