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Top 29
Prep plan
Updated weekly · Last refresh Aug 30

Factored Software Engineer Interview Questions

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

29questions
~5htotal time
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1
CodingStart here. 9 questions · ~90 min
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersFactored
Two Sum with TargetEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsFactored
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2
System Design3 questions · ~30 min
Design a URL Shortening ServiceHard

Design a URL shortening service that routes, ranks, and monitors links at scale.

Feature StoreModel ServingFactored
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingFactored
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3
Execution8 questions · ~80 min
Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope ManagementFactored
Scalable Backend Engineering ApproachMedium

Tests backend architecture thinking, engineering process, and maintainable system design.

Trade-offsRisk AssessmentScope ManagementFactored
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4
Behavioral & Leadership7 questions · ~70 min
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5
More topics2 questions · ~20 min
SQL Query Optimization ApproachMedium

Tests structured thinking for diagnosing and improving SQL query performance.

JoinsAggregationsFactored
E-commerce Database Schema DesignMedium

Tests data modeling skills for e-commerce workloads, including normalization, indexing, and constraints.

JoinsData WranglingGroup ByFactored
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Sales RevenueEasy
Practice
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
Find Duplicates in SQLEasy
Practice
Practice drill

Use GROUP BY and HAVING to find duplicate policy records in Ryan Specialty data.

Group ByHavingAggregationsGramenerCarGurusFactored
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
The finish line: interview-readyComplete all 29 questions plus 3 hands-on drills to finish this plan.