iOS App with Authentication

I need a native iOS application built from the ground up, targeted at the latest public release of iOS. The first, non-negotiable requirement is a rock-solid user authentication flow—sign-up, sign-in, secure session management, and a straightforward way for users to reset credentials. I’m open to whether you use Firebase Auth, AWS Cognito, or a custom JWT-based backend, as long as the solution is swift, secure, and well-documented for future scaling.

Beyond authentication, the broader feature set and UI will be refined together once the core login flow is in place, so clean, modular code that can be extended is essential. If you have experience layering in extras such as push notifications or in-app purchases, mention it; those may become phase-two add-ons.

The deliverable for this phase is an Xcode project (Swift or SwiftUI) that compiles without warnings, a TestFlight-ready build, and brief setup documentation so another developer can pull the repo, run `pod install` or `swift package resolve`, and launch the app within minutes. A short video walkthrough of the login process will serve as final acceptance proof.

Please share one or two past iOS projects that highlight your authentication work, note the tech stack you prefer, and outline an estimated timeline for getting a beta into TestFlight.