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rippling·Software Engineer·Technical Phone Screen·Intermediate

IntermediatePrefer not to say
May 2026

Summary

Rippling had me do an object-oriented design problem centered on poker hand comparison. Not the usual LeetCode grind, which I appreciated, but it still caught me off guard in terms of scope.

Questions Asked (1)

Q1

Design a poker hand comparator: given two hands of cards, determine which hand wins. If both hands are the same type (e.g. flush, full house, three-of-a-kind), break the tie by comparing the relevant card values.

System DesignAlgorithms & Data StructuresTechnical Trade-offs
Author's notes

I spent the first few minutes just trying to nail down the ranking of hand types before touching any code.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the rules and constraints, then outline a modular design that evaluates each hand independently and compares them. Focus on a clean ranking system and tie-breaking logic, and discuss trade-offs between simplicity and extensibility.

Pro tip: Demonstrate awareness of edge cases like ace-low straights and kicker comparisons, and suggest a data-driven approach (e.g., precomputed hand rankings) to balance performance and maintainability.

1. Clarify Requirements

Ask about poker variant (e.g., Texas Hold'em), hand size, and whether to support wildcards or jokers. Confirm input format and expected output.

2. Design Hand Evaluation

Create a function that takes a hand and returns its type (e.g., flush, straight) and a sorted list of tie-breaking values. Use a ranking system for hand types.

3. Implement Comparison Logic

Compare hand types first; if equal, compare tie-breaking values lexicographically. Ensure correct handling of special cases like ace-low straights.

4. Optimize and Test

Consider performance optimizations (e.g., bitwise operations for hand evaluation) and write unit tests for all hand types and edge cases.

5. Discuss Trade-offs

Talk about trade-offs between a simple, readable implementation and a highly optimized one. Mention extensibility for other poker variants.

Key Points to Mention

  • Hand ranking system (e.g., enum or constants for hand types)
  • Tie-breaking logic using sorted card values and kickers
  • Edge cases: ace-low straight (A-2-3-4-5), multiple players, community cards
  • Performance considerations: precomputed lookup tables, bit manipulation
  • Modular design: separate evaluation from comparison for testability
  • Extensibility: supporting different poker variants or wildcards

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.