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Chime·Backend Engineer·Technical Phone Screen·Intermediate

Intermediate
May 2026

Summary

Chime backend interview that threw a full game simulation problem at me. Not your typical CRUD or algorithm warm-up, this one required thinking through data modeling and game state logic at the same time, which I wasn't really prepared for.

Questions Asked (1)

Q1

Implement a function that takes a board size and a list of moves for a two-player board game, then returns the current board state or winner. The game involves placing pieces, toppling stacks in cardinal directions, and capturing opponent pieces. You need to define your own data model for the board, stacks, and ownership.

Algorithms & Data StructuresData ModelingSystem Design
Author's notes

I spent probably the first five minutes just trying to nail down the data model before writing any logic, which I think was the right call but I second-guessed myself the whole time.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the game rules and defining a clear data model for the board, stacks, and ownership. Then outline the move execution logic, including toppling and capturing, and finally discuss how to determine the winner or current state.

Pro tip: Demonstrate foresight by discussing edge cases like invalid moves, board boundaries, and stack overflow, and suggest a modular design that separates game logic from data representation for easier testing and extension.

1. Clarify Requirements

Ask questions to confirm ambiguous rules: board size, move format, toppling mechanics, capture conditions, and win conditions. Ensure you understand the expected output format.

2. Design Data Model

Define classes or structures for Board, Stack, and Player. Decide how to represent ownership (e.g., player ID on each piece) and how stacks are stored (e.g., list per cell).

3. Implement Move Execution

Process each move: place a piece, topple the stack in the specified direction, and handle captures. Update the board state accordingly, managing stack sizes and ownership changes.

4. Determine Winner/State

After all moves, evaluate the board to check for a winner (e.g., most pieces, specific capture condition) or return the current board state. Consider if the game can end early.

5. Test and Validate

Walk through a simple example to verify logic, and discuss potential edge cases like invalid moves, boundary conditions, and stack limits.

Key Points to Mention

  • Clear separation of concerns: data model vs. game logic
  • Handling of stack toppling and capture mechanics
  • Edge cases: invalid moves, board boundaries, stack overflow
  • Efficiency considerations for large boards or many moves
  • Modularity and extensibility for future rule changes
  • Testing strategy with unit tests for move execution and win conditions

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