Crypto wallet
A consumer crypto wallet for iOS and Android: balances, swaps, cross-network transfers, earning features. The project is under NDA, so there is no name and no exact numbers here.
what I did
- The mobile app (React Native, Expo) with passkey and biometric unlock
- The API (Express, PostgreSQL, Redis) with background job queues and monitoring
- Cross-network transfer integrations
- Smart contracts (Solidity) with tests; CI/CD and over-the-air updates via Expo
a technical detail
Webhook signatures are verified against the raw request body, not against JSON that has been parsed and re-serialized. The body is captured before the JSON middleware, because after a round-trip the bytes no longer match what was signed.
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