Top 50 caching Interview Questions
The most frequently asked caching questions across all roles and companies, ranked by real interview frequency. Updated daily.
Optimize repeated range-sum computations with prefix sums instead of rescanning application workload data.
University of Florida
Cybertrend Engineering
Diamond FoundryImplement an LRU cache with O(1) get and put operations using a hash map and doubly linked list.
Collins Aerospace
Larsen & Toubro
Del Rey Systems & TechnologyImplement an LRU cache with constant-time get and put operations using a hash map and doubly linked list.
SnapBuild an LRU cache that reuses exact or semantically similar LLM responses while enforcing TTL and relevance thresholds.
FactsetImplement an LFU cache with LRU tie-breaking and O(1) get and put operations.
Meta
RipplingImplement an LRU cache with constant-time get, set, and delete operations using a hash map and doubly linked list.
RoktImplement a thread-safe LRU cache using constant-time lookups, updates, eviction, and synchronization.
Citadel
Bain &
GoogleImplement an LRU API cache with TTL expiration, hit tracking, and capacity-based eviction.
Epsilon Systems
Apple
Innodata India PrivateSign up to see every question
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Return the first row for each unique value, then rank the k most frequent values.
EverlawReturn the latest valid market-data event for each known instrument using validation, joins, and row numbering.
Jane Street