Amazon Interview Question for SDE-2s

Country: India

Comment hidden because of low score. Click to expand.
of 1 vote

@steephen 's answer explains about game implementation.
There are other things to consider in this problem (Related to Design and Scalability)

Read --

It is better to use Redis for auth tokens and sessions. Gameplay data can be stored in RDBMS or NoSQL if you want resume feature.

Coming to notification point, Let's have a scenario where you are waiting for an opponent. Cases will be
-> apps can easily have push notification.
-> for web-based games there are web-notifications
-> if any of above doesn't fit then we can create a game and same time create 1 topic ("nextGamePair") using JMS or RabbitMQ.
Every user waiting for the opponent will subscribe to this topic. When there are 2 players subscribe, we will start a game with those 2 players and unsubscribe them from the topic.

With 1 Topic we will handle this for all users.

All these things will cover aspects of this problem.

- Kunal Saxena January 25, 2018 | Flag Reply
Comment hidden because of low score. Click to expand.
of 0 vote

There are following independent services:
Authentication and authorization service- which will manage the session by using AccessToken
GameInitialization service- This service will identify the competitors and initialize the game instance
GameExecutionService - Which will manage the turn in between players

There should be an API gateway to control request pipeline to the system.

System should have following classes:
1. Grid

2. Game
Grid* grid

3. Player
Game id

int: x
int: y
player id
Game id

5. cell
bool occupied
int x
int y

- steephen September 14, 2017 | Flag Reply

Add a Comment

Writing Code? Surround your code with {{{ and }}} to preserve whitespace.


is a comprehensive book on getting a job at a top tech company, while focuses on dev interviews and does this for PMs.

Learn More


CareerCup's interview videos give you a real-life look at technical interviews. In these unscripted videos, watch how other candidates handle tough questions and how the interviewer thinks about their performance.

Learn More

Resume Review

Most engineers make critical mistakes on their resumes -- we can fix your resume with our custom resume review service. And, we use fellow engineers as our resume reviewers, so you can be sure that we "get" what you're saying.

Learn More

Mock Interviews

Our Mock Interviews will be conducted "in character" just like a real interview, and can focus on whatever topics you want. All our interviewers have worked for Microsoft, Google or Amazon, you know you'll get a true-to-life experience.

Learn More