Be very careful with this. Web dev companies are NOT playing with house money. Everything they don't spend on you, they get to keep. They tend to be the most

Be very careful with this. Web dev companies are NOT playing with house money. Everything they don't spend on you, they get to keep. They tend to be the most likely to argue billables at the minute level, and they always want concessions (like a lower rate or some free time). In my experience it's a false economy.