IBM vs Zenefits Interview Questions
IBM lists 115 LeetCode interview questions while Zenefits lists 21. They share 6 problems — 5% of IBM's bank and 29% of Zenefits's. Focus on the overlap first, then drill into 109 IBM-only and 15 Zenefits-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 6 overlapping problems first. These are the highest-yield questions for candidates interviewing at both IBM and Zenefits.
Step 2 — Company-specific depth: Add IBM-specific problems like Find the Smallest Divisor Given a Threshold, Gray Code, 3Sum and Zenefits-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Zenefits skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
6 Shared Questions
High-priority problems to practice for both IBM and Zenefits.
| Problem | Difficulty |
|---|---|
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Median of Two Sorted Arrays | Hard |
| Generate Parentheses | Medium |
| LRU Cache | Medium |
| Majority Element | Easy |
Unique to IBM (109)
Problems in IBM's list that do not appear at Zenefits.
| Problem | Difficulty |
|---|---|
| Find the Smallest Divisor Given a Threshold | Medium |
| Gray Code | Medium |
| 3Sum | Medium |
| Exclusive Time of Functions | Medium |
| Integer to Roman | Medium |
| Minimum Operations to Make Columns Strictly Increasing | Easy |
| Fizz Buzz | Easy |
| Roman to Integer | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Count Ways to Group Overlapping Ranges | Medium |
| Two Sum | Easy |
| Meeting Rooms II | Medium |
Unique to Zenefits (15)
Problems in Zenefits's list that do not appear at IBM.
| Problem | Difficulty |
|---|---|
| Graph Valid Tree | Medium |
| Number of Islands | Medium |
| Reverse Linked List | Easy |
| Course Schedule | Medium |
| Course Schedule II | Medium |
| Min Stack | Medium |
| Majority Element II | Medium |
| Excel Sheet Column Title | Easy |
| Convert Sorted List to Binary Search Tree | Medium |
| Sliding Window Maximum | Hard |
| N-Queens II | Hard |
| Valid Palindrome | Easy |
Frequently Asked Questions
How many LeetCode questions do IBM and Zenefits share?
IBM and Zenefits share 6 LeetCode interview questions. 109 problems appear only in IBM's list and 15 appear only in Zenefits's list.
What topics overlap most between IBM and Zenefits?
The most common shared topics between IBM and Zenefits are Array (3 shared questions), String (2 shared questions), Stack (2 shared questions), Dynamic Programming (2 shared questions), Divide and Conquer (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: IBM or Zenefits?
IBM has 33 Easy, 73 Medium, and 9 Hard questions. Zenefits has 5 Easy, 11 Medium, and 5 Hard questions. Zenefits has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both IBM and Zenefits?
Start with the 6 shared problems since they cover what both companies ask most often. Then add 20 IBM-specific and 15 Zenefits-specific questions to round out your prep.