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IBM interview questions

475 questions from 77 candidate reports · 2015 to 2025

Online test → Online test → Group discussion → Technical·84% entry level

CS fundamentals

Showing 34 of 256 reported in this area

Explain virtualization and its real-life applications
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Explain the four pillars of Object-Oriented Programming.
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Discuss popular cloud platforms and frameworks such as AWS and Azure
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What is a v-table in C++?
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How does React work internally?
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Explain STL concepts used in C++.
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Explain paging and virtual memory.
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How does recursion work internally?
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How is memory allocated at runtime?
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What is the 'virtual' keyword in C++?
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Explain virtual memory and its benefits
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Predict the output of a given C program
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Conceptual questions on DBMS fundamentals
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What is shallow copy and deep copy in C++?
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What are memory leak and memory corruption?
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What are the differences between AWS and GCP?
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What is RAG (Retrieval-Augmented Generation)?
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What are the new features introduced in Java 8?
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Explain how a web page is rendered in a browser.
asked oncemediumPractice this →
Explain public key and private key usage in AWS.
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Explain the basics of SSH and socket programming.
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What are the differences between C++14 and C++20?
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What is a critical section and how is it handled?
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What is SQL injection and how can it be prevented?
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Explain threads and their advantages over processes
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What are interrupts and how does an interrupt work?
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What are iterators in C++ and what is range in C++?
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Answer questions related to software design patterns
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Compare paging and segmentation in memory management.
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What is a Turing machine and what is finite automata?
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Answer conceptual questions related to C++ programming
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Conceptual questions on Operating Systems fundamentals
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Convert Linux commands into their octal representation.
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Which data structure is used to implement cache memory?
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DSA

Showing 14 of 173 reported in this area

Given a string, find the longest palindromic substring
asked 2×mediumPractice this →
Find the number of unique paths in a grid with obstacles.
asked 2×mediumPractice this →
Given a string s and an array of words, check whether s can be formed by concatenating words from the array
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Write the binary search algorithm.
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The Stock Span Problem
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Explain how a Max Heap works.
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Solve House Robber.
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Maximum Sum Increasing Subsequence
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Detect a cycle (loop) in a linked list.
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Convert a prefix expression to postfix expression
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Flatten a linked list with next and child pointers
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Find the number of distinct paths between N points.
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Find the largest palindromic substring in a given string
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Solve the Coin Change problem using dynamic programming.
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Aptitude

Showing 3 of 83 reported in this area

Identify grammatical errors in given sentences.
asked 3×easyPractice this →
Choose the correct spelling from the given options.
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Identify correct synonyms and antonyms for given words.
asked 2×easyPractice this →

Behavioural

Showing 3 of 49 reported in this area

How do you resolve workplace conflicts?
asked oncemediumPractice this →
If your team resists your idea, what will you do?
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Describe how you handle a challenging or unexpected situation.
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Puzzles

Showing 3 of 19 reported in this area

Given a rope that burns out in 1 hour, how will you measure 45 minutes using it?
asked oncemediumPractice this →
Memory-based puzzle requiring recalling objects or patterns seen a short time ago
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Reconstruct a given grid pattern using provided pieces, allowing rotation if necessary.
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System design

Showing 3 of 4 reported in this area

What factors should be considered while designing a website for a grocery store?
asked oncemediumPractice this →
Explain microservices communication patterns, including API Gateway and RestTemplate.
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How would you design a system to shorten a long URL and map it back to the original URL?
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Showing 60 of 475 questions. Ranked by how often the same question came back across reports.

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Common questions

What questions does IBM ask?

Candidate interview reports most often cover CS fundamentals (44%) and DSA (30%).

How many rounds does IBM interview have?

Candidate interview reports show an average of 3.9 rounds per experience, with a typical sequence of Online test → Online test → Group discussion → Technical. Individual interview paths can vary.

Is the IBM interview hard?

Among questions with a reported difficulty, the mix is easy 58%, medium 40%, hard 2%.

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