There are many jobs available if you clear Gate exam like you can try for PSUs as they provide good number of vacancies for the same. Along with that, after IES you can try in below provided fields -
assistant executive engineer
executive engineer.
executive engineer selection grade
chief engineer level-2
chief engineer level-1
board member as in case of railway

Also, to check what all PSUs option you can have, you can go through the below article -

PSU Recruitment through GATE 2017

Hope this helps!!!!

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