Robinhood · Senior Web Infrastructure Developer (6 years)

Rounds

1. Phone Technical Screen

Questions asked

• Vanilla JavaScript coding task: Given an HTML page with a 3x3 grid of rectangles and a class with empty methods, implement a chainable API for selecting and manipulating rectangles.
• Example usage:

RectanglesClass
  .selectById(13)
  .color("red")
  .afterDelay(500)
  .shiftByPx(10)
  .color("green");

• Main things tested:
  • Implementing chainable class methods
  • Updating DOM elements
  • Handling delayed actions
  • Preserving execution order in a method chain
  • Basic JavaScript class/API design

Tips

• It was more focused on practical vanilla JS and async behavior than algorithms.
• Practice chaining methods and managing async actions in JS classes.