Looks buggy to me. I created a test invoice and specified that it should be payable at a later date and only via ACH.
I checked the preview link and the only option to pay was by credit card. I sent the invoice anyway and the test user's credit card was immediately charged.
I work with early stage companies, and those companies don't always exist a year. I've also worked with companies (for multiple years) that were bought & sold a few times, so two employment stints can easily look like five.
Not only would the ideal candidate have the above experience, they would also have to be able to pass whatever interview process they have lined up.
When a company wants such a broad skillset/range of experience, how would they interview for it?
Unrelated edit: I looked up the job post, and one of the listed benefits is "2 weeks paid vacation". Personally I would need more time off to decompress from constantly being pulled in different directions.
I would suggest finding a forum that your target audience visits. If they respond well to your idea they might just turn into your first few customers.
I hit a ceiling working remotely at a previous company. They flat out said they wouldn't advance me any further as the sole remote employee. I had 5 managers in 3 years in that same company—I think eventually everyone who knew my track record left the company, so there was no one in the office to vouch for me.