Yelp Interview Questions

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

Merge Intervals

This is a classic interview question that is used in _a lot_ in technical interviews, frequently in the form of a calendar or meeting management application. As such, we'll also assume the same use case, as it's easier to visualize. Suppose we're given a few arrays, like 1, 4 , 2, 5 , 7,...

Difficulty: 5/10

Validate Palindrome

Given a string str , can you write a method that will return True if is a palindrome and False if it is not? If you'll recall, a palindrome is defined as "a word, phrase, or sequence that reads the same backward as forward". For now, assume that we will not have input strings that contain spec...

Difficulty: 3/10

Build a Calculator

Let's build a very basic calculator by programming it! You've probably seen one that look similar to this: But we won't be building a physical calculator HardwareDaily will need to wait! instead, we'll be writing a simple program that can serve as one. Can you write a function that will evalua...

Difficulty: 7/10

Generate All String Permutations

Write an algorithm that takes an input string like "abc" , and prints out all possible permutations of the string. A permutation of a group of elements is defined as one of the n! number possible arrangements the elements can take, where n is the number of elements in the range. We'd expect t...

Difficulty: 6/10

Detect Substring in String

How would you write a function to detect a substring in a string? If the substring can be found in the string, return the index at which it starts. Otherwise, return 1 . js function detectSubstring str, subStr return 1 Important do not use the native String clas...

Difficulty: 4/10

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

Reverse a Linked List

You're sent a linked list of numbers, but it's been received in the opposite order to what you need. This has happened multiple times now, so you decide to write an algorithm to reverse the lists as they come in. The list you've received is as follows: 7 2 21 6 42 10 Write ...

Difficulty: 6/10

Merge Two Binary Trees

Merging Two Binary Trees The Problem Statement You are presented with two binary trees. Your task is to merge these trees into a single, new binary tree. ! Merging Binary Trees https: storage.googleapis.com algodailyrandomassets curriculum trees merge two binary trees cover image.png ...

Difficulty: 5/10

Linked List to Binary Search Tree

We're given a sorted singly linked list that is, a linked list made of nodes with no pointers to the previous node where the elements are already arranged in ascending order. js 9 2 3 5 9 Linked List Node Definition: function Node val this.val val this...

Difficulty: 7/10

Testing and Debugging Java Projects

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

Database Isolation Levels

In this lesson, we will learn about database transactions and isolation levels with a focus on following key points: 1. What are transactions in databases? 2. Learn about the read phenomena in database systems. 3. Understand the levels of database isolation. A database , as you...

Difficulty: 5/10

JavaScript Basics

Introduction to JavaScript JavaScript is a high level programming language that is widely used for frontend web development. It is a key technology for creating interactive and dynamic websites. JavaScript runs on the client side, meaning it is executed by the user's web browser. This allows f...

Difficulty: 5/10

People at Yelp Say

This information was sourced from reviews originally posted on Glassdoor.

Great culture for engineering They really care about personal development of employees Transparent org Great manager. They spend on training manager. If you don't like your manager, you should give feedback and report it. They will try to work on the situation. Great company to start your engineering culture with. No free lunches No game changing work happening in engineering, we are just working to be on par with tech stack in other companies. Be fast in rolling out features. Have team Yelp X or something that secretly work on game changing tech (AR / AI)

Work/life balance: you can walkout free of mind when your day is over Collaborative work culture: no politics within Engineering. Working on a high visibility/popular consumer app. Continue focusing on keeping the product and the infrastructure up to date and fresh. It is exciting to see all these upcoming projects. Be bold, don't hesitate to try new avenues. Be a better champion for your staff and listen to their requests: it took 2 years for the sick time problem to be heard and 6 more months until we hear the proposed solution. The staff skews towards new grads heavily and can lead some demographics to feel old quickly.

Great work-life balance. Generous benefits (on par with other Bay Area tech companies). Strong engineering culture. Engineering and recruiting actively care about improving diversity and creating an atmosphere where everybody is welcome. Yelp’s public reputation may be iffy, but most of the people who work there are amazing. The majority of engineers are nice, helpful people. Jeremy Stoppelman seems like a truly good person who has the best intentions for the company and who wants to put good things back into the world. The weird part of working for Yelp was balancing the public’s perception with my own experience since the two tended to clash.

Engineers are clever and experienced. Managers are understanding and not pushy. Relaxed and laid back work environment. Free beer on tap, and good variety of snacks. Work life balance. Unmotivated engineers and managers. Lack of notice on product details, nothing new to work on except on data mining team. Very conservative approach to product and too many unmaintained features inside app. Try to move product forward. Yelp has huge potential Try to keep engineers motivated.