Developer Solves Duplicate-Request Problem Across Four Systems in One Day
A developer working across four repositories spent a day tackling a common failure mode: a second identical request undoing the work of the first. The fixes spanned a CRM's new headless lead-intake endpoint, which uses email-and-phone matching to merge repeat submissions without overwriting existing data or resetting deal stages. A staff event app gained idempotency-key middleware to prevent duplicate registrations and double-marked payments when queued writes are retried after connectivity loss. The middleware only caches successful responses, ensuring failed requests remain retryable under the same key. All four systems independently converged on the same design principle: safe, one-way state upgrades for repeat inputs.
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