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Designing Reliable SMS Verification for US Signup Flows

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The article argues that SMS verification should be built around explicit reliability boundaries, with challenges created once, queued durably, and sent through replaceable provider adapters. It stresses single-use, expiring tokens, idempotency keys for each send attempt, and observable provider responses so duplicate or lost messages are avoided. Delivery receipts are treated as evidence of transmission rather than proof a person read the message, and timeouts are treated as unknown outcomes requiring investigation. The author also warns that failover to a second provider can create duplicate valid links, and that US carrier registration, filtering, and throughput often matter more than API convenience when choosing a provider.

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