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Short summary

The author built an offline-first sync engine in Rust, shared between iOS/Android and backend via UniFFI, using event sourcing to handle conflict resolution. Instead of storing entity state, the system stores append-only domain events that fold into projections, making sync idempotent and orderable. The approach avoids the merge complexity of traditional offline sync frameworks like Couchbase.

• •Rust core shared across mobile and backend via UniFFI bindings
• •Event sourcing replaces state-merge with append-only event logs for offline sync
• •Events are append-only, idempotent to replay, and orderable across replicas

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