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Updated weekly · Last refresh Aug 30

Thumbtack Software Engineer Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 27 questions · ~234 min
Prefix Notation Expression EvaluationEasy
Practice

Evaluate a postfix expression of variables and operators using a stack, as used in Thumbtack quote calculations.

Thumbtack
Serialize and Deserialize Binary TreeMedium
Practice

Serialize a binary tree to a string and reconstruct it exactly using preorder traversal with null markers.

RecursionHash TablesQueueThumbtack
Calendar Scheduling Without ConflictsMedium

Tests your ability to design a scheduling system with conflict detection and full CRUD operations.

abstractionData StructuresoopThumbtack
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2
System Design12 questions · ~104 min
Local Pro Search and DiscoveryHard

Tests your ability to design a scalable search system with ranking signals and geo-aware filtering.

ML RankingFeature StoreRetrievalThumbtack
Real-Time Lead MatchingHard

Tests system design for low-latency matching and availability-aware routing of leads to pros.

Feature StoreRetrievalRecommendation SystemsThumbtack
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3
Behavioral & Leadership8 questions · ~69 min
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4
More topics3 questions · ~26 min
High-Scale Notification DeliveryHard

Tests your ability to design reliable, rate-limited notification pipelines at very high scale.

Stream ProcessingmonitoringOrchestrationThumbtack
Analyze a Small SQL TriggerMedium

Assesses your SQL fluency and ability to reason about side effects in database triggers.

code analysissqlThumbtack
Token Frequency CountingEasy

Assesses your ability to implement efficient frequency counting with common data structures.

Data AnalysisThumbtack
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Retention Over Six MonthsHard
Practice
Practice drill

Calculate six-month Thumbtack professional retention using CTEs, date filtering, joins, and cohort aggregation.

sql queryData AnalysisThumbtack
SQL for MoM RetentionHard
Practice
Practice drill

Calculate cohort month-over-month retention for Thumbtack service professionals using CTEs, date truncation, joins, and aggregation.

Window FunctionsDate FunctionsRetentionThumbtack
Sum From 1 to 1,000,000Easy
Practice
Practice drill

Calculate the sum of integers from 1 to 1,000,000 using PostgreSQL aggregation and filtering.

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