Design for failure by default. Use retries with backoff, idempotent handlers, and queue-based processing for non-critical tasks.
Cache aggressively at the edge and on device to reduce repeated round-trips. Prioritize fast perceived performance over perfect freshness.
Keep payloads small and APIs explicit. Contract discipline reduces bugs and improves reliability under stress.
Measure latency budgets per critical user flow and optimize the slowest link first.