Shopify App Developer Needed - Complete & Launch Production-Ready Shopify App
QR Centraal is a SaaS platform that enables businesses to generate smart QR codes, create mobile landing pages, manage digital menus, run campaigns, and track analytics - all in one place. We now want to extend our ecosystem by launching a public Shopify app that integrates seamlessly with our platform. What We’ve Built So Far- Basic Shopify app scaffold (details shared after NDA)- Partially completed OAuth and authentication flow- Early-stage UI integration with QR Centraal APIsScope of WorkYou will:- Review current code and architecture- Complete unfinished features and refine existing functionality- Improve integration with QR Centraal REST APIs (and Webhooks if needed)- Implement Shopify Billing API (subscription model)- Ensure app passes Shopify App Store approval requirements- Build production-grade error handling, security hardening & performance improvements- Set up automated deployment flow and best practices- Assist with final testing, bug fixing, and documentationIdeal Skills & ExperienceYou should have:- Proven experience building and launching public Shopify apps- Strong knowledge of Shopify ecosystem: OAuth, Admin API, Storefront API, Webhooks, Billing- Experience with React, Node.js/NestJS- Experience integrating third-party SaaS via secure API flows- Strong understanding of performance, security, and scalable architecture- Familiarity with App extensions, UI components (Polaris), and theme app extensions is a plus- Bonus: Experience with analytics tracking (PostHog, Segment, etc.)Deliverables- Fully functional Shopify app ready for App Store publishing- Technical documentation for future maintenance- Deployment scripts & CI/CD setup- Passing QA checklist + Shopify approval Apply tot his job