Cross-Platform Ticketing App Development

I need a mobile app developed for both iOS and Android platforms. The app will focus on external ticket purchasing and integrating with users' calendars.

Key Features:
- External Ticket Purchasing: Users can buy tickets directly through the app.
- Multi-Login Options: Users can log in via email/password, social media, or phone number verification.
- Calendar Integration: Link purchased tickets with calendars for event reminders.

Ideal Skills and Experience:
- Proficiency in mobile app development for both iOS and Android.
- Experience with secure login mechanisms and calendar integrations.
- Strong UI/UX design skills to ensure a user-friendly experience.
- Background in handling external APIs for ticket purchasing.
_ light and fast responsive
easy adaptable with white lable change for color logo and banners and change links
Buy Ticket goes to external mobile responsive site
Login Ticketing platform account external responsive site
this is a sample buying site https://dfptickets.sales.ticketsearch.com/sales/sales
this is customer login site: https://dfptickets.sales.ticketsearch.com/register
returning customer login https://dfptickets.sales.ticketsearch.com/login
customer should be able to open their email and store a pdf ticket to their wallet as we provide pdf etickets
also want customers to have a map with find venue googl map and waze

Please provide samples of similar work.