IBM

IBM

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

3 Rounds ~14 Days Medium
Start Mock Interview

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

Full Stack Engineer • Coding • easy

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

#Strings #Stack
Practice
Full Stack Engineer • Coding • medium

Find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Set
Practice
Full Stack Engineer • Coding • medium

Given an array of strings, group the anagrams together. You can return the answer in any order.

#Arrays #Hash Table #Sorting
Practice
Full Stack 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. Optimize for time complexity.

#Arrays #Hash Table
Practice
Full Stack Engineer • Coding • hard

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.

#Arrays #Two Pointers #Dynamic Programming
Practice
Full Stack Engineer • Coding • easy

Reverse a singly linked list. Provide both iterative and recursive solutions.

#Linked Lists #Recursion
Practice
Full Stack Engineer • Coding • medium

Find the lowest common ancestor (LCA) of two given nodes in a binary tree.

#Trees #Depth-First Search #Recursion
Practice
Full Stack Engineer • Coding • medium

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands.

#Graphs #Depth-First Search #Breadth-First Search
Practice
Full Stack Engineer • Coding • medium

Return a deep copy (clone) of a connected undirected graph.

#Graphs #Hash Table #Depth-First Search
Practice
Full Stack 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.

#Graphs #Breadth-First Search
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.

Practice Now