Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Whether the code etc. can be handed over to a third party or other developer, to re-do the code, depends upon who owns the code, or the licensing or copyright (if any) that applies to the code.
And the subsequent permissions that dictate limitations to re-use, handing over, etc. of the code.
What contract did you have with the current developer, as it applied to the code? any mention of ownership of the code, is most significant with regard to your question.
If you own the code and the resultant program from the code (i.e. if you own both the source code and the object code), then you have no difficulties, I don't think:
1. provide the code needed to the new developer/programmer,
2. make sure you keep the license (and ownership of) & to the result of the work by the new developer, and
3. appreciate the results.
If this answers your question fully, please rate my answer, so that this case may be closed. Thanks, ***** ***** luck.
The source code files from which the app was developed would be the ideal (minimum, the very least) needed.
What file extension or file type those are, depends upon how the app was developed, with what programming package, etc. (If it were developed with Java, they would be .java files, if it were developed with C++, they would [I think] be .c files more or less, and so forth. I don't think it was Java developed! it might be C++... but I just don't know. So, 'Source files for the app' is what you need to ask for.)