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How Etsy gets its mobile apps ready for peak traffic
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Most advice about surviving a traffic spike is about capacity. Scale the fleet, warm the caches, load test the checkout path. All of it assumes you can fix whatever breaks the moment you find it. Mobile apps don't work that way. I spent an hour on a workshop with Jay Henry, a senior engineering manager at Etsy who owns engineering strategy across three teams covering CI, build, test, release, observe, and SRE. Jay's take: a web team having a bad day can revert in minutes. The debugging still has to happen, but it happens with the bad code already off production. Mobile has no revert. Once a bug ships inside a binary, it has to travel the whole path out: discovery, root cause analysis, reproduction, design, testing, merge, submission, app store review, and rollout. You can't control when or if users install the fix, and if they don't, the broken version keeps running. So Etsy's holiday prep isn't a capacity exercise. It's a set of decisions made in October about what they'll be able to see, route, and mitigate in November, when reverting isn't an option.
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