Small Fixes on my existing windows app -- 2

We require a skilled developer who has thorough knowledge of MS visual Basic 2015 and is well experienced in open cart 1.5.6.4 and for future versions and All other aspects of opencart - no surprises at the end of the project that you did not know about this etc etc. Developer should be able to advise if there is anything lacking that we haven't mentioned. Need a developer to look at an app built by a time waster (developer) and correct his work and glitches such as database connection issues - responsiveness of the app to work with opencart online server database and to make the app more useable for us. We need our issues fixed within 7 days. Please do no bid just for the sake of getting this project - If you haven't got the skills and in turn waste our time - you will be reported to customer services.