Mobile Crypto Wallet & POS Development

I need a complete, production-ready mobile application (iOS and Android) that lets users hold Rupiah-based crypto assets, send and receive them seamlessly, and review a clear, immutable transaction history. From the same code-base I also want a built-in swap engine so users can exchange their Rupiah token for other coins, plus a lightweight point-of-sale module that merchants can run on a tablet or phone to accept the same assets at checkout.

Security comes first, so please apply best-practice key management (encrypted local keystore, biometric unlock, optional hardware-wallet pairing) and audited open-source libraries wherever they fit. A crisp Flutter or React Native front-end is fine as long as the results feel native; Kotlin/Swift twins are welcome if you prefer.

Because the supported asset is a Rupiah token rather than a mainstream chain coin, the backend must expose any custom RPC endpoints or bridges needed for balance look-ups, fee estimation and on-chain broadcasting. I am ready to supply node access and technical docs for the token contract once we agree on the architecture.

Deliverables I will review before sign-off:
• iOS & Android builds (TestFlight / APK) with send-receive, multi-asset store and full history views working end-to-end
• On-device swap flow that executes and settles on-chain, returning final TxID
• Merchant POS screen that generates dynamic invoices (QR / NFC) and records payment status in real time
• Clean, commented source code plus build instructions
• API or SDK documentation for any server-side components and a brief security report outlining the measures implemented

If you already have experience with custodial-optional wallets, Solidity/BEP-20 bridges, or retail crypto POS systems, that will save us both time. Please outline the stack you intend to use, reference at least one live wallet you have shipped, and give me a realistic timeline from kickoff to store submission.