Hello Subham! 

The basic & primary duty of a JE (ATC) is that of Air Traffic Control. They are initially provided a thorough Theoretical and simulated practical training at CATC (Civil Aviation Training College), Allahabad in ATC and other related subjects like Meteorology, Air Regulations, Air Technical, Air Navigation etc. based on International Civil Aviation Organisation (ICAO) requirements & syllabus. After successful completion of the Training Course and after passing the examinations, they are posted at some Airport, where they are put on double banking with some Senior  ATC Officer. Double Banking means they will be working under the overall control of the Senior officer to learn the local and General ATC procedures. Before giving independent charge of some ATC Unit, they are subjected to clear a number of tests & examinations.

At small airports, JE (ATC) can also be allocated additional work of Administration, Passenger Terminal, Security etc. apart from Air Traffic Control.

I hope you it.