Sports Club Management App Programmer

I'm looking for an experienced application programmer to develop and publish a cross-platform sports club management application, compatible with both iOS and Android. Core Functionalities: - Member Management: The app should efficiently handle all aspects of member tracking and management. - Event Scheduling: A user-friendly interface for scheduling club events. - Payment Processing: Secure and reliable methods for handling club fees and other payments. - Subscriber Card: A system for managing and validating subscriber cards. - Income Calculation: Automatically calculate income and required amounts. - Administrative Account: A dedicated account for administrators with enhanced privileges. - Work Team: A function for managing and coordinating the work team. User Roles: - Members: The general user base of the app. - Administrators: Users with the highest level of control and oversight. - Coaches: Users with privileges to manage and monitor training sessions and events. Ideal candidates should have: - Proven experience in application programming, particularly for iOS and Android. - A portfolio demonstrating previous work on similar projects. - Knowledge of secure payment processing systems. - Understanding of user role management within applications. Please provide examples of your previous work in your proposal.