Full-Stack Developer needed for Loyalty Card SaaS Platform (Apple Wallet & Google Wallet)

I’m building a SaaS platform that allows merchants (restaurants, cafés, hair salons, shops) to offer digital loyalty cards directly in their customers’ Apple Wallet and Google Wallet — no app to download. The platform includes 4 parts: • A dynamic public page where customers register and add the loyalty card to their phone • A merchant dashboard (panel) to manage customers, scan QR codes, add points, create offers, and send push notifications • An admin back-office to manage merchant accounts • Integration with PassKit API (passkit.com) for all Apple Wallet & Google Wallet card generation, updates, and push notifications Key features: • QR code scanning via browser (no native app needed) • Real-time card update after each scan • Points calculation based on purchase amount (configurable) • Push notifications sent directly to customers’ lock screens via PassKit • Dynamic branding per merchant (logo, colors, welcome message) Tech stack (recommended): • Backend: Node.js or Python • Database: PostgreSQL • Frontend: React.js or Vue.js • Wallet integration: PassKit REST API • QR scan: html5-qrcode or zxing • Hosting: Render or Railway What I will provide: • Complete specifications document (already written) • A working React prototype of the merchant dashboard • PassKit account (already created) What I’m looking for: • A developer with experience in REST API integrations • Experience with Apple Wallet or Google Wallet is a strong plus • Clean, documented code pushed to a private GitHub repo • Realistic timeline and clear milestones Please include in your proposal: • Examples of similar projects you have built • Your estimated timeline • Your fixed price quote Looking forward to working with you!