Shopify App Embedding & Deployment Expert Needed

I have a custom Shopify app that is built but NOT embedding correctly in Shopify Admin.
Right now it behaves like a standalone website, not a native Shopify embedded app.

I need an experienced Shopify App Bridge developer to:

Fix Shopify embedded app behavior

Correct App Bridge / iframe / host issues

Deploy the app to Vercel (preferred)

Configure production environment variables

Update Shopify Partner Dashboard settings

Test OAuth + embedded flow

Submit the app to the Shopify App Store

This requires debugging + configuration, not a fresh build.

Tech Stack

React (Vite)

Node.js

PostgreSQL

Shopify App Bridge + OAuth

Hosting: Vercel

Requirements

Must have:

Shopify embedded app experience

App Bridge debugging experience

OAuth & iframe/CSP knowledge

App Store submission experience

Do NOT apply if:

You’ve only built Shopify stores

You’ve never fixed App Bridge issues

Deliverables

App embeds correctly inside Shopify Admin

OAuth works in production

App deployed to production

App submitted for App Store review

Timeline

Start immediately