iPhone Task Management App Development

I'm looking for an experienced iOS developer to build a utility task management app focused on collaboration.

Key Features:
- Task Reminders
- Collaboration Tools (primary focus)
- Progress Tracking

Ideal Skills and Experience:
- Proven iOS development experience
- Expertise in building collaboration features
- Familiarity with task management app functionalities
- Strong UI/UX design skills
- Ability to integrate notifications and tracking systems

Please include relevant portfolio work and a brief project plan.