~/boss / napkin-math
Back-of-the-envelope estimates
The Napkin
Size a chat app, a photo service and an LLM API before the clock runs out.
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How to beat it
Write the formula with its units, count the zeros first, then get closer. A day is 86,400 seconds, about 10⁵. The rush is a multiple of the average. Storage piles up for every day it's kept, once per copy, and 1 TB is 10⁹ KB. Headroom is room kept free on each GPU, so it shrinks the capacity instead of growing the load.
Now the real boss
Interviews ask for the code. Watch it run, then write it yourself, tested in Python, C++ or Java.
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