1. First register in National Career Services (NCS) portal subsequent to which you can apply.
3. After registration in NCS ports the you must visit the ISRO website at www.isro.gov.in to register your applications on-line.
5. During the registration Scanned copies of your latest passport sized Photograph and Signature in the prescribed file size is required to be uploaded in the application.
7. After the completion of application form, you will be provided an on-line Registration Number, which should be carefully preserved for future reference.
9. An NOC (no objection certificate) is also required from the employer concerned, by those already in employment under Central/State Government, Public Sector Undertakings or Autonomous Bodies.

Hii aspirants

let me clear your doubt.

After qualifing your btech degree you can join isro. To join iseo you have to give an examination called ICRB (centralized Recruitment Bangalore) is conducted by ISRO and individuals are tested as per their respective branches of engineering and afterthat interview is conducted.  If you qualify this also then you will be appointed as a scientist or an engineer at ISRO.

I hope my answer will be helpful for you

Good luck