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Updated weekly · Last refresh Sep 23
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ZScalar QA Engineer Interview Questions

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

33questions
~5htotal time
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1
CodingStart here. 12 questions · ~117 min
TCP/IP, Ports, and Packet FlowMedium

Evaluates understanding of TCP/IP, port usage, and packet routing behavior.

NetworkingZZScalar
Linked List CodingMedium

Evaluates linked list implementation skills and correctness reasoning.

CodingData StructuresZZScalar
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2
Technical Fundamentals5 questions · ~49 min
Computer Networks FundamentalsMedium

Assesses depth of computer networking knowledge and practical troubleshooting thinking.

fundamentalsNetworkingOperating SystemsZZScalar
Troubleshoot Distributed Connection IssuesMedium

Evaluates systematic debugging skills for distributed connectivity problems.

Networkingdistributed systemsTroubleshootingZZScalar
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3
Security & Infrastructure3 questions · ~29 min
OSI Model Real-Time ApplicationsMedium

Assesses understanding of how the OSI model applies to practical systems.

NetworkingZZScalar
TCP/IP Handshake and SecurityMedium

Assesses understanding of TCP/IP behavior and security implications.

network securityZZScalar
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4
Behavioral & Leadership11 questions · ~107 min
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5
More topics2 questions · ~19 min
Interview Scope and DifficultyHard

Evaluates resilience and problem-solving when facing wide-ranging technical questions.

ProgrammingsqlZZScalar
SQL Keys, Schema, and DeadlocksHard

Tests SQL fundamentals and ability to reason about concurrency issues.

sql queriesData StructuresAlgorithmsZZScalar
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

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

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Calculate 30-Day User RetentionHard
Practice
Practice drill

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsCurefitIndeedTikTok
Find Employee With Max SalaryMedium
Practice
Practice drill

Use MAX, a scalar subquery, and a LEFT JOIN to identify Zscaler employees with the highest salary.

sql querysalaryZscalerZZScalar
The finish line: interview-readyComplete all 33 questions plus 3 hands-on drills to finish this plan.