I hope I was able to help Sergey find answers to some of his questions.
I conducted an account audit and answered all the questions asked in as much detail as possible.
Overall, Sergey is a pleasant and tactful person in communication, I recommend him for collaboration.

The task had many possible factors. for 500 UAH. There was a lot more analysis than I planned over time and more time spent on communication much more than I put on that amount.

For my fault is that I conducted a basic analysis for this reason and named the problems I found, then I actually conducted some review on this topic and found even more reasons, but I really didn’t want to explain them deeply because. It took a lot of time and so when I had two possible options down before that.

Thank you to the customer that paid for, of course, although the task with the communication and did not work with us.