Developer/CRM/Email Service To our Existing Ecommercce

We are diet supplements company that deals sells online in Thailand. We have 2 sites developped that uses Lime Light CRM and are looking to integrate Maropost Email provider. Right now so do we have small adjustments to make on our existing sites and also looking to make integrations with tracking services and will be looking to run split tests on price and different kind of up sells. Looking for a part time developer to start with and if it works well a few months down the line so will it be full time as we are growing each month. Perfect communication in English is a MUST HAVE. References of old employes will be taken seriously and looked into.