Is there any site on Stack exchange network that allows to ask for code (or reference to code) in a particular programming language for a given problem?
Stack Exchange sites are designed to create a collection of knowledge by helping users with very specific problem statements so other can solve those problems on their own.
Unfortunately, questions soliciting users to build something for me are not allowed on these sites. And posts sending users elsewhere for solutions are not considered an 'answer' in the context of a Stack Exchange site because posts are expected to contain complete solutions.
There are rare exceptions like "Puzzling" and "Code Review" where folks engage in exercises of solving problems and improving working code. But Stack Exchange is not meant solicit code or other work and should be 'flagged' if it occurs.