In a first for Flirting with Models, my guest this episode is anonymous, going only by the handle LightSpringFox on Twitter. Mr. Fox is a quantitative trader who works in crypto market making at MGNR. Mr. Fox did not begin his career in crypto, nor even in market making. Rather, his background is in traditional equity factor investing, and so we spend a good deal of comparing and contrasting the low- and high-frequency domains. We also discuss the nature of market making edges, the unique risks of high frequency, how crypto and traditional finance market making deviate, and what Mr. Fox considers the “hardest problem in HFT.” Without further ado, please enjoy my conversation with LightSpringFox.