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Updated weekly · Last refresh Oct 17

TikTok Data Engineer Interview Questions

The questions to prepare for a TikTok Data Engineer interview. Questions from real interview reports rank first. Updated daily.

24questions
~5htotal time
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1
SQL & Data ManipulationStart here. 7 questions · ~90 min
SQL vs NoSQL DifferencesEasy
Practice
Recently asked

Compare core SQL and NoSQL database characteristics using a PostgreSQL result set.

nosqlsqlACIDTikTok
Top Creators Rolling 30 DaysMedium
Practice
Recently asked

Rank TikTok creators by engagement rate over a rolling 30-day window using joins, aggregation, and a ranking function.

Date FunctionsJoinsperformanceTikTok
Clustered vs Non-Clustered IndexingMedium
Practice
Recently asked

Classify PostgreSQL indexes and explain how physical clustering and access methods affect TikTok query performance.

database optimizationindexingperformanceTikTok
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2
Coding5 questions · ~64 min
Longest Substring Without RepeatsMedium
Practice
Recently asked

Find the longest substring without repeated characters using a sliding window and hash set.

deduplicationArrayssqlTikTok
Array or String LeetCode ProblemMedium
Practice
Recently asked

Find the longest substring without duplicate characters using a sliding window and last-seen index map.

CodingArraysStringsTikTok
Rate Limiting for API PipelinesHard
Practice
Recently asked

Implement a per-client sliding-window rate limiter for TikTok API requests.

apiperformanceData StructuresTikTok
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3
Pipelines8 questions · ~103 min
XGBoost OverviewHard
Recently asked

Explain XGBoost, its gradient boosting architecture, and how to productionize its training data pipeline.

Data Qualitydata pipelineMachine LearningTikTok
End-to-End Real-Time Logs PipelineHard
Recently asked

Design a reliable, low-latency TikTok pipeline for ingesting, processing, validating, storing, and serving real-time user activity logs.

system designdata pipelinekafkaTikTok
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4
Behavioral & Leadership4 questions · ~51 min
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The finish line: interview-readyComplete all 24 questions to finish this plan.