Custom Shopify App (Themes & Sections Library) – Production-Ready, App Store Compliant

I’m looking for an experienced Shopify app developer to help me take an existing Shopify app from “early foundation” to a fully production-ready, App Store-approved product. This is not a beginner project. I’m looking for someone who understands Shopify apps deeply, including theme injection, sections, billing, plans, and App Store requirements and dev. I already have the base: – App created and installed – Backend logic partially built – Connectivity set up (Gadget) – Some UI, tables, and flows already exist What’s missing is making everything solid, clean, bug-free, and scalable, so the app works exactly as intended and can be published publicly. What the app does (core functionality) The app is essentially a Themes & Sections Library for Shopify stores. After installing the app, a merchant should be able to: – Browse different libraries (Themes, Sections, Templates) – Install Shopify sections directly into their existing theme – Install full Shopify themes, which must: – Be injected automatically – Be published (or clearly selectable) – Reflect correctly inside the app UI Everything must stay in sync with the app state. Plans & permissions (very important) The app uses 3 subscription plans. – Starter (default / entry plan) – Can install 1 section – Can install 1 theme – Only from the Starter category – Higher plans unlock: – More sections – More themes – More categories The app must: – Enforce limits correctly – Prevent access when limits are reached – Reflect permissions clearly in the UI – Handle upgrades/downgrades cleanly Mandatory requirements (non-negotiable) – 100% Shopify App Store compliant – Proper Shopify Billing API usage – No broken installs, no half states – Seamless UX (no “nothing happens” actions) – Clean error handling and logging – Stable install / uninstall behavior – Works across multiple themes per store – Production-ready, not demo-level Technical expectations You should be comfortable with: – Shopify App architecture – Theme & section injection – Shopify Billing (subscriptions) – App permissions & scopes – Polaris / App UI logic – Backend logic that doesn’t break under real users The goal is a real product, not a prototype. Long-term collaboration I’m explicitly looking for: – Someone I can work with long-term – Ongoing improvements, new features, refinements – A developer who thinks like a product engineer, not just a task finisher I also need: – A simple, clear explanation of how I can later add: – New sections – New themes – New categories without breaking the system Documentation or a short walkthrough is enough — it just needs to be understandable. When applying, please include – Shopify apps you’ve built or worked on – Experience with theme/section injection – Whether you’ve published apps to the Shopify App Store – How you approach stability and App Store approval If you’re the right person, this won’t be a one-off job. I’m building a serious product and want someone who cares about quality. Apply tot his job