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Design Interview Questions

37 Design problems asked across FAANG and top tech companies. Approach hints, optimal solutions, and related problems.

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Adobe (1)Amazon (6)Apple (12)Atlassian (10)Databricks (7)Google (5)Meta (7)Microsoft (7)Netflix (6)OpenAI (8)Oracle (2)Ripple (2)Rippling (5)Salesforce (3)Uber (9)Walmart (4)

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Array (178)Backtracking (17)BFS (23)Binary Search (34)Binary Tree (13)Bit Manipulation (16)Breadth-First Search (20)Counting (7)Data Stream (6)Database (6)Depth-First Search (27)Design (37)DFS (24)Divide and Conquer (7)Doubly-Linked List (5)DP (10)Dynamic Programming (39)Graph (6)Graph Theory (13)Greedy (31)Hash Table (87)Heap (12)Heap (Priority Queue) (13)Linked List (15)Math (32)Matrix (22)Monotonic Stack (6)Ordered Set (8)Prefix Sum (11)Queue (10)Recursion (7)Simulation (11)Sliding Window (21)Sorting (45)Stack (24)String (85)Topological Sort (6)Tree (30)Trie (10)Two Pointers (30)Union-Find (13)
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✓ 0ProblemDifficultyCompaniesBreakdown / SolutionLeetCode
LRU CacheMedium9 companiesView breakdown →
Implement Trie (Prefix Tree)Medium6 companiesView breakdown →
Design Add and Search Words Data StructureMedium5 companiesView breakdown →
Find Median from Data StreamHard8 companiesView breakdown →
Serialize and Deserialize Binary TreeHard8 companiesView breakdown →
LFU CacheHard4 companiesView breakdown →
Snapshot ArrayMedium3 companiesView breakdown →
Flatten Nested List IteratorMedium3 companiesView breakdown →
Time Based Key-Value StoreMedium5 companiesView breakdown →
Insert Delete GetRandom O(1)Medium2 companiesView breakdown →
Design Memory AllocatorMedium3 companiesView breakdown →
Design Hit CounterMedium3 companiesView breakdown →
Min StackMedium3 companiesView breakdown →
Design SQLMedium1 companiesView breakdown →
First Unique NumberMedium1 companiesView breakdown →
Range Sum Query - ImmutableEasy2 companiesView breakdown →
Design Authentication ManagerMedium2 companiesView breakdown →
Design Logger Rate LimiterEasy2 companiesView breakdown →
Stock Price FluctuationMedium1 companiesView breakdown →
Design SpreadsheetMedium2 companiesView breakdown →
Design Excel Sum FormulaHard2 companiesView breakdown →
RLE IteratorMedium1 companiesView breakdown →
All O'one Data StructureHard1 companiesView breakdown →
Count Integers in IntervalsHard1 companiesView breakdown →
Design a Food Rating SystemMedium1 companiesView breakdown →
Design a Text EditorHard1 companiesView breakdown →
Design In-Memory File SystemHard1 companiesView breakdown →
Design Ride Sharing SystemMedium1 companiesView breakdown →
Design Snake GameMedium1 companiesView breakdown →
Design Task ManagerMedium1 companiesView breakdown →
Design Tic-Tac-ToeMedium1 companiesView breakdown →
Design Underground SystemMedium1 companiesView breakdown →
Encode and Decode StringsMedium1 companiesView breakdown →
Number of Recent CallsEASY1 companiesView breakdown →
Max StackHARD1 companiesView breakdown →
Shuffle an ArrayMEDIUM1 companiesView breakdown →
Design Add and Search Words Data StructureMedium4 companiesView breakdown →

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