Selling to any real enterprise that costs north of 100K is almost impossible without a sales team (account executives, sales engineers). A lot of account executives have relationships from their previous work and they get a meeting through that. Look at any successful B2B startup like Okta, Mulesoft, Servicenow and their sec filings. Sales spending is always higher than R&D. It’s also assuming that your software is bug free and software engineers can spend time doing poc, demos etc or they like doing that. As much as we can all hate enterprise sales, just getting a contract from a large fortune company is a big deal.