IBM Coding Interview Questions (2026)
Most-reported questions and how to practice them
178 coding questions reported by candidates for IBM, sorted by how often they were reported. Source: community-sourced LeetCode company lists.
What the IBM question data shows
Of the 178 questions reported for IBM, 59% are medium, 10% are hard and 31% are easy. The most reported are Fizz Buzz, Two Sum, Longest Substring Without Repeating Characters, Integer to Roman, Best Time to Buy and Sell Stock.
This list comes from community-sourced LeetCode company lists. It covers coding questions only. It does not tell us how many rounds IBM runs, what each round covers, or what it pays, and those change by role, level and team, so we do not list them. Ask your recruiter what each round covers, and check the company's careers page.
Prepare for the rest of the loop with the coding interview patterns guide, the system design framework, and the STAR method guide. Written by Kieron.
Practice what you read with a free AI mock interview, see how the tools compare in our AI interview copilot comparison, or check Aissence pricing.
IBM Interview Questions
178 LeetCode questions — sorted by frequency. Question frequency is community-sourced from public interview reports and may not reflect the current process; verify details with the employer.
Last reviewed: September 5, 2026 · Source: LeetCode company-wise interview questions (community reports) · Reviewed by the Aissence Editorial Team.
Fizz Buzz
Two Sum
Longest Substring Without Repeating Characters
Integer to Roman
Best Time to Buy and Sell Stock
Count Ways to Group Overlapping Ranges
Merge Intervals
Roman to Integer
Valid Parentheses
Rotate Image
Minimum Operations to Make Median of Array Equal to K
Find The First Player to win K Games in a Row
Find Occurrences of an Element in an Array
Activity Participants
Subarray Sum Equals K
Minimum Operations to Make All Array Elements Equal
Minimum Moves to Equal Array Elements
Longest Palindromic Substring
Palindrome Number
Letter Combinations of a Phone Number
Tips for Success at IBM
Start with the 30 most reported IBM questions, then work down the list.
Mediums are the bulk of the list (59%), so spend most of your time there.
Time yourself: 20 to 30 minutes per medium, then explain your solution out loud as if to an interviewer.
After each problem write down the pattern and the signal that revealed it. Patterns transfer to problems you have not seen.
Pair coding practice with a system design framework and prepared behavioral stories; most loops include more than coding.
How to Practice for IBM Interviews
Practice answering out loud with an AI interviewer built from your resume and the job description, and get a score and specific fixes for each answer. We are not affiliated with IBM, and the mock interview is general practice rather than a simulation of IBM's own format.
- ✓ Free mock interview built from your resume and the job description
- ✓ Desktop Interview Copilot for live interviews, where the rules allow it
- ✓ Behavioral practice with feedback on structure and specifics
- ✓ System design practice with follow-up questions
Frequently Asked Questions
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