Coding fluency
Implement an LRU cache. Explain your data structures, test capacity one, and walk through an eviction.
What a strong answer demonstrates
Correctness, edge cases, and time / space complexity.
Prepare for IBM with a focused mix of coding, design, and communication. Start with your job description and confirm the interview loop with your recruiter.
6 Practice picks
4 Interview reports
5 Levels mapped
01 / MAKE YOUR NEXT SESSION COUNT
Your preparation, made concrete.
System design
Design a notification service. Clarify delivery guarantees, model the data, then handle retries and duplicate events.
What a strong answer demonstrates
Clear requirements, a working baseline, and explicit trade-offs.
Behavioral storytelling
Describe a technical decision you changed after receiving feedback. Explain your contribution and the outcome.
What a strong answer demonstrates
Specific actions, honest reflection, and measurable impact.
BEFORE YOU PRACTICE
Ask your recruiter.
Get the details that a generic company guide cannot know.
- Which team and level is this opening for, and what does success look like?
- What rounds, durations, and evaluation criteria should I prepare for?
- Which languages, tools, and AI assistance are permitted?
- Will design focus on frontend, backend, infrastructure, or another specialty?
- Are there accommodations or preparation materials I should request?
IBM practice problems
Company-linked challenges and related lessons from our library. Not a prediction of your interview.
Challenge
Difficulty 7/10
Find Deletion Distance
Challenge
Difficulty 7/10
Pick A Sign
Challenge
Difficulty 4/10
Sum All Primes
Challenge
Difficulty 7/10
Invert a Binary Tree
Challenge
Difficulty 4/10
Bottom Left Node Value
Challenge
Difficulty 7/10
Longest Palindromic Substring
Real interview experiences
4 reports from candidates who interviewed at IBM.
What people at IBM say
Reviews originally posted on Glassdoor.
Encouraged to be innovative and expand your skillset (given time during normal work hours). Co-workers are generally positive and help you find your place within a team.
IBM has a very open and accepting culture. Everyone there is really nice and usually easy to work with.
Quick path to promotions/raises if hard working, Pretty lax work environment including work hours, and easy to talk to higher ups.
Excellent work-life balance, plenty of opportunities to work with different technologies, plenty of resources for learning, decent pay and benefits
large companies are known for their bureaucratic swamps that slow things down. IBM does a pretty good job of limiting this and allow you to do your job without all the micro-management. As a professional you are expected to do your job without requiring hand holding. . . I love this part of my job.
Inside the workplace
About IBM
A day at IBM