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Prep plan

Updated weekly · Last refresh Oct 17

Zscaler Software Engineer Interview Questions

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

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CodingStart here. 11 questions · ~132 min

LFU Cache DesignHard

Practice

Implement an LFU cache with constant-time get and put operations using frequency buckets and recency ordering.

cachingAlgorithmscache

Zscaler

Longest Mountain in ArrayMedium

Practice

Find the longest strict increase-then-decrease subarray using a linear two-pointer scan.

ArraysArray ManipulationAlgorithms

Zscaler

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Security & Infrastructure10 questions · ~120 min

Remote Browser Isolation and Zero TrustMedium

Explain how Zscaler RBI and zero trust protect users, then compare their security boundaries with traditional VPN access.

identity managementnetwork securityaccess management

Zscaler

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System Design10 questions · ~120 min

Low-Level Ticket Booking System DesignHard

Design an extensible BookMyShow-style booking system using SOLID principles and suitable design patterns.

booking logicclass structurearchitecture patterns

Zscaler

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SQL & Data Manipulation4 questions + 2 drills · ~68 min

Transactions in Data SystemsMedium

Practice

Summarize transaction duration and failed requests to support reasoning about concurrent database operations.

deadlockstransactionsACID

Zscaler

SQL Window Query for Geo LoginsHard

Practice

Practice drill

Use joins and LAG to identify users with consecutive logins from different locations within 10 minutes.

Window FunctionsLag/LeadJoins

Zscaler

Second Highest Trader SalaryEasy

Practice

Practice drill

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

SubqueriesRankingSorting

eClinicalWorksNNeenOpal Canada

Informatica

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Technical Fundamentals10 questions · ~120 min

TCP vs UDP and HandshakeMedium

Evaluates understanding of transport protocols and network performance concepts.

Networking

Zscaler

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Behavioral & Leadership3 questions · ~36 min

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