Type · algorithmic
Given a list of game session events (timestamp, user_id, event_type), write a function to find the top K most active users within a given time window. Active users are defined by the number of events they generated.
How to Pass the King Software Engineer Interview in 2026
Enterprise · Software Engineer Interview Guide
Sign up to see ATSHeadquartered in United KingdomInterview language: English
The King DNA (TL;DR)
The 'Play the Most Popular' philosophy at King means they seek individuals who can translate creative ideas into widely engaging game mechanics. Interviewers assess your ability to contribute to titles like Candy Crush Soda Saga, focusing on user experience and iterative design.
The King Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard problems, reasoning about defects, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of King interview outcomes, avoid these common traps:
- Inefficient data structures leading to high time complexity (e.g., iterating through all events for each user).
- Not correctly managing visited nodes, leading to infinite loops or redundant computations.
- Ignoring rate limiting and error handling for external API calls.
- Not handling edge cases like empty input, zero time window, or K being larger than the number of unique users.
Test Yourself: Real King Questions
Three real prompts pulled from our database.
Type · collaboration
STARGame development involves constant iteration between designers and engineers. Describe a time when a creative game design requirement conflicted with technical performance constraints. How did you work with the game designers to find a middle ground that preserved the fun of the mechanic while keeping the game performant on lower-end mobile devices?
Type · ownership
STARAt King, we often deal with legacy codebases powering massive live games like Candy Crush. Tell me about a time you identified a performance bottleneck or a stability issue in a production game service that was not directly assigned to you, and how you navigated the process of implementing a fix while ensuring zero downtime for millions of players.
+ many more questions, signals, and worked examples
Sign up to unlock the full King grading rubric
King Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 13 questions shown
1
Recruiter Screen
1- 1
Type · motivation
What interests you about working at King, and how do you see your skills contributing to our mission of connecting millions of players worldwide through games?
2
Coding Screen
3- 2
Type · algorithmic
Given a list of game session events (timestamp, user_id, event_type), write a function to find the top K most active users within a given time window. Active users are defined by the number of events they generated. - 3
Type · algorithmic
Design a system to detect potential cheating in a simple puzzle game (e.g., identifying impossible moves or abnormally fast completion times). You'll receive a stream of player actions. Return true if cheating is detected, false otherwise. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · architecture
Design a real-time leaderboard system for a popular mobile game like Candy Crush. Consider scalability, low latency updates, and handling millions of concurrent players. - 5
Type · architecture
Design a system to recommend new games or in-game items to players based on their past behavior and preferences. How would you handle cold starts for new players? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
Implement a function that takes a 2D grid representing a game level (e.g., with obstacles and paths) and finds the shortest path from a start point to an end point. Assume movement is only horizontal and vertical. - 7
Type · algorithmic
Given a stream of player actions (e.g., 'move_left', 'jump', 'use_powerup'), design a data structure that can efficiently answer queries about the sequence of actions performed within a given time range, and also support adding new actions. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · ownership
STARAt King, we often deal with legacy codebases powering massive live games like Candy Crush. Tell me about a time you identified a performance bottleneck or a stability issue in a production game service that was not directly assigned to you, and how you navigated the process of implementing a fix while ensuring zero downtime for millions of players. - 9
Type · collaboration
STARGame development involves constant iteration between designers and engineers. Describe a time when a creative game design requirement conflicted with technical performance constraints. How did you work with the game designers to find a middle ground that preserved the fun of the mechanic while keeping the game performant on lower-end mobile devices? - + 1 more questions in this round (sign up to unlock)
Unlock all 13 King questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at King
How King's DNA translates across functions. Pick your role.
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Practice King interviews end-to-end
King Mock Interview
Run a live mock interview with our AI interviewer using King-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for King Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals King interviewers grade on. Reuse them across every behavioral round.
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King Interview Prep Hub
The frameworks behind every King round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
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Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make King interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
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Sample answers
What a strong answer to these King interview questions shows.
Given a list of game session events (timestamp, user_id, event_type), write a function to find the top K most active users within a given time window. Active users are defined by the number of events they generated.
A strong answer shows: Efficient use of hash maps for user event counts.; Appropriate use of a min-heap or sorting to find the top K users.; Clear explanation of time and space complexity.; Robust handling of edge cases..
Game development involves constant iteration between designers and engineers. Describe a time when a creative game design requirement conflicted with technical performance constraints. How did you work with the game designers to find a middle ground that preserved the fun of the mechanic while keeping the game performant on lower-end mobile devices?
A strong answer shows: Empathy for game design goals; Data-driven communication; Collaborative problem solving.
Frequently asked questions
How long does the King interview process take?
Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.
How should I prepare specifically for King?
Focus on three things: (1) the company DNA shown above - what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.
Does this apply to engineering or design roles at King?
The DNA stays the same - what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.
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