Opencart Automotive shop with tecdoc needs support

I am looking for a freelancer to support our automotive shop with an existing design that has opencart support, but and tecdoc API integration. My existing design will be used and I need someone who has sufficient experience in opencart to help me set up new features and generally support. This will include and providing customer support for any technical issues that may arise. I need someone who is knowledgeable in this area and can understand my requirements quickly and accurately. I look forward to finding the right freelancer for this job. the shop has been made by an agency but we like to change to handle more professionally and with fast reaction.