Modify back end/.apk [no source code]

Dear Prospect Hiring Manager. Thank you for giving me a chance to bid on your project. i am a serious bidder here and i have already worked on a similar project before and can deliver as u have mentioned I have checked your requirements.i have right skills to work on this assignment my award = superb result = happy client. In a good partnership, good results happen. Good cooking makes good eating!BWe consider our client as our partner. can u provide your email or sky-pe etc for further discussion about the project. I am ready to discuss with you with best Regards