Find problems and fix errors in the cast-of-way development of Bitrix24

We are looking for a PHP programmer specializing in Bitrix 24.
As part of a large project to implement Bitrix24, specialized functionality was implemented. You need to deal with custom functionality, find errors in the code and fix.
Preliminary, the work on the task will take 10-20 hours. If youre ready to take on it, write.