ISRO recruits Mechanical , CSE and Electronics Students from Top IITs like Bombay and Kharagpur during the Campus Recruitment and rarely does open for Aerospace, Civil or Materials Engineering. Incase you are in a Top IIT and are interested in joining ISRO with Aerospace Major you need to separately apply through Vacancy Portals. More or less there are Vacancy Tenders round the year, though the preferred candidature is for Post Graduates.
If you are seriously interested in joining ISRO, you should apply for IIST Trivandrum. The Institute is directly under Department of Space, Government of India and is mentored by ISRO. More than half of its batch each year from Aerospace, Physics, Avionics and Electronics are directly inducted into ISRO, based on their performance.
For more information do follow the link below
https://www.careers360.com/university/indian-institute-of-space-science-and-technology-thiruvananthapuram
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