PayPal Coding Interview Questions
We track 100 coding questions asked at PayPal, tagged with the algorithms and concepts they test. The most common: Array, Hash Table, String, Sorting, Dynamic Programming.
Browse all 100 PayPal questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array24.3%
- String8.5%
- Hash Table7.6%
- Dynamic Programming6.7%
- Sorting5.3%
- Binary Search4.6%
- Two Pointers4.0%
- Math3.5%
- Greedy3.2%
- Matrix3.1%
- Other (30)29.2%
How many questions involve each concept
Share of all 100 tracked PayPal questions that touch each concept. Questions usually involve several, so these overlap.
- Array68.0%
- Hash Table25.0%
- String25.0%
- Sorting20.0%
- Dynamic Programming19.0%
- Binary Search13.0%
- Two Pointers13.0%
- Greedy11.0%
- Matrix10.0%
- Breadth-First Search9.0%
- Counting9.0%
- Math9.0%
Where PayPal differs from the average company
Concept weight at PayPal relative to the average across all companies we track. Green means PayPal leans on it harder than most.
- Bucket Sort3.0×
- Quickselect3.0×
- Counting2.3×
- Doubly-Linked List1.7×
- Tree0.60×
- Sliding Window0.60×
- Trie0.60×
- Binary Tree0.31×
PayPal specialties
Concepts that show up at PayPal but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 100 tracked PayPal questions.
- Junior19% (19)
- Mid/Senior64% (64)
- Staff17% (17)
Every concept in PayPal interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 68 | 68.0% | 24.3% |
| Hash Table | 25 | 25.0% | 7.6% |
| String | 25 | 25.0% | 8.5% |
| Sorting | 20 | 20.0% | 5.3% |
| Dynamic Programming | 19 | 19.0% | 6.7% |
| Binary Search | 13 | 13.0% | 4.6% |
| Two Pointers | 13 | 13.0% | 4.0% |
| Greedy | 11 | 11.0% | 3.2% |
| Matrix | 10 | 10.0% | 3.1% |
| Breadth-First Search | 9 | 9.0% | 2.6% |
| Counting | 9 | 9.0% | 2.3% |
| Math | 9 | 9.0% | 3.5% |
| Depth-First Search | 8 | 8.0% | 1.8% |
| Heap (Priority Queue) | 8 | 8.0% | 1.9% |
| Prefix Sum | 6 | 6.0% | 2.0% |
| Simulation | 6 | 6.0% | 2.0% |
| Design | 5 | 5.0% | 1.2% |
| Divide and Conquer | 5 | 5.0% | 1.3% |
| Linked List | 5 | 5.0% | 2.3% |
| Stack | 5 | 5.0% | 1.8% |
| Backtracking | 3 | 3.0% | 0.8% |
| Graph Theory | 3 | 3.0% | 0.8% |
| Tree | 3 | 3.0% | 0.9% |
| Union-Find | 3 | 3.0% | 0.7% |
| Binary Tree | 2 | 2.0% | 0.4% |
| Bucket Sort | 2 | 2.0% | 0.3% |
| Doubly-Linked List | 2 | 2.0% | 0.5% |
| Quickselect | 2 | 2.0% | 0.3% |
| Recursion | 2 | 2.0% | 0.9% |
| Sliding Window | 2 | 2.0% | 0.9% |
| Topological Sort | 2 | 2.0% | 0.5% |
| Trie | 2 | 2.0% | 0.3% |
| Bit Manipulation | 1 | 1.0% | 0.3% |
| Data Stream | 1 | 1.0% | 0.2% |
| Database | 1 | 1.0% | 1.0% |
| Memoization | 1 | 1.0% | 0.3% |
| Monotonic Stack | 1 | 1.0% | 0.2% |
| Number Theory | 1 | 1.0% | 0.2% |
| Queue | 1 | 1.0% | 0.3% |
| Randomized | 1 | 1.0% | 0.2% |
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