Top 50
Prep plan
Updated weekly · Last refresh Aug 30

Discord Software Engineer Interview Questions

The questions to prepare for a Discord Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~8htotal time
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1
CodingStart here. 26 questions · ~244 min
Discord DTLS Buffer ProcessingHard
Practice

Fragment and pack ordered DTLS messages into minimum-size buffers while accounting for per-fragment record overhead.

Discord
DFS Character Mapping ExplorationHard
Practice

Use DFS backtracking to enumerate every bijective character-to-substring mapping that reconstructs a Discord message.

Discord
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2
System Design8 questions · ~75 min
Game Matchmaking DesignHard

Evaluates your ability to design scalable matchmaking logic with latency and fairness constraints.

system designperformanceDiscord
Scaling Message StorageMedium

Assesses your system design judgment for high-scale message storage, indexing, and modeling trade-offs.

indexingdatabase designData ModelingDiscord
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3
Execution3 questions · ~28 min
Production CPU Spike IncidentMedium

Tests your incident response process using logs and metrics to identify and explain a root cause.

performanceDebuggingincident responseDiscord
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4
Behavioral & Leadership7 questions · ~66 min
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5
More topics6 questions · ~56 min
JSON Parsing and AggregationMedium

Tests data manipulation skills and correctness in parsing and aggregation.

json parsingstatisticsDiscord
Sessionization in Event StreamsMedium

Evaluates your ability to model session boundaries and implement correct sessionization logic.

Discord
C++ Memory Alignment IssuesMedium

Assesses your understanding of low-level memory layout and its impact on correctness and performance.

memory managementc++Discord
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.