25 Software Engineer Interview Questions & AI-Powered Answers

25 Software Engineer Interview Questions You Must Prepare For

Software engineer interviews in 2026 test coding skills, system design, and behavioral fit. Here are the 25 most-asked questions with AI-powered answer strategies across all three areas.

Coding Questions (10)

1. "Reverse a linked list" — Linked list patterns
2. "Find the longest palindromic substring" — DP approach
3. "Design an LRU cache" — Hash map + doubly linked list
4. "Merge K sorted lists" — Heap/priority queue
5. "Find connected components in a graph" — BFS/DFS
6. "Two sum" / "Three sum" — Hash map patterns
7. "Binary tree level order traversal" — BFS queue technique
8. "Implement a trie" — Prefix tree implementation
9. "Minimum window substring" — Sliding window
10. "Serialize and deserialize a binary tree" — Pre-order traversal

System Design Questions (8)

1. "Design a URL shortener" — System design patterns
2. "Design Twitter's news feed" — Fan-out, caching, ranking
3. "Design a chat application" — WebSocket, message queues
4. "Design a rate limiter" — Token bucket, sliding window
5. "Design a distributed cache" — Consistent hashing, Redis
6. "Design a file storage system" — Sharding, replication
7. "Design a search engine" — Inverted index, ranking
8. "Design a payment system" — Idempotency, distributed transactions

Behavioral Questions (7)

1. "Tell me about yourself"
2. "Describe a challenging bug you fixed"
3. "How do you handle disagreements with teammates?"
4. "Tell me about a time you mentored someone"
5. "How do you stay current with technology?"
6. "Describe your biggest technical mistake"
7. "Why do you want to work here?"

Prepare with AI

Use AissenceAI's mock interview feature to practice all 25 questions with AI feedback. During the real interview, the AI copilot provides real-time hints for coding and structured talking points for behavioral questions.