hi,

see from the past 3-4 years isro has been hiring engineering graduate for the position of scientist B or engineer. however the major hiring streams are electronics and communication engineering, Computer science engineering, mechanical engineering, electrical engineering. however it would depends on the organization and their possibility of hiring professionals.

however same thing is for drdo, so if you are currently in pursuing bachelors you should study sincerely for your course curriculum and learn latest technology to get best career option.