How Expensify achieves extreme concurrency with NUMA balancing
If you've never heard of "NUMA", you aren't alone – it's a bit of an IYKYK topic that very few engineers encounter in their entire careers. But if you've ever worked on an extremely high core-count server, these four letters will put shivers down your spine. Here’s a deep dive into how Expensify's core hardware works – down to the chip level – with an explanation of how that enables a critical feature of our software to work. We hope you'll find it useful as you architect your own NUMA-balanced applications on your own high-density servers!
