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Updated weekly · Last refresh Aug 30

Pennymac Loan Services Software Engineer Interview Questions

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

21questions
~3htotal time
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1
CodingStart here. 5 questions · ~40 min
Validate Nested Data ObjectsMedium

Tests data validation design, correctness, and thorough edge-case testing.

json parsingfunctionsTestingPennymac Loan Services
Array and String Mini ChallengesMedium

Tests core coding fundamentals in data manipulation and basic algorithms.

ArraysStringsData StructuresPennymac Loan Services
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2
SQL & Data Manipulation3 questions + 3 drills · ~54 min
Mortgage Pipeline Database SchemaHard

Tests schema design, relational modeling, and data integrity for a mortgage pipeline.

data integritydimensionsData ModelingPennymac Loan Services
SQL vs NoSQL for Sensitive DataMedium

Tests database selection reasoning for sensitive financial data and operational trade-offs.

financial datatransactionsdata integrityPennymac Loan Services
SQL Duplicate Record DetectionEasy
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Practice drill

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

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
Write a Query for Repeated RowsMedium
Practice
Practice drill

Find repeated Zomato order items using GROUP BY, HAVING, a CTE, and STRING_AGG.

sqldata integrityZomato
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
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3
Behavioral & Leadership9 questions · ~72 min
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4
More topics4 questions · ~32 min
Real-Time Rate Sync DesignHard

Tests distributed systems design for reliable real-time data propagation across services.

Stream ProcessingAPIsDependenciesPennymac Loan Services
Prioritize Competing RequestsHard

Tests prioritization, stakeholder management, and decision-making under capacity constraints.

Stakeholder ManagementPrioritizationResource AllocationPennymac Loan Services
Secure Document Upload PipelineHard

Tests system architecture for secure, asynchronous document ingestion at high scale in a mortgage pipeline.

Stream ProcessingOrchestrationSecurityPennymac Loan Services
Clarify Requirements for Mortgage PipelineMedium

Tests requirements discovery and ability to translate business needs into technical specs.

RoadmappingScope ManagementrequirementsPennymac Loan Services
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.