Hi Tushar,
After login which page opens(Role based page) -> Go to on that page -> take a dataview -> take datasource as nanoflow -> inside this nanoflow take a retrieve & retrieve account by database in the range select first and in the xpath write this [id=[%currentuser%]] -> return this object -> inside dataview show your current user full name or do what you want.
place a microflow timer or action scheduler and configure it to run a nanoflow once after a short time (e.g. 500 ms)