Bugfix with Javascript and J query

I am looking for a freelancer to fix a specific functionality issue with my JavaScript and jQuery code. The code is not working correctly and I need someone to address this issue. Once I launch the server it doesn't react as it should because it doesn't retrieve the information from the endpoint propertly. Given that the problem could be placed between front and back maybe a full-stack developer is preferred.

Spanish speaking is a plus

I can provide full access to the existing code and documentation for the project.