You can join Indian Army Software Engineering Devision. There are 3 ways of joining the army which You can prefer:

TGC-technical graduate certificate
In this entry, candidates are selected for SSB based on their aggregate/GPA up to their 6th semester. A merit list is drawn out every year based on the number of applications received and deciding the cut off lies at the discretion of the Army Headquarters.

SSC(tech): short service commission technical entry, Same procedure as above

CDS: Combined Defence Services
This entry comprises of a written exam and an SSB (subject to clearing of the written exam.) Basic Math, GK, English are the subjects which you need to study for the written exam.

But as you told that your age is 30 years so you need to check out whether you are eligible or not.

Good Luck!