Thank you for doing this! I'm working at a tech startup on my F1-OPT (expired July 15). My lawyer submitted my H1B petition one month ago but we haven't received the receipt from USCIS. Can I continue working while waiting for the receipt and the approval? If not, what are some options to legally working until we get the receipt?

Yes, you can continue to work based on something called cap gap coverage but you should get a new I-20 issued by your school.