Help in planning to switch

Hi,

I have 4 years of experience as a Java developer in TCS.

I want to switch to financial services/banks like JPMorgan Chase, Morgan Stanley, Goldman Sachs, Barclays, Citi, HSBC

Can anyone who recently switched to these companies or knows about the recruitment process help me?

I want to know the application process like how many rounds and what are those rounds?

If coding questions asked what is the level?

And lastly how much time will it take to prepare, assuming I'm a novice in DSA, LLD, HLD.

Thanks in Advance.