Bitrix24 (Box) - to refine the script for the service station. PHP, JS

Hello, looking for a developer under Bitrix24 (Box).

You need the knowledge of Bitrix24, PHP, JS and everything that is necessary to implement the improvements.

TK is available, I will send it to the candidate.

Ten days.
Budget 20-35k (There are 2 options: refining our solution or developing with 0)