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After that experience, I started rebuilding it using Go, Dart, and other languages. Then TypeScript came along, and eventually, it was rewritten in TS. Traditionally, FIX is written in lower-level languages, but there’s definitely an advantage to using TS, as it allows us to generate FIX messages directly in the browser.

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Another interesting thing that got me excited about HFT is the microwave networks that connect exchanges in the US. It's not often you can say "because fiber optic is too slow," but for these use cases, it's actually a technical advantage. Every piece of the stack is hyper-optimized!

Wouldn’t it be more accurate to say, lower latency?

Because surely fibre optics beats microwave on speed?

You're right. It's all about latency not throughput!

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