Astronomy

Dear Baby!
Currently, you are on the wrong path if you are willing to be astronaut and working in a IT company. The more sophisticated way is to continue your studies.
(1) Do your Master in Aerospace Engineering from Indian Institute of Space Science & Technology, Kerala.
(2) Hence after you MUST have to do Ph.D. in that particular subject from Indian Institute of Science, Bangalore. (*I hope you know why I am mentioning the name of specially these institution).
You know that Astronaut are not like regular employee for space organisation. They are specially build person hired (or trained) for a particular mission. So, don't think that ISRO or NASA or ESA are always recruit Astronauts. They don't do so, unless they plans a manned mission for space region or for ISS. Another thing I would like to say is about your physical fitness. You have to be 100% fit not just from your physic but also from your mind (mental stability). (#) Astronaut is not a position. So, there is no special degree for that. Your Steller academic background, your physical, mental, emotional, biological stability/fitness and the hardcore training will help you to be astronaut. (#) Be in contact with ISRO and its operations. B.Tech in CS is not bad but not a wise choice for Space Science. But this may helps you in Rocket Simulation.
Answer is quite long but I hope this helps.
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Good Luck.

Eligibility for M.Sc. in Astrophysics
The minimum eligibility required to be met for admission to the course is graduation completed with Science from a recognised university with a minimum aggregate score of 50%.
A few universities and colleges in India conduct entrance examinations for admission to the course.
M.Sc. in Astrophysics: Admission Process
Admission to the course is conducted in 2 stages:
Institutional Test.
Personal Interview- involving assessment of fitness, work experience, publications and statement of purpose. Most colleges admit students to the course on the basis of their performance in the relevant entrance test. Some institutions/ universities conduct their own entrance tests for offering admission. The admission process may s vary from college to college.