Bitrix and WordPress: Support for 2 sites

We need support for 2 sites for 1 company - they are on Bitrix and WordPress.
Ideally, this should be done by 1 person who owns both technologies.

The order is as follows:
1) Take a couple of tasks from the backlock
2) You value in hours and money
3) We make a Safe Trade, test
4) If everything is OK - then we work on the backlog further (there are now 80 hours, if by eye).