After Completing CSE :
1) You can try for GATE and if you got high score then you can make a entry into ISRO,DRDO etc.
2) New India Assurance Company Limited for the post of Post Administrative Officer (Scale I).
3) Bharat Sanchar Nigam Limited for the Post of Associate Server Maintainer.
4) Cabinet Secretarial Govt Of India Jobs for the Post of Deputy Field Officer.
5) Also you can try for Railway, Bank jobs etc.
But as no. of vacancies in govt sectors are very limited so prepare very well for those jobs.