How to formulate requirements for the qualification of a developer?

Question

Startups

Introductory: I have an idea for a startup. There is an investor. No IT knowledge. None, from the word in general.
Task: We need to find a developer who can estimate the cost of the project.
Question: How to understand if you need a person in front of you, if everything he says about himself is a set of incomprehensible terms?)

Answer 1

How to do it in theory - you have already been written
In practice, you cannot make a startup in an area where you do not have expertise
Make a startup without focusing on IT and learn the basics

Answer 2

There is only one indicator - such a person can speak the language of business and has launched projects behind him.
The technology stack is secondary.

Answer 3

It is not in vain that they receive money from a specialized recruitment agency

Answer 4

There should always be a specialist who can evaluate the candidate from the technical side and there should always be a specialist who should evaluate the person socially.
One without the other can go like this: "A good specialist, but a moral freak who will not take root in the team" or "an excellent employee in social terms, but a bad IT specialist who just brazenly lied to you, but you didn’t understand anything."
- I understand that I want to eat a fish and .... sit down. But it can usually cost you more in the long run. Therefore, as already mentioned above - a personnel agency. Or dance with tambourines and look for acquaintances, acquaintances.

Answer 5

In general, it has been noticed that those who do not know how to express themselves (talks about themselves - a set of incomprehensible terms), like empty barrels - large and empty inside, you can safely send nafig such.
A lot of smart words - a screen behind which there is usually little to eat.
Those who have something in their heads can clearly explain what they do, what they offer, with a mindset and the establishment of a common language, everything will be fine and it will be easier to do some common things.
And the empty balls will continue to show-off, and not do the real thing.
And yes, recruiters who are closer to the topic will be able to weed out cutlets from flies faster.
// through friends the option is so-so.

Answer 6

Question: How to understand if you need a person in front of you, if everything he says about himself is a set of incomprehensible terms?)
Unfortunately, in reality, no. Just start to understand the area yourself. But here lies the Dunning-Kruger effect .
So the only working option is to find a person whom you trust for one reason or another (an acquaintance, an authoritative famous person, a well-known company). But the risk always remains.
As yurygolikov correctly said, first you need to write a technical specification. Doing it right on your own without experience is unrealistic, so you need a business analyst to write technical specifications (and this work costs money). An experienced analyst can say the order of cost with a spread of several times even without a detailed technical specification.
At the same time, everything is complicated by the fact that there is really no objective cost, different developers will take different money.
For example, developers with a good reputation will charge more (sometimes at times), but with them the risks of failing the project are less. A freelancer from the outback will agree to do something for a bowl of rice, but the risk that he will do nothing, do it with terrible quality (or simply can’t do it better) or simply disappear halfway through is much higher.
So it’s better to decide right away - you 1) reliable, high-quality, qualified and expensive, or 2) risky, bad and cheap.