Hi Dipak

Will advice you to check the following link:

https://www.isro.gov.in/careers#

https://www.isro.gov.in/recruitment-of-scientist-engineer-sc%E2%80%99-with-be-btech-or-equivalent-degree-electronics-mechanical-and

https://www.isro.gov.in/recruitment-of-scientist-engineer-sc-electronics-mechanical-and-computer-science#

Keep tracking this website to know the dates.

All the best !