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Updated weekly · Last refresh Aug 30

Thunes Software Engineer Interview Questions

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

33questions
~4htotal time
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1
CodingStart here. 3 questions · ~24 min
Golang Concurrency and RacesMedium

Tests understanding of Go concurrency primitives and race avoidance in production code.

goconcurrencyrace conditionsThunes
Building APIs in GoMedium

Tests practical Go API implementation skills relevant to Thunes backend development.

APIsgoFrameworksThunes
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2
Execution7 questions · ~56 min
Securing Public APIsMedium

Tests API security fundamentals, threat modeling, and mitigations for Thunes endpoints.

rest apisCloud Security RisksSecurityThunes
Design Mobile Wallet APIHard

Tests API design skills for Thunes mobile wallet capabilities, including endpoints, models, and operational concerns.

rest apissolution designThunes
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3
Behavioral & Leadership17 questions · ~137 min
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4
More topics6 questions · ~48 min
Build Idempotent Payment API PipelineEasy

Design an idempotent payment API and ETL pipeline that prevents duplicate charges during retries while publishing exactly-once payment events downstream.

InfrastructureIdempotencyQualityThunes
Explain ACID for Card TransactionsEasy

Explain ACID properties and why they protect financial transaction data in card and payments systems.

acid propertiesfinancial datadata integrityThunes
Designing APIs for ScalingHard

Assesses your system design approach for building scalable, reliable APIs in a B2B payments context.

apiscalingThunes
Event-Driven Payment NotificationsHard

Tests event-driven design for reliable asynchronous payment notifications in Thunes systems.

Stream Processingasynchronous workThunes
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Impute Sparse Assessment ScoresHard
Practice
Practice drill

Use CTEs, joins, CASE, and null handling to clean sparse assessment scores and impute missing values per question.

null handlingData Wranglingdata integrityMercor
The finish line: interview-readyComplete all 33 questions plus 3 hands-on drills to finish this plan.