TLDR: is there a standard format that people use to define the application they want to build so companies can bid on it's implementation?

When a new person decides to farm out the work to one of the solutions companies that are part of this community, is there a standard specification document that a customer can author that allows solution architects to bid on the implementation?  Or is there another site that people solicit specialists to do the project?  I am sure that the types of customers range from a small retailer to a large company, with each solution provider geared to implement on either small, medium or large solutions.  But there is probably a cap on the "large" before a company just goes full oracle database or the like....

TBH, it would probably be an interesting airtable/filltable app to allow people to define their requirements. I wouldn't be surprised if one is out there and I'm just not aware of it. 🙂

Thanks.

Jeff