Insights · Article · Engineering · May 7, 2026
Service workers, local persistence, optimistic UI, and merge rules when field workers and travelers edit records without continuous connectivity.
Progressive web apps promise near-native reach without app store friction. Offline-first adds complexity: queued mutations, partial failures, and conflicts when two edits converge on stale versions.
Choose a consistency model deliberately. Last-write-wins is simple until regulated domains need audit trails. Operational transform and CRDTs help specific collaborative domains but are not free magic.
Service worker update strategy affects how fast security patches reach clients. Document refresh prompts versus silent updates.
Storage quotas and eviction policies should be tested on low-end devices. Silent data loss is worse than an honest offline error.
Authentication tokens expire while offline. Design reauth flows that do not discard queued work.
Testing should simulate flaky networks with packet loss and captive portals, not only airplane mode toggles.
Privacy considerations include local caches of sensitive records on shared devices. Timeout locks and wipe commands belong in the threat model.
Finally, measure conflict rates and resolution time by feature. Spikes indicate unclear ownership or missing server constraints.
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