StackAdapt Interview Questions
On paper StackAdapt is the gentlest page in this set: four of its 12 questions are rated easy, and two of the rounds are HR screens rather than technical ones. What that undersells is the probability half. Beside a routine conditional-probability question about coin tosses sits an extinction probability in a branching process, which wants the generating function and its fixed point, not a simulation you can talk your way around. The engineering questions favour explaining over typing, analysing the time complexity of dictionary operations and saying why the amortised bound holds, then describing how hash collisions get resolved and where Java's HashMap switches its bucket representation once a chain grows long. Two are design prompts: a key-value store with time-windowed reads, and a recipe and inventory ordering service that has to reserve stock before it promises anything to the customer. Five of the reports came from Software Engineer candidates and one from a Data Scientist. Written solutions cover four questions, one opens in a runnable console, and the entire page is free to read.
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