OpenCart Extension Customisation

Hello people, i need an expert and high skills developer to customize an extension on my OpenCart new ecommerce site. This is my ALREADY INSTALLED extension : [login to view URL] These are my CUSTOMISATION REQUIREMENTS : 1) Fix categories (all categories must display all sub-categories products) 2) Fix breadcumbs and navigation 3) Fix product links on pages with one or more filters applied 4) Fix bug on special characters of SEO links 5) Apply desired site design on categories navigation pages It's important to find a fast,accurate and professional developer : PROJECT DEADLINE MUST BE RESPECTED, ALL TASKS MUST BE FULLY COMPLETED,ALL FOUND BUGS SOLVED AND EXTRA FUNDS REQUESTS ARE NOT ALLOWED. I'm fully at your disposal for any kind of information. PLEASE READ CAREFULLY ALL REQUESTS AND POST YOUR BID ONLY IF YOU ARE ABLE TO MANAGE AND COMPLETE THE PROJECT. ALL PROJECT WILL BE DEVELOPED DIRECTLY ON MY SERVER. Payment details : 50% milestone at project start + 50% milestone when at least 50% of tasks will be successfully ended. Milestone release will be completed ONLY when you will get my complete satisfaction.