Dear aspirant hope you are doing well..

The government owned corporations are termed as Public sector Undertakings (PSUs) in India. In a PSU majority (51% or more) of the paid share capital is held by central government or by any state government or partly by the central government and partly by one or more state governments..

Yes you can Join the PSU after qualifying the GATE exam after completing B. Tech course in computer science...

Hope it's helpful thank you..