Business Management Mobile App Development -- 2

I need a mobile app to manage business tasks and information. The app will primarily serve customers, clients, managers, and business owners.

Key functionalities include:
- Tracking jobs, tasks, or projects
- Managing customers, bookings, or appointments

Ideal skills and experience:
- Mobile app development expertise
- Experience with task and project management features
- Proficiency in customer management systems integration
- UI/UX design for a user-friendly experience
- Knowledge of security protocols to protect business data

Please provide a portfolio with similar projects.