Hey everyone, hope you're doing well!
I recently had a chance to interview for SDE 3 role at super.money

Round 1: Data Structures & Problem Solving

• Database Migration: How to migrate data from one DB to another with minimal downtime.
• Oncall Scenario: API SLA breach (>100ms). Steps to investigate, diagnose, and mitigate.

Round 2: High-Level Design (HLD)

• Design Online Chess (Focus on matchmaking - FCFS).

Round 3: Machine Coding

Build a Pub-Sub Library with the following capabilities:

1. The library should have the notion of a Topic, Publisher, and Consumer. The publisher publishes to a topic, and multiple consumers can consume from a topic.
2. One topic can have multiple consumers and publishers.
3. The library should be able to manage multiple topics:
   • Create topics
   • Delete topics
4. Consumers should be able to consume when a message is received for the topic.
5. Ability to publish messages in parallel.
6. Graceful handling of exceptions.
7. Offset Management for Consumers.
8. Topics should have a max retention period beyond which messages should be deleted (topic-level property).
9. [Bonus-1] Ability to reset offset and replay messages from a particular offset.
10. [Bonus-2] Visibility into consumer/topic status based on last offset read or lag.

Round 4: Low-Level Design (LLD)

• Design Google Calendar
  • API Endpoints, Design Patterns, Classes

Round 5: Project Deep Dive [Hiring Manager]

• Discussed past projects in detail, technical challenges.

Overall, it was a very positive experience. Each interviewer was supportive and helpful throughout the process. They were open to listening to my thoughts and encouraged discussions rather than just evaluating answers.

Verdict: Hire for SDE-2

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