Joomla Custom Extension Developer

I am running software development company https://www.wdmtech.com in Noida (INDIA). We are looking for long term Joomla developer for below tasks...

1- Joomla Extensions development.
2- Joomla existing Extensions Customization.
3- Joomla websites upgrade 3.x to 4.x.
4. Joomla Template Development.

Thanks,
WDMtech - Danish Babu