This is a very important question and you need to be prepared to answer the question.
Because quoting too high or too low will not be feasible. Because, the company has a budget allocated for that position and they will be ready to give your expected salary.
You can ask below points:
- As what the company is paying for the position.
- Ask that you need 20% higher than what you are getting now.
- Else you can say, I need X salary considering how cutting edge the technology is.
It is always good to ask their offering first, later you can say your expectation.