Oracle vs Zenefits Interview Questions
Oracle lists 314 LeetCode interview questions while Zenefits lists 21. They share 13 problems — 4% of Oracle's bank and 62% of Zenefits's. Focus on the overlap first, then drill into 301 Oracle-only and 8 Zenefits-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 13 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Oracle and Zenefits.
Step 2 — Company-specific depth: Add Oracle-specific problems like Longest Substring Without Repeating Characters, Two Sum, Group Anagrams 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
13 Shared Questions
High-priority problems to practice for both Oracle and Zenefits.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Number of Islands | Medium |
| Sliding Window Maximum | Hard |
| Valid Parentheses | Easy |
| Reverse Linked List | Easy |
| Trapping Rain Water | Hard |
| Min Stack | Medium |
| Generate Parentheses | Medium |
| Course Schedule | Medium |
| Median of Two Sorted Arrays | Hard |
| Majority Element | Easy |
| Valid Palindrome | Easy |
| Course Schedule II | Medium |
Unique to Oracle (301)
Problems in Oracle's list that do not appear at Zenefits.
| Problem | Difficulty |
|---|---|
| Longest Substring Without Repeating Characters | Medium |
| Two Sum | Easy |
| Group Anagrams | Medium |
| Top K Frequent Elements | Medium |
| Merge k Sorted Lists | Hard |
| Merge Intervals | Medium |
| Meeting Rooms II | Medium |
| Longest Palindromic Substring | Medium |
| Spiral Matrix | Medium |
| Minimum One Bit Operations to Make Integers Zero | Hard |
| LFU Cache | Hard |
| Search in Rotated Sorted Array | Medium |
Unique to Zenefits (8)
Problems in Zenefits's list that do not appear at Oracle.
| Problem | Difficulty |
|---|---|
| Graph Valid Tree | Medium |
| Majority Element II | Medium |
| Excel Sheet Column Title | Easy |
| Convert Sorted List to Binary Search Tree | Medium |
| N-Queens II | Hard |
| Flatten 2D Vector | Medium |
| Shortest Distance from All Buildings | Hard |
| Verify Preorder Sequence in Binary Search Tree | Medium |
Frequently Asked Questions
How many LeetCode questions do Oracle and Zenefits share?
Oracle and Zenefits share 13 LeetCode interview questions. 301 problems appear only in Oracle's list and 8 appear only in Zenefits's list.
What topics overlap most between Oracle and Zenefits?
The most common shared topics between Oracle and Zenefits are Array (5 shared questions), Depth-First Search (3 shared questions), Breadth-First Search (3 shared questions), String (3 shared questions), Stack (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Oracle or Zenefits?
Oracle has 61 Easy, 194 Medium, and 59 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 Oracle and Zenefits?
Start with the 13 shared problems since they cover what both companies ask most often. Then add 20 Oracle-specific and 8 Zenefits-specific questions to round out your prep.