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Quantiphi Software Engineer Interview Questions

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

50questions
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1
CodingStart here. 16 questions · ~165 min
Palindrome and String ReversalEasy
Practice
Recently asked

Determine whether a string is a palindrome and return its reversed form using two-pointer string processing.

string manipulationQuantiphi
First Non-Repeating CharacterEasy
Practice
Recently asked

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingQuantiphi
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2
SQL & Data Manipulation15 questions + 2 drills · ~175 min
Second-Last Salary EmployeeMedium
Practice

Find every Quantiphi employee tied at the second-highest distinct salary using DENSE_RANK and a department join.

aggregationsqlQuantiphi
Indexes for Query PerformanceMedium
Recently asked

Assesses understanding of indexing strategies and their impact on query execution.

indexesQuantiphi
SQL Query for Max SalaryEasy
Practice
Practice drill

Use PostgreSQL MAX aggregation to identify the highest employee salary for Quantiphi workforce reporting.

sqlQuantiphi
Average Revenue Per User SQLMedium
Practice
Practice drill

Calculate average revenue per user with a LEFT JOIN, CTE, date filter, and NULL-safe aggregation.

Data AnalysissqlQuantiphi
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3
Execution4 questions · ~41 min
Design a Cab Company GuesstimateHard

Tests your structured problem solving and estimation approach for a real business scenario.

case studyQuantiphi
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4
System Design5 questions · ~52 min
Recommendation Engine at AmazonHard

Assesses your ability to explain recommendation systems at a high level.

Recommendation SystemsQuantiphi
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5
Security & Infrastructure5 questions · ~52 min
Lambda Memory ManagementMedium

Assesses understanding of serverless runtime behavior and resource constraints.

memory managementQuantiphi
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6
Behavioral & Leadership4 questions · ~41 min
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7
More topics1 question · ~10 min
Scenario-Based Database DesignMedium

Evaluates your ability to model data and choose structures for a given problem.

scenario analysisdatabase designQuantiphi
The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.