Part 3/14:
At its core, this functionality depended on sophisticated backend systems that could process millions of metrics—such as profile views and likes—at an unprecedented scale. To do this, LinkedIn engineered an architecture capable of running analytical queries across 930 million users with a throughput of nearly 10,000 queries per second and latency under 100 milliseconds. Such performance was essential for a customer-facing platform, where delays beyond milliseconds could drive users away.