I don't care how bad your imposter syndrome is - you deserve every dollar you can get from capitalists. Negotiate as much money as you can. Demand raises. If you can find some other corp offering more, go there. It doesn't matter if you think you deserve it, it's about extracting wealth from corps. Even if it turns out you're keeping a seat warm for 6 figures. Keep that seat warm and cash those paychecks. (Then donate as much as you can afford to).