IBM

IBM

Global technology and consulting firm with deep roots in enterprise IT and AI.

3 Rounds ~14 Days Medium
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Software Engineer • Coding • easy

Given an array of integers and an integer target, return indices of the two numbers such that they add up to target. Assume exactly one solution exists.

#Arrays #Hash Table
Practice
Software Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack
Practice
Software Engineer • Coding • medium

Given an array of intervals representing server downtime, merge all overlapping intervals and return an array of the non-overlapping intervals.

#Arrays #Sorting
Practice
Software Engineer • Coding • medium

Given an m x n 2D binary grid representing a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and formed by connecting adjacent lands horizontally or vertically.

#Graph #DFS #BFS
Practice
Software Engineer • Coding • medium

There are a total of numCourses courses you have to take. You are given an array prerequisites where prerequisites[i] = [a_i, b_i] indicates that you must take course b_i first if you want to take course a_i. Return true if you can finish all courses.

#Graph #Topological Sort #Cycle Detection
Practice
Software Engineer • Coding • hard

Given a network of IBM Cloud data centers represented as nodes and the cost to lay fiber optic cables between them as weighted edges, find the minimum cost to connect all data centers.

#Graph #Minimum Spanning Tree #Union Find
Practice
Software Engineer • Coding • medium

Given a string representing a stream of log characters, find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Table
Practice
Software Engineer • Coding • hard

Given two words, beginWord and endWord, and a dictionary wordList, return the number of words in the shortest transformation sequence from beginWord to endWord.

#Graph #BFS #Strings
Practice
Software Engineer • Coding • easy

Given a string of lowercase English letters, find the first non-repeating character in it and return its index. If it does not exist, return -1.

#Strings #Hash Table #Counting
Practice

Difficulty Radar

Based on recent AI-sourced data.

Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

Simulate

Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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