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Stripe DSA Interview Questions

Interviewing at Stripe in 2026? Here's the DSA sheet built around what Stripe's coding rounds actually reward: clean, production-quality code over clever one-liners. Stripe's interviews are famous for practical, API-shaped problems — string parsing, rate limiters, payment retry logic, and object-oriented design — layered on top of core data structures like hash maps, trees, and graphs. Expect a strong emphasis on edge cases, readable code, and the ability to extend your solution when the interviewer changes the requirements mid-round. This sheet compiles 59 of the most frequently reported Stripe interview questions from LeetCode and GeeksforGeeks, tagged by topic, difficulty, and real candidate-reported popularity, so you can prep exactly what Stripe interviewers ask instead of grinding random problems.

59 Problems
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1. Two Sum
LeetCode•
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Hot
2. Valid Parentheses
LeetCode•
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Hot
3. Merge Intervals
LeetCode•
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Very Hot
4. Insert Interval
LeetCode•
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Hot
5. Meeting Rooms II
LeetCode•
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Hot
6. Employee Free Time
LeetCode•
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Hot
7. My Calendar I
LeetCode•
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Hot
8. Design Underground System
LeetCode•
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Warm
9. Design Hit Counter
LeetCode•
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Hot
10. Logger Rate Limiter
LeetCode•
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Hot
11. Design Bounded Blocking Queue
LeetCode•
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Warm
12. LRU Cache
LeetCode•
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Very Hot
13. Design a File System
LeetCode•
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Warm
14. Group Anagrams
LeetCode•
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Hot
15. Longest Substring Without Repeating Characters
LeetCode•
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Hot
16. Minimum Window Substring
LeetCode•
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Warm
17. String to Integer (atoi)
LeetCode•
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Hot
18. Basic Calculator
LeetCode•
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Warm
19. Basic Calculator II
LeetCode•
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Warm
20. Decode String
LeetCode•
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Warm
21. Parse Nested List Weight Sum
LeetCode•
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Warm
22. Validate IP Address
LeetCode•
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Warm
23. Design URL Shortener (TinyURL)
LeetCode•
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Hot
24. Design In-Memory File System
LeetCode•
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Warm
25. Number of Islands
LeetCode•
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Warm
26. Course Schedule
LeetCode•
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Warm
27. Accounts Merge
LeetCode•
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Hot
28. Evaluate Division
LeetCode•
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Hot
29. Redundant Connection
LeetCode•
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Warm
30. Reconstruct Itinerary
LeetCode•
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Warm
31. Alien Dictionary
LeetCode•
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Warm
32. Binary Tree Level Order Traversal
LeetCode•
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Warm
33. Lowest Common Ancestor of a Binary Tree
LeetCode•
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Warm
34. Serialize and Deserialize N-ary Tree
LeetCode•
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Warm
35. Implement Trie (Prefix Tree)
LeetCode•
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Hot
36. Design Add and Search Words Data Structure
LeetCode•
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Warm
37. Top K Frequent Elements
LeetCode•
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Warm
38. Task Scheduler
LeetCode•
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Hot
39. Sliding Window Maximum
LeetCode•
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Warm
40. Coin Change
LeetCode•
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Warm
41. Coin Change II
LeetCode•
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Warm
42. Maximum Subarray
LeetCode•
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Warm
43. Product of Array Except Self
LeetCode•
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Warm
44. Subarray Sum Equals K
LeetCode•
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Hot
45. Random Pick with Weight
LeetCode•
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Warm
46. Insert Delete GetRandom O(1)
LeetCode•
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Warm
47. Design Twitter
LeetCode•
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Warm
48. Design a Rate Limiter
GeeksforGeeks•
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Hot
49. Implement a Circuit Breaker Pattern
GeeksforGeeks•
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Warm
50. Design a Payment Retry System
GeeksforGeeks•
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Hot
51. Design a Consistent Hashing Ring
GeeksforGeeks•
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Hot
52. Idempotency Key Handling in APIs
GeeksforGeeks•
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Hot
53. Detect Cycle in a Directed Graph
GeeksforGeeks•
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Warm
54. Find All Valid Currency Conversion Paths
GeeksforGeeks•
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Warm
55. Longest Common Subsequence
GeeksforGeeks•
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Warm
56. Round Robin Scheduling Simulation
GeeksforGeeks•
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Warm
57. LFU Cache Implementation
LeetCode•
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Warm
58. Design a Distributed Unique ID Generator
GeeksforGeeks•
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Hot
59. Sliding Window Rate Limiter Algorithm
GeeksforGeeks•
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Hot