Hello,
I've read your requirements carefully and I can assure you, no matter what problem is, it will be done in the best quality, ASAP.
I work with a team consist of 4 freelancers, not only we have Python expert, but also we have skilled C/C++, Java, Kotlin, Javascript, and Swift developers in our team. We give our clients, 2-month support and and 4 updates in case there was any issues or bugs left in the source code. Since we use Test Driven Development (The project/app ,in your case the problem, is tested in multiple levels for bugs and errors) there was no bug found.
Can I know more about your application and the niche you are working on? Do you have any document mentioning project requirements? Let's discuss about your project and see how much time and budget it needs.
Best Regards,
Parsa