Hello there ,
We already develop sales application as per your requirement .I have an 9 year+ experience in designs well as development.
I've sound knowledge of languages PHP7, HTML, CSS, Bootstrap, Angular JS, Node.js, React.js, MongoDB, Mysqli, CI (CodeIgniter), Wordpress, Shopify, Opencart, Wix, Android & IOS, Photoshop and more and have developed numerous of sites and modules using this.
Waiting for your positive response.
Thank you