Hello Friend,
I am the topmost freelancer in Opencart skill over freelancer.com, you can check our reviews/portfolio for our experience. I have quoted 500, it covers opencart store development and on going support for 3 months after website development. We can fix any issue occur if any issue occur within 3 months of the website development, we increase ongoing support after 3 months of support finish on further next quote.
Looking forward for your response.
Kind Regards,
Pankaj Modi