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Frontend interviews replace the algorithm round with component and hook implementation: build a debounced search, an accessible modal with a focus trap, or a useFetch hook with a proper loading state machine. The graded skills are state modelling, cleanup, and accessibility rather than complexity analysis. These run on the TypeScript executor and are checked against behavioural test cases.
A component, hook, or DOM-behaviour question rather than an algorithm.
15 problems. Each one runs in an in-browser editor against real test cases, with hints and a worked solution.
The patterns cheat sheet covers all of these in one page - what each one looks like in a problem statement, and the template that follows.