I had posted this on an earlier post in Salary discussions. Hope it helps.
Never ever reveal your salary at the start of these interviews. If they ask for it, just say my expected salary is in this range.
If it's out of budget, they won't get back to you. And you would have saved your time as well.
Once they proceed with the interviews, you also need to understand how ur interview is going. Do you have any leverage (on target experience, specialization, early availability, their need etc)
Once you understand your leverage, you can use that to justify your ask.
Don't be afraid to ask, if you don't, you will mostly undercut yourself.
But while asking, don't be arrogant. Be polite and respectful, say you want total comp to be this, which can be split as fixed + variable + joining bonus. And you need X amount of RSU/ESOPs etc. Justify your ask.
It they really like you and want you, they will come back with a reasonable offer