Audio Streaming App Development

I'm looking for an experienced mobile app developer to create an audio streaming app similar to Spotify for both Android and iOS platforms.

Key Features:
- Audio Upload: Admin functionality to upload audio files.
- Third-Party Login: Google, Facebook, Apple.
- Bookmarking: Resume playback from the exact spot.
- Security: Encrypted audio files with DRM.
- Subscription Module: Monthly and yearly options.
- Payment Integration: Credit/Debit Cards, PayPal, Bank Transfer, Google Pay, Apple Pay, Stripe.

Ideal Skills and Experience:
- Proven experience in developing secure streaming apps.
- Strong knowledge of DRM and audio encryption.
- Expertise in integrating multiple payment gateways.
- Familiarity with third-party login systems.

Please provide a portfolio with relevant work.