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rippling·Software Engineer·Technical Phone Screen·Intermediate

Intermediate
May 2026

Summary

Rippling SWE interview with a poker hand evaluator problem. You get two 5-card hands and have to figure out who wins. Classic enough premise but the edge cases pile up fast.

Questions Asked (1)

Q1

Given two 5-card poker hands, write a program to determine which hand wins.

Algorithms & Data StructuresTechnical Trade-offs
Author's notes

Seemed straightforward at first and then I started thinking about all the hand rankings and my confidence dropped pretty quick.

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AI HintsAI Generated

Suggested Approach

First clarify the rules and edge cases, then design a solution that evaluates each hand's rank and tiebreakers. Implement a function that returns a comparable score for each hand, and compare the scores to determine the winner.

Pro tip: Mention that you would write unit tests for all hand rankings and edge cases like ties and kickers, and discuss how to extend the solution to more than two hands or different poker variants.

1. Clarify Requirements

Ask about the poker variant (e.g., Texas Hold'em), hand rankings, and tie-breaking rules. Confirm input format and expected output.

2. Design Hand Evaluation

Create a function that takes a 5-card hand and returns a numerical score or a tuple representing its rank and tiebreakers. Consider using counts of ranks and suits.

3. Implement Comparison

Compare the two hands' scores, handling ties by comparing tiebreaker values. Return the winning hand or a tie indicator.

4. Handle Edge Cases

Test cases like straight flushes, royal flushes, and ties with equal ranks but different suits. Ensure the solution correctly identifies the winner in all scenarios.

5. Optimize and Discuss Trade-offs

Discuss time and space complexity, and consider alternative approaches like precomputing all possible hands or using bit manipulation for efficiency.

Key Points to Mention

  • Poker hand rankings and tie-breaking rules (e.g., kickers)
  • Data structures for efficient hand evaluation (e.g., frequency maps, sorting)
  • Edge cases: ties, straight flushes, and ace-low straights
  • Time and space complexity of the solution
  • Testing strategy: unit tests for each hand type and comparison
  • Extensibility: supporting more hands or different poker variants

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