IIST offers Postgraduate Programmes like:
M.Tech in Soft Computing & Machine Learning
M.Tech in RF & Microwave Engineering
M.Tech in Geo informatics
M.Tech in Optical Engineering
M.Tech in Machine Learning & Computing
M.Tech in Solid State Technology
M.Tech in VLSI & Microsystems
M.Tech in Materials Science & Technology, etc.
Opportunities depend upon ISRO Placements conducted by centralised recruitment committee. But ISRO doesn't conduct campus Placements like other companies. And CSE students do not have much opportunities in ISRO. However, we would suggest you to keep visiting their official website for relevant opportunites.