Sigmoid Coding Interview Questions
We track 13 coding questions asked at Sigmoid, tagged with the algorithms and concepts they test. The most common: Array, Dynamic Programming, Stack, String, Two Pointers.
Browse all 13 Sigmoid questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array22.1%
- Dynamic Programming10.5%
- Stack9.2%
- String8.3%
- Two Pointers7.3%
- Breadth-First Search5.1%
- Greedy4.5%
- Hash Table4.5%
- Sorting3.8%
- Design3.8%
- Other (7)20.7%
How many questions involve each concept
Share of all 13 tracked Sigmoid questions that touch each concept. Questions usually involve several, so these overlap.
- Array61.5%
- Dynamic Programming30.8%
- Stack23.1%
- String23.1%
- Two Pointers23.1%
- Breadth-First Search15.4%
- Greedy15.4%
- Hash Table15.4%
- Sorting15.4%
- Binary Tree7.7%
- Design7.7%
- Linked List7.7%
Where Sigmoid differs from the average company
Concept weight at Sigmoid relative to the average across all companies we track. Green means Sigmoid leans on it harder than most.
- Stack3.7×
- Breadth-First Search2.3×
- Two Pointers2.0×
- Dynamic Programming1.7×
- Hash Table0.67×
Sigmoid specialties
Concepts that show up at Sigmoid but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 13 tracked Sigmoid questions.
- Junior23% (3)
- Mid/Senior62% (8)
- Staff15% (2)
Every concept in Sigmoid interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 8 | 61.5% | 22.1% |
| Dynamic Programming | 4 | 30.8% | 10.5% |
| Stack | 3 | 23.1% | 9.2% |
| String | 3 | 23.1% | 8.3% |
| Two Pointers | 3 | 23.1% | 7.3% |
| Breadth-First Search | 2 | 15.4% | 5.1% |
| Greedy | 2 | 15.4% | 4.5% |
| Hash Table | 2 | 15.4% | 4.5% |
| Sorting | 2 | 15.4% | 3.8% |
| Binary Tree | 1 | 7.7% | 2.6% |
| Design | 1 | 7.7% | 3.8% |
| Linked List | 1 | 7.7% | 3.8% |
| Monotonic Stack | 1 | 7.7% | 1.5% |
| Prefix Sum | 1 | 7.7% | 3.8% |
| Recursion | 1 | 7.7% | 3.8% |
| Sliding Window | 1 | 7.7% | 2.6% |
| Tree | 1 | 7.7% | 2.6% |
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