Hello Aspirant,

Hope you are doing good. In order to become a scientist or engineer in DRDO and ISRO you need to have a Bachelor's Degree in Science or Engineering or a three-year diploma in Engineering/Technology/Computer Science/allied subjects in the required discipline from a recognized institute. The recruitment of scientists to DRDO is done by the Recruitment and Assessment Centre (RAC) through any of the following avenues:

• Direct entry through scientist entry test
• Campus selection in educational research institutions
• Registration of students with scholastic aptitude (ROSSA)

For more information related to this do visit: https://engineering.careers360.com/articles/isro-drdo-barc-dae-how-work-here

Hope this helps.