down the entire order funnel. It was just one of twenty-three deeply nested API calls made whenever someone checked for product availability. Even after a year, this problem remained unfixed. It was simply too expensive to shore up all twenty-three APIs to be a Tier 1 service—an SLA that requires five-nines of uptime, guaranteed response within ten milliseconds, and all sorts of other things that cost tons of money. What’s always bothered her was why twenty-three API calls were needed in the first place, why they had to respond within milliseconds, and why they had to be so expensive to run.
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