How do I deal with a developer who speaks in jargon I do not understand? — answered by Engineer Saeed Baatiah
Ask for one thing: "explain this by its effect on my business, not by its technology." A professional can turn "we will use server-side rendering" into "your pages will show up in Google and open faster on mobile." Someone who cannot translate into business impact usually does not understand your business well enough, or is using terminology to avoid a clear commitment. That test alone filters a lot in the first meeting.