Browse-to-checkout at 3–5× last peak, including payment sandbox and inventory checks — the bottleneck is usually the database or a third-party call, and better found in October.
Change freeze on the money path before peak, feature flags armed as kill switches, and rollback rehearsed — velocity resumes in January.
Queue-it-or-cache-it plans for search, recommendations, and non-critical calls; static fallbacks ready — partial service beats a white screen defending full service.
Payment failures, inventory oversells, and shipping cutoffs get runbooks and on-call owners — ops readiness converts incidents into footnotes.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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