Blockchain dev with experience in NFTs

I'm seeking an experienced Backend blockchain developer to create a secure iOS and Android mobile wallet for cryptocurrency.

Key Features:
- Facilitate sending and receiving various cryptocurrencies
- Maintain a detailed transaction history
- Incorporate robust security features, including 2FA and biometric authentication

Ideal candidates will have a strong background in blockchain technology and mobile app development. Experience with implementing secure features and creating transaction histories in a mobile wallet is highly desirable. Please provide examples of similar projects you've completed in the past.