Plaid Interview Questions
Most of Plaid's interview signal is gathered before the onsite: 12 of the 18 questions here came from a technical screen, and none is rated hard, with 13 medium and 3 easy. The coding set has an obvious house style. Three separate questions are variants of one throughput puzzle: counting completed jobs in a serial single-worker pipeline, then the same thing with several workers, then computing makespan when ordered jobs run across parallel workers. Model a pipeline as a queue with per-stage service times and you have the whole family. Design questions stay close to what Plaid sells. One asks for an embeddable pay-by-bank widget, where the constraints that matter are the iframe boundary, bank-side latency and what happens when a user abandons the flow halfway through authorisation. A ChatGPT-style conversational assistant also appears, one of 3 questions from Machine Learning Engineer loops. Behavioural rounds ask you to walk through a project's scope, its timeline and how you delegated the work. Almost none of this page is gated, at 94% free, and 7 of the questions can be run in a coding console.
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