People who are deep in their own field, not in software. Each of these answers the same three questions: what the problem was, how the work went, and what was left standing at the end.
Thirty minutes, free, and not a sales call. Tell me what you are trying to build and what you already have. If I do not think this is a fit, I will tell you that too.
Pricing depends on scope, so there is no figure on this site — we work it out once we both know what the work is.
Write to meEnglish or Turkish — either is fine.