React Native engineer specializing in non-custodial multi-chain wallet development. Previously at Moonstake — one of Asia's leading non-custodial wallets — where I was responsible for integrating new blockchain networks. Shipped support for 50+ chains including Bitcoin, Ethereum, Solana, Cosmos, Polkadot, TON, Aptos, Avalanche, and many more. Each integration handled address derivation, transaction signing, and broadcasting natively. I also built a personal production wallet app supporting 9+ EVM networks, native Bitcoin (UTXO/SegWit), WalletConnect v2, DApp browser with injected Web3 provider, and NFT support. All cryptography on-device — no backend, no custodian. Available for remote contract or full-time roles. Async collaboration preferred. Can start immediately.