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Zscaler interview questions

37 questions12 coding2 system design23 behavioral13 freeUpdated

This is every question in the Zscaler guide, in one list: 12 coding problems, 2 system designs and 23 behavioral questions, drawn from what candidates report about Zscaler interviews.

Each row shows the round it comes from and links to the lesson that works through it. 13 are free to read in full. The other 24 are Premium, and here you still see their round, difficulty and topic, so you know what you're walking into.

Open the Zscaler guide Unlock all 37

Zscaler coding interview questions

12 problems, in the order the guide teaches them. The 3 tagged OA are covered in the online assessment lessons. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.

1Range Queries: Sum Over Many IntervalsFreeOAMediumThe Online Assessment
2Tree DP: Maximum-Weight Independent SetFreeOAHardThe Online Assessment
3Combinatorics: Perfect Pairings Modulo a PrimeFreeOAMediumThe Online Assessment
4Premium medium problemCodingMediumBit Manipulation & Search
5Premium easy problemCodingEasyBit Manipulation & Search
6Premium medium problemCodingMediumBit Manipulation & Search
7Premium medium problemCodingMediumBit Manipulation & Search
8Premium easy problemCodingEasySystems C & C++
9Premium medium problemCodingMediumSystems C & C++
10Premium medium problemCodingMediumSystems C & C++
11Windowed threshold alerter: fire once per incidentFreeSystem designMediumDesign a Monitoring and Alerting System
12Premium medium problemSystem designMediumDesign a Multi-Dimensional Rate Limiter

Zscaler system design interview questions

2 designs, each worked end to end in its own lesson, from requirements to the architecture and its trade-offs.

#Question
1Design a Monitoring and Alerting SystemFree
2Design a Multi-Dimensional Rate Limiter (Premium)

A lock means the design is named here and its walkthrough is Premium.

Zscaler behavioral interview questions

23 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.

Why Zscaler and domain fit (3)

#Question
1Why Zscaler?Free
2What do you know about Zscaler and what it builds?Free
3What draws you to the security domain?Free

Projects, ownership, and conflict (3)

#Question
4Walk me through a project you owned end to end.Free
5Tell me about a time you worked through a technical disagreement or conflict.Free
6Tell me about something you own in production and how you carried it when it broke.Free

AI tooling and senior judgment (2)

#Question
7How do you use AI and modern coding tools day to day, and how do you avoid trusting them blindly?Free
8Here is a one-line, underspecified requirement. How would you scope it, estimate it, and choose a stack?Free

Why Zscaler, and the zero-trust mission (3)

All 3 are Premium

Projects and ownership (3)

All 3 are Premium

Conflict and collaboration (3)

All 3 are Premium

Ambiguity and fast execution (3)

All 3 are Premium

The senior cognitive layer (3)

All 3 are Premium

Read the Zscaler behavioral questions

See all 37 Zscaler questions by name

Premium opens the 24 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.

See PremiumStart with the free Zscaler lessons
Common questions

How many questions are in the Zscaler interview guide?

37: 12 coding problems, 2 system designs and 23 behavioral questions. The guide was last updated in November 2026.

Which rounds do these Zscaler interview questions come from?

Of the 12 coding problems, 3 come from the online assessment, 7 from the coding rounds and 2 from the system design lessons. The 2 system designs and 23 behavioral questions come from the system design and behavioral rounds. Every row in the list carries its round, so you can start with the one you have booked.

Which Zscaler interview questions are free?

13 of the 37 are free to read in full, marked Free in the list. The other 24 come with Premium, which also opens all 100 company guides.