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Updated weekly · Last refresh Oct 17

CARD91 Software Engineer Interview Questions

The questions to prepare for a CARD91 Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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CodingStart here. 6 questions · ~50 min

Analyze Algorithm Time and SpaceEasy

Explain how to derive time and space complexity for a coding solution, including loops, recursion, and auxiliary memory.

Hash TablesArraysSearchingCCARD91

DSA, OOP, Patterns, ArchitectureMedium

Evaluates your ability to connect core CS concepts to practical software design decisions.

design patternsoopCCARD91

Analyze Sorting ComplexityMedium

Assesses algorithmic reasoning and complexity analysis for selecting the right sorting strategy.

CCARD91

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SQL & Data Manipulation3 questions + 3 drills · ~55 min

Understanding Database Indexing PurposeMedium

Explain the purpose of using indexes in databases and their impact on query performance.

CCARD91

Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityCCARD91

Customer Orders: LEFT vs INNER JOINEasy

Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.

JoinsData WranglingGroup ByCCARD91

Java Core Concepts and SQL BasicsMedium

Practice

Practice drill

Explain core Java concepts and produce an aggregated SQL access summary using joins.

javaJoinssql

Saviynt

Core Java and Spring MicroservicesMedium

Practice

Practice drill

Return cardholders whose 2025 approved transaction total is at least 1000 across multiple transaction records.

javaJoinssql

Mastercard

Java and SQL BasicsEasy

Practice

Practice drill

Use SQL to identify active engineers with both Java and SQL experience and report their experience levels.

javaJoinsCase When

General Dynamics Information Technology

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Technical Fundamentals4 questions · ~33 min

Applying OOP Concepts DailyMedium

Tests your ability to apply OOP principles in real software design and implementation.

coding practicessoftware engineeringoopCCARD91

Java == vs .equals()Medium

Tests your Java fundamentals around equality, object identity, and correctness.

javaCCARD91

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