Duty Tax API Integration - WP Custom Module

HI, I have a wordpress site and need to calculate duty tax on a per country basis, I will need a really experienced programmer to help. I know basic HTML and PHP, I am close, just need some help for about 10 hours or so, if it takes longer I will pay more. Need programmer who has done import duty tax API integration with WooCommerce previously, it's a custom module so must be experienced with custom module WC dev.