DigitalOcean Interview Questions

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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

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

Contiguous Subarray Sum

Given an array of numbers, return true if there is a subarray that sums up to a certain number n . A subarray is a contiguous subset of the array. For example the subarray of 1,2,3,4,5 is 1,2,3 or 3,4,5 or 2,3,4 etc. js const arr 1, 2, 3 , sum 5 subarraySum arr, sum...

Difficulty: 4/10

Text Justification

Can you justify input text represented by an array of words so it looks pretty when printed and the whitespaces are balanced? For example, in the above image, we have an input array of "wow", "so", "cool", "is", "algodaily!" . This is a list of words we need to properly arrange, with the ideal ...

Difficulty: 9/10

Max Rectangle in a Histogram

We're given a histogram like the following, where contiguous sharing a common border or touching bars are made up of different heights. Let's assume all bars have the same width. The histogram is converted to an array of the heights of the bars: js const histArr 3, 1, 4, 2, 2, 1 ...

Difficulty: 8/10

Levenshtein Edit Distance

An edit distance is a way to quantify how different two strings are. This is calculated using **the minimum number of transformations to turn one string to another**. The transformations include insertion , deletion , and substitution . So when comparing two identical strings, say cat and ca...

Difficulty: 7/10

Find Duplicate Words

A very common interview challenge is to determine how often words appear in a given string or set of strings. Here's a version of this: return a list of duplicate words in a sentence. For example, given 'The dog is the best' , returns "the" . Likewise, given 'Happy thanksgiving, I am s...

Difficulty: 4/10

Grab a Random Node

Given a linked list, can you write a method to get a random node within it? Let's assume you're given a random node generator. The linked list will have at least 2 nodes, and may look something like this: 1 2 3 4 The odds of getting any number between 1 and 4 inclusive should b...

Difficulty: 4/10

Is This Graph a Tree

Given an undirected graph, can you see if it's a tree? If so, return true and false otherwise. An undirected graph lessons simple reference to graphs is a tree based _on the following conditions_: first, there cannot be a cycle. Second, the graph lessons simple reference to graph...

Difficulty: 7/10

JavaScript Basics

Introduction to JavaScript JavaScript is a popular programming language used for creating dynamic and interactive websites. It is a lightweight, interpreted language that runs on the client side in the browser as well as on the server side with the help of frameworks like Node.js . JavaScri...

Difficulty: 5/10

Building a Payment App

Welcome to the Introduction of the Building a Payment App tutorial! In this tutorial, we will explore the process of building a payment app from scratch using JavaScript and the MERN stack. This tutorial is designed to help you learn JavaScript and the MERN stack while developing a production read...

Difficulty: 5/10

Preparing for Frontend Development Interviews

Introduction Welcome to the Preparing for Frontend Development Interviews tutorial! This tutorial is designed to provide you with a comprehensive understanding of frontend development and help you prepare for frontend development interviews. In this tutorial, we will cover the following topics...

Difficulty: 5/10

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This information was sourced from reviews originally posted on Glassdoor.

Great engineering culture: There is a broad assumption of positive intent. Trust within and between teams.

There are quiet a few, the three most important to me are trust, transparency, and love. People here love what they do, and are always jumping in to do their best everyday and be a part of strong teams. Transparency with employees and customers is always considered, and I'm trusted to come in and do my job every day without micromanagement.

The path forward is starting to materialize with a new CEO and executive suite at the helm, with (seemingly) a lot of opportunity for innovation and career growth within the company.

Super remote-friendly, fast paced, lots of engineering challenges. Using a cool tech stack, cool architecture. Lots of opportunity for advancement. Very strong interview/onboarding process, upper-tier (not quite FAANG but still extremely good) compensation/benefits. Managers, mine at least, are vested in helping their direct reports succeed in their careers, get promoted, etc. Very supportive environment.