Netflix
6 questions · Coding · System design · Behavioral
Design and implement an LRU cache with O(1) get and put.
CodingApproachCombine a hash map with a doubly linked list; move touched nodes to the front, evict from the tail.
EvaluatesComposing data structures to hit tight time bounds and getting the eviction bookkeeping right.
Return the k-th largest element in an unsorted array.
CodingApproachA size-k min-heap, or quickselect for average O(n); discuss the trade-offs.
EvaluatesHeap vs. selection trade-offs and awareness of average vs. worst case.
Design a social news feed.
System designApproachDiscuss fan-out on write vs. read, ranking, pagination, and the celebrity/hot-key problem.
EvaluatesHandling scale skew and picking the right fan-out strategy.
Design a real-time chat / messaging system.
System designApproachCover connection handling (WebSocket), delivery/ordering guarantees, storage, and presence.
EvaluatesReal-time delivery, ordering, and durability under scale.
Describe a project you are most proud of and your specific contribution.
BehavioralApproachAnchor to measurable impact; be crisp about what YOU did vs. the team, and the trade-offs you made.
EvaluatesOwnership, impact, and honest self-attribution.
Tell me about a time you made a high-judgment decision without full information.
BehavioralApproachLean into the "freedom & responsibility" culture: context, the bet you made, and the outcome.
EvaluatesIndependent judgment and ownership in a low-process environment.
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