Need a proger for the site on Beatrix

We are looking for a partner to refine the site on bitrix: https://mimismart.ru/
It is necessary to correct the work of forms (now forms send data both to the strom and roistat, you need to only in the roistat)
We need to remove the preloader
We need to optimize download speeds
Analyze on errors (if there is - remove)

BUDGET UNDER DISCUSSION