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Updated weekly · Last refresh Aug 16

Slack Software Engineer Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 3 drills · ~54 min
SQL Multi-Table Query ProcessingMedium
Recently asked

Tests ability to write and process multi-table SQL results programmatically.

data processingsql queriesSlack
Aggregate Channel Engagement MetricsMedium
Recently asked

Assesses skill in querying and aggregating event data into engagement metrics.

sql querySlack
7-Day Rolling Active UsersMedium
Practice
Practice drill

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsMetaSpotifyXYZ
Time From Trial to First PaidMedium
Practice
Practice drill

Use CTEs and joins to calculate the time from each user's first trial signup to first paid transaction.

sql queriesAdobe
Compute Session Durations and GapsMedium
Practice
Practice drill

Use window functions to calculate session length and flag user session gaps over 30 minutes.

sql queriesAdobe
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2
System Design14 questions · ~112 min
Design DM Backend With Offline SyncHard
Recently asked

Evaluates backend architecture for DMs with persistence and offline synchronization.

scalable architectureoffline syncSlack
Design Slack-Scale Autocomplete APIHard
Recently asked

Assesses system design for low-latency suggestions under high concurrency in Slack-like chat.

api designreal-time systemsSlack
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3
Coding15 questions · ~120 min
Format and Filter Active Users by RoleMedium
Recently asked

Tests ability to implement correct filtering and formatting logic driven by role permissions.

apiSlack
Parse and Extract Alphanumeric PatternsMedium
Recently asked

Assesses ability to design efficient parsing logic for pattern counting and extraction.

string manipulationSlack
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4
Execution13 questions · ~104 min
Take Over an Undocumented APIHard

Tests execution and troubleshooting strategy for inheriting an API with missing observability.

TroubleshootingSlack
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5
Behavioral & Leadership4 questions · ~32 min
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6
More topics1 question · ~8 min
Incident Response ExperienceMedium

Assesses operational readiness and experience handling production incidents.

experienceincident responseSlack
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.