They had net 30 terms on the contract and I didn’t think anything of it. That meant I didn’t find out until six weeks after when they missed a payment and then shortly after that shut down the company.

Obviously I won’t agree to net 30 again.

Net 30 is just the way contractors are paid in the US. It's rare that a company can/will agree to something different, especially if there are multiple contractors bidding on the job.

Not saying it's impossible, just that it will cut down on your potential clients.