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Updated weekly · Last refresh Oct 17

TikTok Backend Engineer Interview Questions

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

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1
CodingStart here. 6 questions · ~48 min
Binary Search Tree AlgorithmMedium
Recently asked

Tests your fundamentals for tree-based algorithms and ability to reason about correctness and complexity.

leetcodeTikTok
Use AI to Implement CodeMedium
Recently asked

Assesses practical use of AI in development and your approach to correctness and verification.

AIimplementationTikTok
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2
System Design3 questions · ~24 min
System Design: Vending MachineMedium
Recently asked

Assesses core system design skills for state, inventory, and transactions.

designTikTok
Design URL Shortening or NotificationsHard
Recently asked

Tests system design fundamentals across scalability, reliability, and API/service boundaries.

system designnotification systemTikTok
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3
Behavioral & Leadership3 questions · ~24 min
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4
More topics6 questions · ~48 min
SQL vs NoSQL Trade-offsEasy
Recently asked

Explain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.

JoinsData WranglingAggregationsTikTok
Backend Rendering and ErrorsMedium
Recently asked

Tests reliability and resilience practices for backend request handling and failure modes.

error handlingTikTok
Thread Safety and LocksHard
Recently asked

Evaluates concurrency control knowledge and correctness under parallel execution.

thread safetyTikTok
Database Sharding and SyncHard
Recently asked

Evaluates data partitioning and consistency strategies in distributed backend systems.

synchronizationdistributed systemsTikTok
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Scenario-Based Business CaseHard
Practice
Recently asked
Practice drill

Aggregate project outcomes and present a defensible SQL-based business case analysis.

project experienceJoinsbusiness problemTikTok
Bids by Available LotsEasy
Practice
Recently asked
Practice drill

Use a left join and aggregation to count bids for every available lot, including lots with zero bids.

JoinsGroup BysqlByteDanceTikTok
Your Data ProjectMedium
Practice
Recently asked
Practice drill

Use joins, aggregation, and a CTE to identify TikTok Shop sellers with at least two completed orders.

experienceJoinsData ManipulationTikTokTikTok Shop
The finish line: interview-readyComplete all 18 questions plus 3 hands-on drills to finish this plan.