MongoDB Interview Questions and Guide

B-trees and storage engines, distributed consensus (Raft), query planning and indexing, write-ahead logs, and memory management.

The MongoDB interview loop

1. Recruiter screen
2. Technical phone screen (coding & systems)
3. Onsite: 2 algorithms & data structures, 1 distributed systems / storage engine, 1 behavioral

MongoDB interview questions

• Design a Distributed Cache
• Design a Distributed Key-Value Store
• Design a Distributed Message Queue
• Design a Distributed Lock Service
• In-Memory Database (Multi-Part)
• Implement an LRU Cache
• Intersection of Two Arrays
• Time-Based Key-Value Store
• Snapshot Array
• Compare Version Numbers
• Why do you want to work here?
• Tell me about a difficult technical trade-off you made