I need an experienced Flutter developer who can jump into my existing codebase and keep iterating with me long-term. The immediate focus is adding Apple’s auto-renewable subscription flow—purchase, restore, and server receipt validation—using StoreKit2 so it passes App Store review without hiccups. Once that piece works, you’ll guide the entire setup inside App Store Connect: bundle IDs, certificates, provisioning profiles, TestFlight build, and the first live submission. While we’re at it, I also want to flesh out three supporting modules that the product roadmap depends on: in-app purchases (consumable/non-consumable), push notifications via APNs, and a lightweight user-authentication layer (email/password or Sign in with Apple). This is not a one-off gig; I’ll keep extending the contract as features ship and quality stays high. We’ll collaborate through GitHub, exchange small pull requests, and hop on quick calls when needed. Acceptance criteria • Auto-renewable subscription purchase, restore, cancellation, and server validation working on-device and in sandbox • App uploaded, visible in App Store Connect, and approved for TestFlight • In-app purchase catalog loads and test purchases succeed • Push notifications arrive in foreground and background reliably • Authentication flow persists sessions securely across relaunch Please apply only if you have both a MacBook and an iPhone for local testing. Let me know which iOS versions you target most often and share a recent project where you handled subscriptions or similar modules.