As you want to get the details of government jobs after B.Tech Computer Science so here is the information of the same for you:

Jobs in Government Sector:
The various job prospects for these professionals are

Domain Consultants
Industries Officer (Technical)
IT Manager
Jr. Software Developer
Software Engineer
System Engineers
Team Leads/ Architect
Technology Analyst

Central Government Jobs after B.Tech in Computer Science:
Some of the central government sectors where these professionals can find jobs are

Indian Railway under Signal Section
BSNL (Bharat Sanchar Nigam Limited)
ISRO (Indian Space Research Organization)
DRDO (Defense Research and Development Organization)
ECIL (Electronic Cooperation of India Limited)
AAI (Airport Authority of India)
SAIL (Steel Authority of India)
RRB (Railway Recruitment Board)
UPSC (Union Public Service Commission)
CDS (Combined Defense Service)

Jobs in Indian Railways after B.Tech in Computer Science:
The computer science graduates can perform in these fields as

Technical assistant
Computer operator