Mobile App for an Existing Ecommerce Website

I need an experience mobile app developer to develop a mobile app version of my ecommerce website built with php CodeIgniter. There is not existing endpoint api for mobile on the web version so that needs to be built.

I need only experience developers who have experience building ecommerce apps to bid on this project.

Please I need Timeline. Procedure, Costing (Fixed)

Please quote "experience mobile app dev" so i know you actually read this brief.

Once again, I have an existing functioning ecommerce multi vendor website running. I need a mobile application built for this.