The most important advice is: let them talk first.
There are two cases:
1) You'll get more than you expected. Good for you.
2) You'll get an offer for less than your expectation. You'll see how much your work is worth for the company. Maybe it's time to submit your CV elsewhere.
[1] https://www.kernel.org/doc/html/v6.9/networking/af_xdp.html