The canonical multi-round build screen: a simple key-value store that grows new requirements every stage (TTL, transactions, scans). The signal is not stage 1, it is whether your code absorbs stage 4 without a rewrite. Here is how to design for it.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
The canonical multi-round build screen: a simple key-value store that grows new requirements every stage (TTL, transactions, scans). The signal is not stage 1, it is whether your code absorbs stage 4 without a rewrite. Here is how to design for it.
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