Amazon Software Developer Engineer 1 interview questions

Three rounds: one behavioral, two coding, and one system design mixed in all rounds. OS concepts like locks and tries appeared. Questions weren’t clearly clarified. Behavioral was manageable, but coding wasn’t common LeetCode problems.

Online Assessment (OA) Platform: Amazon’s internal coding portal / Hackerrank Questions: Array manipulation (prefix sums or sliding window) String or hashmap-based problem (e.g. find first unique character) Debugging question (identify and fix logical errors) Difficulty: Medium–Hard Focus Areas: Data Structures (Arrays, Strings, HashMaps), Time Complexity, Edge Cases Technical Round 1 (Data Structures & Algorithms) Duration: 60 minutes Questions Asked: Implement LRU Cache using LinkedHashMap or custom DLL + HashMap. Solve “Longest Substring Without Repeating Characters” (Two Pointer / Sliding Window approach). Follow-up: Discuss time and space complexities. Additional Discussion: Code optimization Handling large input cases and memory efficiency Technical Round 2 (System Design + Problem Solving) Duration: 60 minutes Questions: Design a URL Shortener / BookMyShow Ticket Booking System (Low-Level Design) Implement core classes and relationships Asked about OOP principles, Design Patterns (Singleton, Factory) Follow-ups: How would you scale the system?