SDE 2 at Amazon

How it went

How to prepare

Round by round

1. 1

   Technical Round 160 min

   Interviewer was from United States Problem: Design In-Memory File System LP Questions: Tell me about a time you went above and beyond to help a teammate. How do you ensure high-quality code in a collaborative team? Outcome: Positive

   • Design In-Memory File System
2. 2

   Low Level Design60 min

   Problem: Multi-city ride-hailing service (like Uber/Ola) with real-time booking, demand-based pricing, ETA calculations, and support for multiple vehicle types Focus not just on UML/class skeleton, but on:

   • DB schema (normalized, denormalized, indexing, sharding)
   • APIs
   • Microservices
   • Concurrency (double bookings, surges, dynamic pricing)
   • Scalability (hot cities, peak hours, region-based scaling)
   • Trade-offs
3. 3

   High Level Design60 min

   HLD Question: Design a real-time customer support chat platform for Kindle users, handling millions of concurrent chats, bot integration, and seamless agent handoff. Requirements:

   • Real-time chat
   • Message persistence, delivery guarantees, and read receipts
   • Bot integration (NLP, intent detection, escalation rules) the interviewer was providing me with some hints One LP question
4. 4

   Bar Raiser60 min

   The interviewer gave me a variant of the maximum product subarray problem—find the contiguous subarray with the maximum product, but the array can contain zeros and negative numbers.

What came up