iOS Utility App Development

I need an experienced iOS app developer to create a utility app centered around task management and productivity tools.

Key requirements:
- Follow Apple's design guidelines
- Full source code submission upon completion
- Publish on my App Store developer account
- Free service for 1 year for bug fixes and functional errors

Ideal skills and experience:
- Proficiency in Swift and iOS development
- Experience with task management and productivity apps
- Strong understanding of Apple's design principles and guidelines
- Knowledge of App Store submission processes

Please also provide future update cost estimates.