Android app debuging

Hi. We are looking for an Android app expert. We have our app that has an issue and cannot save data. we use php and mysql to write data. Our app was working fine until our programmer did some changes and we never heard back from him. We can provide the source code and http files. Here is the issue: before we were able to write a few data fields from our app to our web server. We asked the same programmer to add a text field to be added, he changed it but never tested it. Ever since that change we did not hear from him. We need to solve this ASAP.