I need a Expert Moodle Administrator and Developer

Hello All,
I need a developer or administrator to manage all these tasks for me. my current moodle site is lms.hurak.co.uk

1. Upgrade to the latest version of Moodle
Our Current moodle version is 3.11.5 we need to upgrade to 4.1.1+

2. Ensure APIs are still working
We have made some custom APIs in moodle which are working fine with our Laravel Application. But whenever we upgrade moodle from 3.11.5 to 4.1.1+ the APIs functionality has stopped working. We need someone to upgrade our moodle as well as make sure our all APIs will work.

3. Customisation to Moodle to make it like our theme.
Once you upgrade moodle to 4.1.1+ we need some customization as well in the design to look like our current theme.

4. Duplicate the ELN course on our Moodle
we need some widgets like a calendar and message window on the learner's panel so that learners directly contact their instructor.

5. Create a video and provide training to our developer.