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Groupon Interview Questions Groupon Interview Reports Engineering at Groupon Career Levels and Compensation

Someone at Groupon says...

Work life balance is good, my immediate manager gives me room to do what I need to do. Some of the technical problems are interesting challenges, when we have time to work on them.

Groupon Interview Questions

Note: ensure you read the disclaimer on the previous page reading the accuracy and sourcing of these problems.

Implement a Binary Search Tree

Let's implement a Binary Search Tree ! Recall that a binary search tree , or a BST , is a binary tree lessons an intro to binary trees and search trees that is ordered via these two properties: 1. The left sub tree of a node has a value less than or equal to its parent node's value. 2. The ...

Difficulty: 6/10

Max of Min Pairs

We have an array of length 2 * n even length that consists of random integers. 1, 3, 2, 6, 5, 4 We are asked to create pairs out of these integers, like such: 1, 3 , 2, 6 , 5, 4 How can we divide up the pairs such that the sum of smaller integers in each pair is maximized? ...

Difficulty: 4/10

Power of Three

Given an integer num , write a method to determine if it is a power of 3. The method will be called as follows: js console.log powerOfThree 9 true console.log powerOfThree 7 false Constraints The given would be a non zero positive integer in the ran...

Difficulty: 3/10

Single Lonely Number

In a given array of numbers, one element will show up once and the others will each show up twice. Can you find the number that only appears once in O n linear time? Bonus points if you can do it in O 1 space as well. lonelyNumber 4, 4, 6, 1, 3, 1, 3 6 lonelyNumber 3, 3, 9 9...

Difficulty: 3/10

Zeros to the End

Write a method that moves all zeros in an array to its end. You should maintain the order of all other elements. Here's an example: js zerosToEnd 1, 0, 2, 0, 4, 0 1, 2, 4, 0, 0, 0 Here's another one: js zerosToEnd 1, 0, 2, 0, 4, 0 1, 2, 4, 0, 0, 0 F...

Difficulty: 5/10

Implement a Hash Map

Arrays are amazing for looking up elements at specific indices as all elements in memory are contiguous, allowing for O 1 or constant time lookups. But often we don't, or can't, perform lookups via indices. Hash maps and hash tables are a way around this, enabling us to lookup via keys instead. ...

Difficulty: 3/10

Validate a BST

Given a binary search tree like the one below, can you write a function that will return true if it is valid? 5 3 9 1 4 Recall that a BST is valid only given the following conditions: The left child subtree of a node contains only nodes with v...

Difficulty: 4/10

Implement a Graph

Since a graph lessons simple reference to graphs is one of the more difficult data structures to conceptualize in a programmatic 2D manner, let's go ahead and implement it! We'll go with an adjacency list version. Note that there's also the adjacency matrix method which we will cover later....

Difficulty: 4/10

Telling the Story with Data

Still generating... This lesson is currently still being generated, please wait... thanks! **Please refresh in a minute or two to see updates.** ...

Difficulty: 5/10

File Handling in C++

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Difficulty: 5/10

Lesson 4: System Design and Architecture

Introduction to System Design System design plays a crucial role in software development, as it focuses on the **planning and organization** of a complex application. It involves making important decisions about the **architecture, components, and interfaces** of the system to ensure its **spee...

Difficulty: 5/10

Higher Order Functions in Javascript

A function is a chunk of code intended to reduce code repetition and enhance code quality. JavaScript, a function based programming language, leverages higher order functions to integrate the concept of **abstraction**. Today, we will discuss the concept of higher order functions in JavaScript...

Difficulty: 5/10

People at Groupon Say

This information was sourced from reviews originally posted on Glassdoor.

The CTO has created a toxic environment where everyone is afraid for their job, and no disagreement with him is allowed without fear of repercussions. Cost cutting has led teams to only be able to keep the lights on, with no time for actually improving the software. Layoffs are being done with a goal of creating attrition due to uncertainty, instead of doing them and then moving forward. People as a result are unable to focus on their work and create momentum. Take pro-active steps to retain the remaining technical talent that you have left. Do not treat engineers like disposable commodities, or you will have no-one left capable of fixing a SEV1 caused by brain drain and new sub-standard engineers.

In general, people are really friendly and well intentioned. Everyone I've met within HR, benefits, support and other engineering groups have all been really helpful, standup people. Even a few really interesting characters. The selection of technologies in use, in my opinion, is questionable. I can't get into detail but the choices being made do not make me think that Groupon is investing money and talent into the right places. The unusual bits of culture within the company. "Inclusion" groups and the like, to me, are extremely weird and creepy. None of it has been mandatory, but it's never the less extremely odd to me. Sensitivity to terminology could not be more understated. Be cautious if you have an advanced vocabulary. People here have the propensity to Google words and take the first definition without context and react with vigor. Personally I find this behavior pretentious, but it is the way of the younger crowds. Speak carefully with small words.

Friendly and smart people, great and diverse company culture, nice office and amenities. They seem to be focused on gauging and improving employee satisfaction, maybe due to past turnover. I love my manager and I like the people I’ve met up the chain too. They’re very involved and helpful, and I like having the weekly manager one on one. Lots of people have stuck around 5+ years. Challenging problems to work on at scale. Good benefits too. Not great base compensation for engineers. There have been some high profile departures recently. Poor stock performance. Some startup tech baggage and slow evolution. Uncertainty about long term company prospects, lack of growth. Weak hiring pipeline.

One of the strengths of Groupon as an employer is its great work culture. Very supportive and collaborative work environment. The benefits are pretty good. Unlimited PTO policy is really amazing, especially at times when you have unexpected need for time off. They have standard health / Dental and Vision. High attrition across the company and also at the leadership levels. This leads to frequent re-orgs, sometimes change in direction and focus.