There are many jobs available in government sector after Diploma in Computer Engineering.
There are many companies where you can apply for job in government sector, check the list below
Vizag Steel (RINL-VSP)
NTPC Limited
TNPL (Tamil Nadu)
National Fertilizers Limited (NFL)
IOCL
MRPL
Kolkata Municipal Corporation
Power Grid Corporation of India Limited
HSSC (Haryana)
IOCL
SJVN Limited
CGEWHO
IRCON
Ministry of Textiles
HEC Limited
MPPGCL
SVNIRTAR
IISER Bhopal
Garden Reach Shipbuilders and Engineers Limited (GRSE)
Kolkata Port Trust
CPP-IPR
Indian Coast Guard
The companies release their own vacancy notifications. You have to search for them and you can apply accordingly.