I have 5 years experiences work with OSCommerce/Zencart/Creloader/Max opensource. I have done 100s OSCommerce works like OSC customization, implementation, new mods, contributions,..
I can complete very complex OSC/CRE/Zencart features or Ecommerce solution.
I'm realy familary with payment systems intergating too like Paypal Pro, Athorize, Storm Pay, Egold, MoneyBookers,...