I recently gave interview in Amazon for the position of Software development engineer. The overall experience was pretty good, so I thought of sharing the experience with everyone.


Total number of rounds: 4

  • Round 1: Focussed on Problem Solving and DS/Algo.
  • Round 2: Focussed on Low Level Design.
  • Round 3: Focussed on solving for a vague problem. Needed good logical abilities.
  • Round 4: Focussed on High Level Design.


Round 1:

Question 1:

Assume that weather.com is providing a list of forecasts. At any day, you want to find when the next warmer day is available.

  • input: [60, 90, 76, 80, 100, 62, 90]
  • output: [1, 3, 1, 1, 0, 1, 0]


  • Expected Complexity: O(N)
  • Approach: Solved by using a stack.

Question 2:

Given a complete binary tree, compute the number of nodes in the tree.

  • Expected complexity: O(Height^2)
  • Approach: We can count number of nodes intelligently by discarding half of tree at each level thus bringing down the complexity to H^2. We are able to reduce our space by using the special property of complete binary tree.

Round 2:

Design the score calculator system of Bowling alley game. The system should be invoked after player chance, should update the scores of all the players, should provide a dashboard for viewing. Some rules of bowling were given.

  • Expectation: Mostly the discussion went around how to make design scalable so that multiple types of scores like Spare, Strike are handled easily.

Round 3:

Given a link to a page, find out what all different links are reachable from this link. Also, keep a count of how many pages refer to a single page.
It was more like solving a real world vague scenario.

Round 4:

Design a system for messaging service like WhatsApp.
You can learn how to solve this problem here: https://youtu.be/0QfGpx7jDYw

Behaviour questions in all rounds:

All rounds had some behaviour questions in them. Some example of these questions are:

  1. What is most complex problem you have solved?
  2. Most interesting conflict you had?
  3. How did you convince of your design choices?