Hire a lawyer, file IP for your code and invention, backdate it to the time you started and show the logs of your Git account as evidence. Write the other comp

Hire a lawyer, file IP for your code and invention, backdate it to the time you started and show the logs of your Git account as evidence. Write the other company a C&D letter, that references you IP. You need two things when you first start out a lawyer to file IP and an accountant to figure out your money flow and forms.