I do high-frequency trading, mostly in C++ and q/kdb+. I am a pro tem moderator of Quant SE. My views are my own and do not reflect the same of my employer.
My favorite answers:
Separating the wheat from the chaff
How much data is needed to validate a trading strategy
Time-series similarity measures
Column-oriented storage for tick data
A new programming language can only succeed if it capitalizes on an emerging frontier
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