I have made numerous project with Atmel AVRs during the last 15 years.
Please note, that your project description implies anything between 1 and several hundred hours of work, in order to make a serious bid I would have to know much more.
Considering a tiny24 the program can not be that big but it might still be quit complex - on the other hand you might be an excellent programmer with well documented source code or (no offense) really hopeless and thinking comments are a waist of time - I have no way of knowing as you have no way of knowing whether or not I'm up to it.
I suggest you contact me so that we can work out a basis for cooperation in finishing your project.