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 existWhat’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 UIEverything 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 categoriesThe app must:– Enforce limits correctly– Prevent access when limits are reached– Reflect permissions clearly in the UI– Handle upgrades/downgrades cleanlyMandatory 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-levelTechnical expectationsYou 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 usersThe goal is a real product, not a prototype.Long-term collaborationI’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 finisherI also need:– A simple, clear explanation of how I can later add:– New sections– New themes– New categorieswithout breaking the systemDocumentation 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 approvalIf 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