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?

Leadership Principles, DSA, LLD, HLD, Project discussion