Hey, * I am sorry to hear that your current developer has left but I Assure you this will not happen with us*
I have reviewed your referral link and understood that you wish to do some updating and customisation to your website and I have got experience with these and have 7+ years of experience in PHP/MySQL based Web Designing and Development including CMS coding conventions and configurations.
For sure, I will provide you accurate time cost but before that could you please confirm me what changes and updation you wish to do on your website?
Please, check my PrestaShop work:-
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My experience with PrestaShop and OpenCart
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--- Installation and configuration PrestaShop/OpenCart development like custom development, creating e-commerce stores, Blogs, Forums, etc.
--- Create/modify custom templates, responsive themes; install/configure premium templates as per specifications
--- Integrate Payment Gateways
--- Custom modules/extensions development/modification and installation
--- Product categories, Sub categories, Filters, Sorting, and Quick search, user logins, etc.
--- Also, I'm well versed with MutiStore functionality and can configure and customize it
Please do let me know If you have any query or when you are available for further discussion
Waiting for your Response!
Warm Regards
Naren