First of all, there is nothing special about being a (co-)founder. The only essential difference between a founder and an employee is that the former are willing to forego solid salary and accept extra levels of work and stress in the hopes that they will make up for it down the line in a much bigger payout. For a success of a company it is important which people perform various roles, and not how they're paid for it.

Therefore, the way to be "found" as a co-founder (technical or not) is in fact all about finding the right product you are willing to be a co-founder for, rather than "just" an employee. This is crucial, because if you don't truly believe in the product it will simply not be worth the effort.