nodemcu doesnt response in at command mode
Some points to note:


VIN should connect to 5V (it goes through the on-board 5V -> 3.3V regulator). If you connect VIN to 3.3V you will be starving the device of power.
The NodeMCU doesn't come with AT firmware installed. You will have to install it first before it will respond. 
If you have a NodeMCU why are you bothering with an Arduino? The NodeMCU can do everything (and more) that the Arduino can do (except it lacks IO).