airbnb | Full-time | Interview Experience
Interview Date: Not specified
Result: Not specified
Difficulty: Not specified
Interview Process
The interview involved downloading a pre-existing Xcode project where the UI components were already implemented. The candidate was required to implement an algorithm on-site. They could choose to use either UIKit or SwiftUI, and opted for UIKit for reliability.
The main task was centered around a grid composed of cells, each having a specific color. The requirement was that if a cell had neighboring cells of a certain color, it should change its color to match those neighbors. Initially, only two colors were present, but follow-up questions expanded the task to include multiple colors with more complex rules, requiring the program to evolve continuously according to these rules.
The candidate had to ensure that the program ran smoothly after completing each part of the implementation.
Technical Questions
- Color Evolution Grid (Simulation, Grid, 2D Array)
Tips & Insights
Focus on ensuring that the algorithm can handle evolving rules and multiple colors efficiently. Make sure to test the program incrementally as you build each part.