iOS Productivity App Development

I'm looking for an experienced mobile app developer to create a productivity tool for iOS.

Key Requirements:
- Design and develop a user-friendly productivity app.
- Ensure smooth performance and intuitive navigation.
- Experience in iOS app development is a must.
- Familiarity with productivity app features and UX/UI design.

Ideal Skills:
- Proficiency in Swift and iOS SDKs.
- Strong background in mobile app development.
- UX/UI design experience.
- Ability to integrate with other services and APIs.

Please provide examples of similar work and a detailed estimate.