Day 15 — The AI/ML mock interview: coding, concepts, and the case study

The calendar invite says "ML round — 60 min" and it's tomorrow at ten. You've built fourteen days of models by hand, and somewhere in your head all of it is there: the loop, the split, the gradient, the forest, the block of attention. What you don't know is what it looks like under a clock, with someone watching you type and asking "why √d?" while you're still writing the softmax. Today is the dress rehearsal. Same lights, same timing, no audience yet. Nothing new gets built — every line of code on this page is a compact version of something you already wrote — but every one of them is run aga…