Zillious Interview Questions (2026)
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Zillious Interview Experience | Set 3 (On-Campus)
Question Details
Zillious came to our campus on 28 th October 2015 for recruitment. Round 1 was held at our college premises and the rest of the process at their office. The result was declared after four days. In total 3 students got placed in the company.
Round 1 Written Round It consisted of 20 MCQ questions to be answered in 30 minutes. Questions were based on Time and Work, Logical Reasoning, Operating System, Computer Networks, Digital Logic and Computer Design (Count the no. of 1 bits in the binary representation of 34096 + 15256 +.. something type question). And after that 2 coding questions were given which were meant to be written on paper within 1 hour. Coding Questions:- There are many frogs in the Bob’s garden. Frog F is initially at position (0, 0) and wants to communicate with some other frog. This frog F can move in only two ways: Turn to its left and move forward. Turn to its right and move forward. Write a function that takes coordinate (x, y) as input and calculate the minimum no. of moves that the frog would make to reach the destination. Assume the frog is always initially at position (0, 0). Find longest palindromic substring:
Example:
INPUT: ZILLIOUSOUILZIL OUTPUT: LIOUSOUIL
Round 2 Face to face technical round 8 students were shortlisted. Puzzle 1: 3 types of employees are there: TYPE A: always speaks truth, and says that he has 6 legs TYPE B: always speaks a lie, and says that he has 7 legs TYPE C: always speaks truth, and says that he has 8 legs Now there are 4 employees named W, X, Y, Z W says: in all we have 24 legs. X says: in all we have 27 legs. Y says: in all we have 28 legs. Z says: in all we have 30 legs. Ques. 1. Which one of them is speaking lie? Ques. 2. Which one of them is speaking truth? Puzzle 2: There are n seats in an airplane. All seats are booked. Now one of the n passengers loses his ticket. He goes and sits on any random seat. The passengers with tickets enter the airplane, and sit on their seat if they find it empty otherwise they sit on any random seat. What is the probability that nth passenger sits on his seat. This was a coding question. You have an array of integers. Find the first pair of integers whose sum is equal to k. I gave a pruned tree solution but the time complexity was O(n)^2. The interviewer was expecting me to improve on the basis of time complexity but I couldn’t. There is an array whose configuration is as follows a[0….k-1, k, k+1…..n-1], where a[0], a[1], a[2], ……a[k-1] < a[k] < a[k+1], a[k+2], …… a[n-1]. [Hint]: Find k in O(n) and memory is not an issue. Round 3 5 students were shortlisted from the previous round. All of us were given a question to be coded. It was based on Dynamic Programming. We were given 1 hr. Here is the problem. Ques. Let us define a multiplication operation(×) on three symbols a; b; c according to the following table: Therefore, a × a = b , a × b = b etc. Find an efficient algorithm that examines a string of these symbols, say bbbbac, and decides whether or not it is possible to parenthesize the string in such a way that the value of the resulting expression is a. For example, on input bbbbac your algorithm should return yes because ((b(bb))(ba))c = a. Source: https://stackoverflow.com/questions/8652447/parenthesizing-a-string-so-that-expression-takes-a-given-value 3 students were shortlisted based on the performance in this round and I was not one of them. All Practice Problems for Zillious !
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Zillious Interview Process Overview
The Zillious interview process typically includes a recruiter screen, one to two technical phone screens, and a 4-6 round on-site or virtual on-site loop. Each round serves a distinct calibration purpose: coding rounds measure correctness, code quality, and complexity reasoning; system design rounds measure architectural judgment at the appropriate level; behavioral rounds measure ownership, leadership scope, and collaboration. Reports tagged on LeakCode from 2024-2026 show Zillious runs a calibrated process consistent with industry norms for companies of its tier.
Difficulty calibration: Zillious coding rounds typically run medium difficulty with follow-up depth as the senior discriminator. System design rounds expect production-grade trade-off articulation at L4+ levels. Behavioral rounds expect quantified outcomes ("reduced p99 latency from 800ms to 120ms") rather than vague impact claims. The candidates who advance consistently demonstrate clear thinking out loud rather than perfect final answers.
How To Use Zillious Question Reports
Real candidate-reported interview questions are a calibration tool, not a memorization target. Zillious updates its question pool every 2-4 months; memorizing exact problems risks misleading you when the interviewer uses a variant. The high-leverage approach: identify the patterns that appear repeatedly in Zillious reports, practice those patterns on similar (not identical) problems, and use the reports to understand the interviewer's typical follow-up depth.
Filter the questions above by round type, difficulty, and recency. Focus first on reports from the past 6-12 months; older reports may reference questions that have since rotated out of Zillious's pool. Reports tagged with quantified difficulty and explicit round type are higher-signal than reports without those tags. The metadata filters help you build a focused study plan in 1-2 hours rather than 8-10 hours of unstructured browsing.
Common Zillious Interview Mistakes
Reports tagged "no hire" at Zillious consistently surface a few patterns: jumping into code without clarifying requirements, coding silently for extended periods, missing edge cases (empty input, single element, large input, overflow), producing working code the candidate cannot refactor when probed, and behavioral stories that use "we" instead of "I" diluting individual signal. Strong candidates explicitly avoid these patterns by following a consistent round template.
The single most predictive failure mode in recent reports: not asking clarifying questions. Interviewers are explicitly trained to weight this dimension. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into implementation immediately. Strong candidates also verbalize their approach before writing code; weak candidates code in silence and lose the communication dimension of the round's calibration.