Gamified App for Teamwork Skills

I need a developer to create an engaging app that gamifies lessons focused on improving teamwork skills. The goal is to enhance the application of skills and achievement of tasks through interactive elements.

Key Requirements:
- Design collaborative tasks and group challenges
- Incorporate achievement tracking and skill application metrics
- Develop a user-friendly interface
- Ensure high engagement and knowledge retention
- Monetisation features/payment gateway
- Follow Agile methodology for iterative development
- Include gamification principles such as level-ups to promote stickiness and engagement

Ideal Skills and Experience:
- Experience in app development
- Background in educational technology
- Expertise in game design principles
- Strong UI/UX design skills