Proofpoint Interview Questions

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

Sum Digits Until One

We're provided a positive integer num . Can you write a method to repeatedly add all of its digits until the result has only one digit? Here's an example: if the input was 49 , we'd go through the following steps: start with 49 4 9 13 since the previous addition was 13, move ont...

Difficulty: 4/10

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

Delete Node From End

Removing the Nth Node From a Linked List's End: A Single Pass Approach Get ready to sail through a classic problem: Removing the n th node from the end of a linked list in a single pass. By the end of this lesson, you'll be able to wave goodbye to that pesky n th node and still maintain the lis...

Difficulty: 6/10

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

Sum of Perfect Squares

A perfect square is a number made by squaring a whole number. Some examples include 1 , 4 , 9 , or 16 , and so on because they are the squared results of 1 , 2 , 3 , 4 , etc. For example: 1 2 1 2 2 4 3 2 9 4 2 16 ... However, 15 is not a perfect square, bec...

Difficulty: 7/10

How Many Strongly Connected

Given a directed graph lessons simple reference to graphs represented via an adjacency list, write a class StronglyConnectedComponents with a count method that would return the number of strongly connected components in a graph. The definition of a strong connected component is a subgr...

Difficulty: 8/10

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

Two Stack Queue

Building a Queue with Two Stacks: A Challenge in Engineering Elegance The Objective: Queue with Stacks In this challenge, your task is to implement a queue using two stacks. While many programming languages offer queues through arrays or lists, we're restricting our approach to only utilize ...

Difficulty: 6/10

Find Shortest Palindrome Possible

We have a string str like the following: js const str "bubble" Find a way to convert it to a palindrome by inserting characters in front of it. Recall that a palindrome is defined as "a word, phrase, or sequence that reads the same backward as forward". What's the shortes...

Difficulty: 5/10

Fundamental Understanding

Introduction to Fundamentals Welcome to the **Introduction to Fundamentals** section of the course! In this section, we will provide an overview of the foundational concepts in **statistics**, **probability**, and **linear algebra** for **machine learning** and **AI**. As a senior engineer wi...

Difficulty: 5/10

Advanced OOP: Class Access, Modifiers, Overloading

In this lesson, we'll be covering Advance Practices in Object Orientated Programming . After getting through all the fundamentals of OOP, this tutorial is going to be a bit more relaxing. We will discuss some advanced practices with this technique. Keep in mind that these practices are essential ...

Difficulty: 5/10

Problem Solving With Recursion vs. Iteration

Iteration and recursion are both techniques that you can use for implementing solutions in a programming language. I look at both of them as a way of **thinking about a problem** and solving it. The most important thing to keep in mind before we start discussing them is: **For any problem that can...

Difficulty: 5/10

Interview Reports

61 Proofpoint Interview Questions Answers...

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People at Proofpoint Say

This information was sourced from reviews originally posted on Glassdoor.

It WAS an amazing company. Great people! I thought upper management cared.

Easy to get in for intern position, but I'm not sure if that's the same for the full-time position though. Did not even have an whiteboard interview.