Expengo Wallet
Fluid, offline-first personal financial telemetry with sub-millisecond SQLite indexing.
Expengo is an offline-first personal financial tracker built for speed. When a user buys a coffee or pays a toll, they can log the transaction in under 2 seconds, even underground in a subway with zero cellular reception.
Most banking and budgeting apps force users to wait on spinners while communicating with distant cloud APIs. A weak 3G connection leads to dropped inputs, duplicate charges, and frustration.
Data pipeline flow and computational delegation across system layers:
Engineered around an offline-first paradigm using local SQLite and WatermelonDB. All mutations write synchronously to the local B-tree index in under 0.4ms. A background CRDT sync worker resolves state merges idempotently without data loss.
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