All Gormint websites are hosted in datacenters managed by NIC.
Most central gormint websites are developed by NIC
NIC is Gormint's in house IT wala PSU.
Information about description | National Informatics Centre
www.nic.in
I am no expert in IT infrastructure by it probably is the virtualization tech and the scale of something like AWS.
OpenStack is a starting point, but they will have to customize it for their needs.
You can't beat AWS btw, the goal should be for something like Koo to serve it's own needs first, then make it a public "cloud vendor" like how AWS is.
Basically they need competent people, the hardware itself, and the infrastructure like 24x7 guaranteed powersupply, the land and building for the datacenter, etc.
All of which needs money.
Lots of money.
And time.