Perfex CRM Custom Modules - PHP CodeIgniter

I am looking to have a few different custom module projects built for my Perfex CRM application. The modules I need creating are complex custom ones and integrations. I have a detailed list of specific requirements and features that I would like to add to these modules and some I am looking for advice and guidance - so someone with previous experience developing custom perfex CRM modules and portfolio of some examples they can share would be ideal. My timeline for this project is moderate; I am expecting to receive the completed project within 3-4 weeks.