SwiftUI iOS & Watch App -- 2

Looking for an experienced Swift / SwiftUI developer to build a focused native iOS app with a paired Apple Watch app.
The app is a session timer and logger for a specific sporting niche. Two simultaneous countdown timers, a tap counter, session metadata capture, history with iCloud sync. iPhone + standalone Apple Watch app, both built natively in SwiftUI.
A complete interactive HTML prototype already exists — every screen, transition, and state is fully designed and working. This is a translation-to-native job, not a design job. The full prototype and detailed written brief will be shared with shortlisted candidates only.
Scope summary:

Native iPhone app in Swift / SwiftUI
Standalone watchOS app (must work without phone in range)
Reliable background timers with notifications (HKWorkoutSession or BackgroundTasks)
WeatherKit integration for auto-fetched conditions
CloudKit sync for session history across devices
Distinct haptic and audio alarm patterns
iOS 17+ support

Project terms — Partnership. I have the idea and a full sandbox html file which i think we can market within the fishing industry in the UK.

To bid for the partnership, your proposal must include:

Links to at least two iOS apps you've shipped to the App Store (watchOS experience strongly preferred)
One paragraph on how you'd handle reliable background timers on iOS — this is the hardest technical challenge in the project
Milestone-by-milestone price breakdown in GBP
Realistic week-by-week timeline

Please note this is a partnership option not a paid option. Please only bid if you would like to explore this opportunity further.