I know a student in our neighbourhood (not desi) who completed undergrad in UC berkeley and got a job in amazon as data engineer. I also see many students back in hyd from decent colleges like griet/vnr/cbit etc also joining amazon. so what is the difference? 

Can you post the position details for both UCBerkley guy and Desi guy? 

CS degree is one of the degree where the school/college does not matter. For your first job, all you need is:

Object Oriented Programming 
Data Structures & Algorithms
System Design

After the first job, your experience matters rather than where you received your degree. 

In US university does not matter after first job. It’s mostly talent and skills that takes you higher position. However degree and university matters for C level posts. 
In India, Foreign degrees can fetch you higher positions right away. 
Kids these days are studying under grad in US coz they have means (money) and US is still a craze. University is a big brand name. 

2 minutes ago, Konebhar6 said:

In US university does not matter after first job. It’s mostly talent and skills that takes you higher position. However degree and university matters for C level posts. 
In India, Foreign degrees can fetch you higher positions right away. 
Kids these days are studying under grad in US coz they have means (money) and US is still a craze. University is a big brand name. 

No they don't ,unless it's some reputed college .

It's just for the experience of living in u.s.