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Roblox Software Engineer Interview Questions

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Roblox is a billion-dollar video game development company that allows developers to create and play games created by other developers. The company has raised several million dollars in funding, with the most recent Series G funding valuing the company at $4 billion. 

The company is a great place to work for software developers, offering impressive growth and professional development opportunities. Roblox, however, has a stringent interview process that comprehensively evaluates the analytical and problem-solving abilities of applicants. a

Software engineers at Roblox make salaries between $221,000 and $1.2 Million, making Roblox one of the highest paying software companies in the US. 

If you are preparing for your upcoming Roblox interview, this article will cover Roblox coding interview questions, systems design interview questions asked at Roblox’s technical interview, Roblox phone interview questions, and Roblox behavioral interview questions. We also cover the interview process at Roblox and some noteworthy tips to help you nail the Roblox technical interview. 

Whether you’re a software engineer, coding engineer, software developer, engineering manager, or tech lead preparing for tech interviews, you must check out our technical interview checklist, interview questions page, and salary negotiation e-book to get interview-ready! 

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Here’s what we’ll cover in this article:

  • Roblox software engineer interview process
  • Roblox software engineer coding interview questions
  • Roblox systems design interview questions
  • Roblox software engineer behavioral interview questions
  • Tips to crack the Roblox technical interview
  • FAQs on Roblox technical interview

Roblox Software Engineer Interview Process

The interview process at Roblox predominantly tests your coding and systems design knowledge. You’re also asked a few behavioral questions where recruiters evaluate your attitude towards general workplace situations. 

The process consists of three main stages -- the recruiter screen, the technical phone screen interview, and the on-site interview. Let’s take a look at the interview process in detail: 

Recruiter Screen

The recruiter screen is the first round that involves interacting with a human resources professional from Roblox. The idea behind this round is to help recruiters understand the basic attributes of your professional profile. You’ll be asked questions about your skills, experience, and why you’re looking to make the switch to Roblox. If your skills match the requirements of the role, you’ll be called for the technical phone screen interview.

Technical Phone Screen

The technical phone screen interview is a remote interview round where a hiring manager asks you to solve a coding problem in data structures and algorithms. The coding problem won’t be too difficult. Hiring managers mainly seek to understand your approach to analytical problem solving and how you’re able to use core DSA concepts to arrive at the optimal solution. Understanding the problem and knowing what approach to take is key in this round. 

On-Site Interview

The on-site interview consists of three to four rounds. A typical Roblox on-site interview will include:

1 to 2 Coding Rounds 

These rounds test your coding skills in DSA and algorithms, as well as your command on the chosen OOP language. The difficulty level of problem(s) in this round is usually moderate to hard. Your ability to analytically solve the given problem and arrive at the most optimal solution is evaluated in these rounds. Make sure to practice whiteboard coding as you may be asked to write your solution code on a whiteboard. 

1 to 2 Systems Design Rounds

These rounds specifically evaluate your knowledge in distributed systems design. You can expect questions on designing an arbitrary system with the given specifications, systems security, network protocols, and concepts in scalable systems.  

1 Behavioral Round

This round specifically focuses on evaluating specific characteristics of your personality. Your attitude towards workplace-related situations, general ethics in conflicting situations, challenging past projects, and leadership skills are evaluated. 

Roblox Software Engineer Coding Interview Questions

Coding questions are asked in the Roblox technical phone screen and on-site rounds. Questions asked are usually around the topics below:

Let’s look at some sample Roblox coding interview questions:

  1. You are given a linked list “L,” Write a program function to pick a random node from the linked list. 
  2. You are given a positive array with n positive integers. Write a program to determine the inversion count of the array. 
  3. You are given a binary tree T. Write a program to print the right view of the tree. 
  4. You’re given a binary tree T. Write a code to print the height of the binary tree. 
  5. For a given binary tree, write a program to connect the nodes of the binary tree that are at the same level. 
  6. For a binary search tree with unique values, two node values are given. Write a program to find the lowest common ancestors of the two nodes. 
  7. Write a code to convert a given binary tree to a Doubly Linked List (DLL) in place. The left and right pointers in the nodes are to be used as previous and next pointers, respectively, in the converted DLL.
  8. Write a code to count the leaves in a given binary search tree BT. 
  9. Write a program function to implement the serialize and deserialize functions for a given binary search tree.
  10. Given an array of integers, write a program to return the next greater element for each element in the array. The array comprises all distinct numbers. If a greater element doesn’t exist to the right of a given element, the value returned in that position should be -1. 

If you want to check out more popular problems asked at Roblox’s coding interview along with optimal code solutions, check out our Problems Page to access a huge list of coding problems along with solutions. 

Roblox Software Engineer Systems Design Interview Questions

Systems design interviews are an important component of the Roblox technical interview. Being a gaming company, your knowledge of scalable systems has to be pretty much up there. 

Here is a list of topics that feature in systems design interviews at Roblox: 

  • Basics of systems design
  • Network protocols
  • Scalable systems and scaling applications
  • Replication
  • Caching
  • Storage and retrieval
  • MapReduce and distributed file systems
  • Concurrency 
  • Basics of API modeling 
  • Sharding techniques
  • Measuring the performance of scalable systems

Below are some sample systems design interview questions asked at interviews. 

  1. How would you go about designing a proximity server?
  2. How would you go about designing a 3D game?
  3. How would you go about setting network protocols while designing a game?
  4. How are caching and sharding techniques applicable in game development?
  5. How would you go about designing a file-sharing service like Dropbox?
  6. How would you integrate cloud features in game development?
  7. How would you go about designing a chatbot service?
  8. How would you ensure that your system is secure to end-users?
  9. How would you approach the design of a platform like Instagram?
  10. What scalable features would you consider while designing an e-commerce website?
  11. How would you integrate in-game messaging while designing a 3D game?

Roblox Behavioral Interview Questions

Behavioral interviews are as important as coding and systems design interviews these days. Below are the type of questions you can expect at Roblox’s technical interview:

  1. What is the most challenging project that you’ve worked on to date?
  2. Tell us about a time when you had to shift teams and adapt quickly.
  3. Tell us about a time when a coworker was uncooperative, allowing the project to suffer as a result.
  4. Why do you want to work at Roblox?
  5. How do you ensure to maintain a healthy and robust work-life balance?
  6. How do you deal with stress in your personal and professional life?
  7. What about gaming excites you the most? Are you a gamer?
  8. Tell us about a time when you faced pressure to deliver on a difficult project.

Crafting your responses effectively is key to acing behavioral interviews. To answer behavioral questions in the best possible way, using the STAR method is integral. Find out more by checking our blog piece on How to Answer Situational Interview Questions.

For more behavioral interview questions, check out this comprehensive article on Behavioral Interview Questions For Software Engineers and Developers.

Tips to Crack the Roblox Technical Interview

Here are some useful tips that will help you nail Roblox’s technical interview.

  1. Start your prep early. Give yourself at least 8-10 weeks to prepare for the interview.
  2. Solve a minimum of 1 coding problem a day. Classify problems based on inherent patterns and use these patterns to solve new problems. Employing power patterns is the most effective way to up your problem-solving skills. 
  3. Get familiar with the STAR method to succinctly answer behavioral questions. 
  4. Practice coding on a whiteboard.
  5. Spend at least one or two weeks specifically on distributed systems design. 
  6. Practice mock interviews with industry experts and hiring managers from FAANG+ companies.

Interview Kickstart gives you the opportunity to practice mocks with hiring managers from FAANG+ companies. You can also schedule one-on-one mentor sessions with experts who have 25+ years of industry experience.  

Check out How to Crack the Coding Interview With 2 Months of Prep to get insightful ideas on adopting the ideal prep strategy to nail FAANG and tier-1 companies’ interviews. 

FAQS on Roblox Technical Interview

Q. What coding concepts are important for technical interviews at Roblox and other companies?
There are the coding concepts you should prepare for technical interviews at top companies: Arrays, strings, linked lists, recursion, sorting, hash tables, trees, graphs, and dynamic programming.

Q. What systems design concepts are important for Roblox’s technical interview?
The following concepts in distributed systems design are essential for Roblox’s technical interview: Network protocols, sharding techniques, databases, caching, API modeling, and concurrency.

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