Singapore Web development for online Checkout, Payment, Customer Login portal

We have an ongoing development of an Online Quote System for 3D CAD file. Where users can get an instant quote on our website after uploading a 3D CAD file in the specified file type. Currently we have completed the uploading, analysing and retrieving of pricing information with the utilisation of API that will be provided by our end. The entire development is currently based on firebase by Google We are currently looking for a committed developer to assist us with completing the remaining component: 1) Detect Country of User based on IP address and render options such as (currency, item options) 2) Discount Code 3) Connecting Shipping API to calculate shipping price (will be provided by us) 4) Standard Ecommerce Checkout, Payment integration (Stripe, PayPal) 5) Standard Customer Login Portal to view Order History, Uploaded Files, Edit Billing Information 6) Beautify entire website based on our provided appearance and theme. 7) Admin will have a basic CMS control to retrieve and edit users information Developer has to be comfortable working with firebase by google, javascript, database, APIs Developer are expected to be responsive and responsible in handling the project in a timely fashion. More information can be provided upon request