Senior Full-Stack Developer for Lean Rewards PWA

Overview: We are looking for an experienced Full-Stack Developer to build a clean, lightning-fast Progressive Web App (PWA) for a modern rewards and sweepstakes club. The core mechanic is simple: users access our PWA, click on partner store links (Target, Walmart, Nike), and our system uses Impact Radius webhooks to automatically credit them with "digital tickets" based on their purchases. Core Features Required: PWA Setup: Mobile-first, responsive, and installable on iOS/Android via browser. User Authentication: Secure login/signup system. Affiliate Integration: Webhooks integration with Impact Radius API to track user purchases and update their digital ticket balance in real-time. Subscription System: Stripe integration for our premium monthly membership (tier-based ticket multipliers). Clean UI: Implementation of a high-end, minimalist design (we will provide the exact UI/UX flow and visual assets). NO in-app e-commerce store needed. Milestone Breakdown (Fixed Price): Milestone 1: Architecture setup, User Auth, and database structure. Milestone 2: Front-end implementation (pixel-perfect based on our design). Milestone 3: Core integrations (Impact Radius Webhooks + Stripe Subscriptions) and final testing. Requirements: Please start your proposal with the word "VIBE" so I know you read this. Share 2-3 links to PWAs or web apps you have built from scratch.