Percentage of stock options in a startup?

I am in the process of job hunting and just interviewed at a startup in the medical device field which is currently just a group of 3.

They have already started and sold a company to one, if not the biggest medical device manufacturer in the US.

I would be coming in as a Sr. R&D engineer and was wondering what I should expect in terms of compensation through stock options. The salary itself would be competitive, not sure about any other compensation though. Granted no idea if I will get the job, but I have never been in a position like this so I want to be informed and do plan to work in startups.

Any advice would be appreciated!

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