Hello,
I have 8 years of experience with WHMCS. I have created many addon modules, provisioning modules and hooks script for whmcs.
I can do this for you. I have created similar script earlier. Please check my reviews. I mostly do WHMCS jobs only.
I write clean code, that is easy to read. I follow PSR coding practices. I mostly use inbuilt WHMCS dbal functions and localAPI, so the the module will be upgrade compatible with WHMCS as well as php versions.
Please let me know if the VPS creation scripts already exists. We can negotiate the price once the project description has been provided in full.
Regards