Secure Web-Based Crypto Cold Wallet Development

I need an experienced developer to create a secure, web-based cold wallet for Bitcoin, Ethereum, and Litecoin.

Key Features:
- Secure storage with industry-leading crypto security practices
- Multi-signature support for enhanced protection
- Backup & restore functionality to safeguard user assets
- Admin panel with password-protected access to view all fiat transactions
- KYC integration (transaction limits not required after verification)
- No deposit fees (only withdrawal fee + network fee applicable)
- Automatic fiat-to-Tether conversion for bank transfer deposits

Ideal Skills & Experience:
- Proven expertise in cryptocurrency security
- Experience in developing secure web applications
- Strong knowledge of multi-signature wallet functionality
- Background in backup and recovery systems
- Experience with payment/crypto integrations

Please share your portfolio and examples of similar crypto wallet or fintech projects you have delivered.