Dropbox Coding Interview Questions
We track 22 coding questions asked at Dropbox, tagged with the algorithms and concepts they test. The most common: Array, Hash Table, String, Design, Simulation.
Browse all 22 Dropbox questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array24.8%
- Hash Table17.2%
- String10.4%
- Design5.1%
- Simulation4.2%
- Math3.0%
- Greedy2.8%
- Heap (Priority Queue)2.8%
- Sorting2.8%
- Backtracking2.6%
- Other (17)24.7%
How many questions involve each concept
Share of all 22 tracked Dropbox questions that touch each concept. Questions usually involve several, so these overlap.
- Array63.6%
- Hash Table45.5%
- String31.8%
- Design13.6%
- Simulation13.6%
- Backtracking9.1%
- Breadth-First Search9.1%
- Depth-First Search9.1%
- Graph Theory9.1%
- Math9.1%
- Trie9.1%
- Union-Find9.1%
Where Dropbox differs from the average company
Concept weight at Dropbox relative to the average across all companies we track. Green means Dropbox leans on it harder than most.
- Design3.9×
- Trie3.8×
- Union-Find2.7×
- Hash Table2.6×
- Depth-First Search0.83×
- Math0.54×
Dropbox specialties
Concepts that show up at Dropbox but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 22 tracked Dropbox questions.
- Junior9% (2)
- Mid/Senior45% (10)
- Staff45% (10)
Every concept in Dropbox interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 14 | 63.6% | 24.8% |
| Hash Table | 10 | 45.5% | 17.2% |
| String | 7 | 31.8% | 10.4% |
| Design | 3 | 13.6% | 5.1% |
| Simulation | 3 | 13.6% | 4.2% |
| Backtracking | 2 | 9.1% | 2.6% |
| Breadth-First Search | 2 | 9.1% | 1.9% |
| Depth-First Search | 2 | 9.1% | 1.9% |
| Graph Theory | 2 | 9.1% | 1.9% |
| Math | 2 | 9.1% | 3.0% |
| Trie | 2 | 9.1% | 1.9% |
| Union-Find | 2 | 9.1% | 1.9% |
| Binary Search | 1 | 4.5% | 1.9% |
| Bit Manipulation | 1 | 4.5% | 1.1% |
| Divide and Conquer | 1 | 4.5% | 1.9% |
| Doubly-Linked List | 1 | 4.5% | 0.9% |
| Dynamic Programming | 1 | 4.5% | 0.8% |
| Game Theory | 1 | 4.5% | 1.1% |
| Greedy | 1 | 4.5% | 2.8% |
| Heap (Priority Queue) | 1 | 4.5% | 2.8% |
| Interactive | 1 | 4.5% | 1.1% |
| Linked List | 1 | 4.5% | 0.9% |
| Matrix | 1 | 4.5% | 1.9% |
| Memoization | 1 | 4.5% | 0.8% |
| Number Theory | 1 | 4.5% | 1.9% |
| Sorting | 1 | 4.5% | 2.8% |
| Stack | 1 | 4.5% | 0.9% |
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