IBM Interview Questions (2026)

29 questions across 5 categories · Updated April 2026

Algorithms

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Find Median from Data Stream

Hard

Permutation in String

Medium

Search a 2D Matrix

Medium

Word Break

Medium

Behavioral

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Experience with Security Audits

Medium

Contributing to Hiring Process

Easy

Experience with Open Source

Easy

Working with Different Time Zones

Easy

Biggest Professional Mistake

Easy

Leading a Brown Bag Session

Easy

Your Personal Definition of Quality

Medium

A Time You Demonstrated Patience

Easy

Measuring Technical Debt

Medium

Data Structures

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Implement a Deque (Double-Ended Queue)

Medium

Flatten a Multilevel Doubly Linked List (Stack)

Medium

Word Dictionary with Wildcards (Trie)

Hard

Design a Simple Spell Checker (Trie/Set)

Easy

Product Strategy

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Metrics for Measuring 'Ease of Use'

Medium

How to Drive Adoption of a New Testing Framework

Medium

Design a System for Feature Deprecation

Medium

Product Strategy for Open-Source Software

Medium

Metrics for Successful Adoption of Microservices

Medium

Product Strategy for an Internal Developer Platform

Medium

How to Measure the Success of a Bug Fix?

Easy

Trade-offs: Localized vs. Globalized Product

Medium

System Design

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Design a System for Monitoring Service Mesh (Istio/Linkerd)

Hard

Design a Simple API Throttling Mechanism

Easy

Design an Online Code Editor/Compiler Service

Medium

Design an Enterprise Resource Planning (ERP) System

Hard

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