Matrix Comsec Interview Experience
Question Details
Written Round : First test was on aptitude and logical thinking . Second test was on c/c++ basics.After clearing both tests,
coding round was taken.Q.1 Print all permutati...
Full Details
Written Round : First test was on aptitude and logical thinking . Second test was on c/c++ basics. After clearing both tests,
coding round was taken. Q.1 Print all permutation of given string . Q.2 sizeof integer without sizeof operator. After clearing written round, there were two technical and one HR round.
Technical Round 1 Q.1 Tell me about yourself. Q.2 They were ask me about my projects. Mostly focus on intern project. Q.3 They asked me one puzzle ( easy one analytical ) Q.4 You are given a memory address and you have to fetch data 32-bit from there. After fetching data you have to mask n-th bit and then store again on given location. They asked me write optimize pseudo code. Q.5 OOPs concept ( mostly abstract class , virtual functions ) Q.6 Hexadecimal to binary conversion . Q.7 sizeof integer without sizeof operator (Without macros) Q.8 compilation phases. Q.9 They asked me to code permutation of given string but without backtracking.
Technical Round 2 Q.1 They again asked me projects. Q.2 Intermediate code generation and preprocessing in compilation(only this two). Q.3 Differences between TCP and UDP . Q.4 Suppose there are three networks and in each three service access points. all three SAP transmit data at same time. How you manage congestion and collision and in which layer (protocol/PDU) Q.5 suppose you type google.com in browser how TCP/IP protocol handle this request.they asked me to explain each step and layer regarding to that. Q.6 ICMP and Https protocol(basic PDU) Q.7 Let assume you have ip address from application layer(DNS translation) , now how Link layer helps to transmit data(They wanted to know ARP protocol). Q.8 Real time application of concurrency. Q.9 You have large number of students and their two test aptitude and programming marks record. you want to sort whole record lexicographically with names with one of test score. they asked me to write complete code . Q.10 Stack using linked list. Q.11 You have Fixed size buffer size 50MB. you store packet of data in buffer but packet of data is variable in size. When you store packet then it should be relpaced by least used packet ( packet whose timestamp is less).so they asked me to code for that. I approached three solutions. 1. Fixed size buffer so i used linked list and linked all packets and structure of linked list store one extra info which is timestamp. 2. First approach is not efficient so they asked to solve again , i use linear probing concept . 3. Second approach suffered from fragmentation because packet is variable size so they asked me to solve again. I used linear probing with least recently used os concept there with queue data structure. they said to me that it was correct.
HR Round Q.1 Why you want to join matrix ? Q.2 My future aspect and vision. Q.3 One scenario related to development in which how i manage modules, they asked me basic HR question etc. Refer interviewBit and learn atleast two core subject throughly.
About This Question
This is a reported interview question from a matrix comsec interview for a swe role (intern level) during the recruiter round reported in 2017.
It covers the following topics: Linked List, Strings, Matrix, Sql, Stack Queue, Recursion, Networking, Os, Queue, Backtracking, Stack .
Difficulty rating: Easy
About Matrix Comsec Interview Reports
This question was reported by a candidate who interviewed at Matrix Comsec. LeakCode aggregates interview reports from 10+ sources, including 1Point3Acres, Glassdoor, LeetCode Discuss, Blind, Reddit, Indeed, and Nowcoder. Each report is translated where necessary, deduplicated against existing entries, and tagged by company, role, round type, and reporting date.
Use this question as one calibration data point, not a memorization target. Companies typically rotate their question pools every 2-4 months; the exact wording of a 2024 question may differ from what you encounter today. The underlying pattern, difficulty level, and follow-up depth at Matrix Comsec are the higher-signal extractions to take from this report.
For broader preparation context, the Matrix Comsec interview process typically includes a recruiter screen, one or two technical phone screens, and a 4-5 round on-site loop covering coding, system design (at L4+ levels), and behavioral. Reports tagged on LeakCode show the round-by-round distribution and typical difficulty calibration. To browse questions filtered by round type and seniority, use the company hub linked above.
How To Practice This Type of Question
Solve similar problems on LeetCode under timed conditions (25-35 minutes per medium difficulty). The goal is pattern recognition: recognize the underlying technique (sliding window, two-pointer, BFS, memoized recursion, etc.) within 60-90 seconds of reading. Strong candidates verbalize their hypothesis out loud before coding, then iterate based on feedback. Weak candidates dive into implementation immediately, lose time on the wrong approach, and run out of time for follow-ups.
Companies update their question pools every 2-4 months. The exact wording of any given question may have been retired by the time you interview. Focus your prep on the pattern, not the specific problem. The patterns that appear in Matrix Comsec reports consistently are the ones worth investing in; one-off niche problems are not.
During Your Matrix Comsec Round
Apply the standard interview round template: clarify requirements (2-3 minutes), state your approach out loud and confirm direction with the interviewer (3-5 minutes), code with narration (15-25 minutes), test with concrete examples including edge cases (5 minutes), discuss optimization or trade-offs if time permits (5 minutes). This template is universally accepted across FAANG and adjacent companies; deviating from it produces weaker interviewer feedback signal.
The single most predictive failure mode in Matrix Comsec reports tagged "no hire": not asking clarifying questions. Interviewers are explicitly trained to weight this. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into code immediately. The clarifying-question check is often the first signal recorded in the interviewer's written notes.