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Updated weekly · Last refresh Aug 30

Klaviyo Software Engineer Interview Questions

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

50questions
~7htotal time
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1
CodingStart here. 12 questions · ~106 min
Valid Palindrome String CheckEasy
Practice
Recently asked

Check whether a string is a palindrome using two pointers while ignoring case and non-alphanumeric characters.

Hash TablesStringsTwo PointersKlaviyo
Linked List ReversalEasy
Practice
Recently asked

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysKlaviyo
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2
Execution11 questions · ~97 min
Design an API Under ConstraintsMedium
Recently asked

Design an API by balancing usability, performance, versioning, and operational risk under real product constraints.

Trade-offsRisk AssessmentScope ManagementKlaviyo
Design a Production Rollback PlanMedium
Recently asked

Design a rollback plan for a failed production deployment, including triggers, ownership, validation, and safe recovery steps.

Rollback PlanSuccess CriteriaRisk AssessmentKlaviyo
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3
SQL & Data Manipulation9 questions + 3 drills · ~109 min
Analyzing Customer Behavior DataMedium
Recently asked

Tests your ability to analyze customer behavior data to drive insights for Klaviyo’s B2C CRM.

Data WranglingGroup ByAggregationsKlaviyo
Top 10 Customers SQLEasy
Practice
Practice drill

Use SUM, GROUP BY, ORDER BY, and LIMIT to find the top 10 Healthfirst Marketplace customers by purchase total.

RankingGroup ByAggregationsBBusiness Integration Partners (BIP)RANDHealthfirst (New York)
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 TotalsMetaSpotifyMeta IT
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
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4
System Design11 questions · ~97 min
Major System Design WalkthroughHard

Tests end-to-end system design depth and ability to justify trade-offs.

system architectureimplementationKlaviyo
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5
Security & Infrastructure3 questions · ~26 min
Linux Log StorageEasy

Evaluates baseline Linux knowledge around logging locations and practices.

linuxKlaviyo
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6
Behavioral & Leadership3 questions · ~26 min
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7
More topics1 question · ~9 min
Event-Driven Architecture PrinciplesMedium
Recently asked

Tests your understanding of event-driven design for building reliable pipelines and integrations.

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