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Just shipped a major redesign of our search infrastructure. The new system handles 10x more queries per second with 50% less latency. Key insight: sometimes the best optimization is removing code, not adding it.
Hot take: The best engineering managers I've worked with spent at least 8 years as individual contributors before moving into management. You can't effectively lead engineers if you don't deeply understand the work they do.
Learned something fascinating about distributed consensus today. The CAP theorem isn't really about choosing two of three — it's about what happens during network partitions. When the network is healthy, you can have all three. The real question is your partition tolerance strategy.