# Software Engineer
**Role:** Software Engineer · **Level:** P2
**Company:** [Riot Games](https://scaleengineer.com/companies/riot-games)
**Difficulty:** Medium to Hard
**Salary:** US$110000 - US$150000
**Experience:** 2 - 5
**Timeline:** ~14 days
This interview process is for a Software Engineer (P2 level) at Riot Games, focusing on assessing technical skills, problem-solving abilities, and cultural fit within the company.
Canonical: https://scaleengineer.com/interviews/riot-games/p2-software-engineer
---
## Overall evaluation

- Technical Skills
- Communication
- Cultural Fit

## Questions asked

- Tell me about a challenging technical problem you faced and how you solved it.
- Describe a time you had to work with a difficult team member. How did you handle it?
- How would you design a system to handle millions of concurrent users for an online game?
- What are your thoughts on test-driven development (TDD)?
- Explain the difference between a process and a thread.
- How do you stay updated with the latest technologies in software development?
- What are your favorite features in our games, and why?
- If you were given a feature request that seemed technically infeasible, how would you approach it?
- Describe a situation where you had to mentor a junior engineer.
- What are the trade-offs of using a microservices architecture?

## Preparation tips

### lists

- Review fundamental computer science concepts: data structures, algorithms, operating systems, databases.
- Practice coding problems on platforms like LeetCode, HackerRank, or Coderbyte, focusing on medium to hard difficulty.
- Study system design principles and common architectural patterns.
- Prepare for behavioral questions using the STAR method (Situation, Task, Action, Result).
- Research Riot Games' values, mission, and recent projects.
- Understand the specific technologies and languages mentioned in the job description.
- Prepare questions to ask the interviewer about the role, team, and company culture.

### studyPlan

- {"title":"Data Structures and Algorithms Fundamentals","longDescription":"Weeks 1-2: Focus on core data structures (arrays, linked lists, trees, graphs, hash maps) and algorithms (sorting, searching, dynamic programming, graph traversal). Practice implementing these from scratch and analyze their time and space complexity. Solve 10-15 medium-difficulty problems per week.","shortDescription":"Weeks 1-2: Data Structures & Algorithms (Core Concepts). Solve 10-15 medium problems/week."}
- {"title":"System Design and Architecture","longDescription":"Weeks 3-4: Dive into system design. Study concepts like scalability, availability, reliability, load balancing, caching, databases (SQL vs. NoSQL), and API design. Work through common system design interview questions and practice sketching out architectures.","shortDescription":"Weeks 3-4: System Design Principles. Study scalability, databases, APIs. Practice common design questions."}
- {"title":"Behavioral and Situational Preparation","longDescription":"Week 5: Prepare for behavioral and situational questions. Reflect on past projects and experiences, identifying examples that demonstrate leadership, teamwork, problem-solving, and handling conflict. Practice articulating these using the STAR method.","shortDescription":"Week 5: Behavioral & Situational Questions. Prepare STAR method examples."}
- {"title":"Mock Interviews and Company Alignment","longDescription":"Week 6: Mock interviews. Conduct mock interviews with peers or mentors, focusing on both technical and behavioral aspects. Get feedback on your communication, problem-solving approach, and overall presentation. Review Riot Games' specific values and prepare to align your answers with them.","shortDescription":"Week 6: Mock Interviews & Company Research. Practice with peers. Research Riot's values."}

## Location differences

- {"location":"Los Angeles, USA","differences":{"tips":["Research Riot's specific tech stack and infrastructure.","Be prepared to discuss your experience with high-availability systems.","Highlight any experience with real-time communication protocols.","Emphasize your understanding of game development lifecycles and challenges."],"interviewFocus":["Understanding of distributed systems and scalability, especially in the context of live services.","Experience with performance optimization and profiling.","Familiarity with cloud technologies (AWS, Azure, GCP) and containerization (Docker, Kubernetes).","Ability to work with large-scale data and databases."],"commonQuestions":["How would you handle a sudden surge in player traffic on a game server?","Describe a time you had to optimize a piece of code for performance. What was the outcome?","What are your thoughts on microservices vs. monolithic architecture for a game backend?","Tell me about a challenging bug you encountered and how you debugged it."]}}
- {"location":"Dublin, Ireland","differences":{"tips":["Showcase your ability to communicate technical concepts clearly.","Be ready to discuss your contributions to team projects.","Highlight any experience with CI/CD pipelines.","Demonstrate a passion for gaming and Riot's products."],"interviewFocus":["Strong understanding of software design patterns and principles.","Experience with agile development methodologies.","Ability to collaborate effectively with cross-functional teams (designers, producers, QA).","Problem-solving skills and logical thinking."],"commonQuestions":["How do you ensure code quality and maintainability in a collaborative environment?","Describe a project where you had to make significant architectural decisions. What was your thought process?","What are your preferred methods for testing software, especially in a live environment?","How do you approach learning new technologies or programming languages?"]}}
- {"location":"Singapore","differences":{"tips":["Brush up on common algorithms and data structures.","Practice explaining your thought process for problem-solving.","Be prepared to discuss your favorite games and why.","Showcase your enthusiasm for Riot's mission and values."],"interviewFocus":["Deep understanding of data structures and algorithms.","Proficiency in at least one major programming language (e.g., C++, C#, Java, Python).","Experience with system design and architecture.","Behavioral questions assessing teamwork and communication."],"commonQuestions":["How would you design a matchmaking system for a competitive online game?","Discuss your experience with data structures and algorithms. Provide examples of how you've applied them.","What are the trade-offs between different database technologies (SQL vs. NoSQL) for game data?","Tell me about a time you disagreed with a technical decision and how you handled it."]}}

## Round 1: Coding and Algorithms Assessment
**Type:** Technical Coding Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess core coding skills and problem-solving abilities with data structures and algorithms.
This initial technical round focuses on your core programming skills. You will be asked to solve one or two coding problems, typically involving data structures and algorithms. The interviewer will assess your ability to write clean, efficient, and correct code, as well as your approach to problem-solving and your ability to communicate your thought process effectively.
**Interviewers look for:** Clean, efficient, and correct code.; Logical and structured approach to problem-solving.; Ability to explain their reasoning.; Understanding of time and space complexity.
**Evaluation criteria:** Coding proficiency; Problem-solving approach; Understanding of data structures and algorithms; Communication of thought process
**Common rejection reasons:** Inability to articulate thought process clearly.; Lack of fundamental programming knowledge.; Poor problem-solving approach.; Not demonstrating sufficient coding proficiency.
## Questions

- Given an array of integers, find the contiguous subarray with the largest sum.
- Implement a function to reverse a linked list.
- Find the kth smallest element in a binary search tree.

## Preparation tips

- Practice coding problems on a whiteboard or in a shared editor.
- Focus on explaining your approach before you start coding.
- Test your code with edge cases.
- Be prepared to discuss the time and space complexity of your solutions.

## Round 2: System Design and Architecture
**Type:** System Design Interview · **Difficulty:** Hard · **Duration:** 60 min
Assess your ability to design scalable and robust software systems.
This round evaluates your ability to design and architect complex systems. You'll be presented with a high-level problem (e.g., design a social media feed, a URL shortener, or a game matchmaking system) and expected to propose a scalable and robust solution. The focus is on your understanding of distributed systems, databases, caching, load balancing, and your ability to articulate design trade-offs.
**Interviewers look for:** Ability to design scalable and reliable systems.; Understanding of various architectural patterns.; Sound judgment in making design decisions and trade-offs.; Clear explanation of design choices and reasoning.
**Evaluation criteria:** System design and architecture; Scalability and performance; Trade-off analysis; Understanding of distributed systems; Communication of design choices
**Common rejection reasons:** Lack of understanding of system design principles.; Inability to handle scale and performance considerations.; Poor trade-off analysis.; Difficulty in designing robust and maintainable systems.
## Questions

- Design a system for a real-time chat application.
- How would you design a rate limiter for an API?
- Design a distributed cache system.

## Preparation tips

- Study common system design patterns and principles.
- Practice designing systems for scale.
- Be prepared to discuss databases, caching strategies, and API design.
- Think about potential bottlenecks and how to address them.

## Round 3: Behavioral and Managerial Fit
**Type:** Behavioral and Managerial Interview · **Difficulty:** Medium · **Duration:** 45 min
Assess behavioral competencies, teamwork, and cultural fit with Riot Games.
This round focuses on your behavioral and situational responses, as well as your overall fit with Riot Games' culture. The hiring manager will ask questions about your past experiences, how you handle challenges, your teamwork abilities, and your motivations for joining Riot. They will also assess your passion for gaming and your understanding of Riot's values.
**Interviewers look for:** Ability to work effectively in a team.; Clear and concise communication.; Proactive problem-solving.; Enthusiasm for Riot's mission and games.; Alignment with Riot's core values.
**Evaluation criteria:** Teamwork and collaboration; Communication skills; Problem-solving approach; Adaptability and learning; Cultural fit with Riot Games
**Common rejection reasons:** Lack of collaboration or teamwork skills.; Poor communication or interpersonal skills.; Inability to handle constructive feedback.; Not aligning with Riot's values or culture.; Lack of passion for gaming or Riot's products.
## Questions

- Tell me about a time you failed. What did you learn from it?
- Describe a project where you had to collaborate with people from different disciplines. How did you ensure effective communication?
- What are your career goals, and how does this role at Riot fit into them?
- How do you handle constructive criticism?

## Preparation tips

- Prepare examples using the STAR method for common behavioral questions.
- Research Riot Games' values and culture.
- Think about why you want to work at Riot and what excites you about the role.
- Be enthusiastic and genuine in your responses.