Round: Full Journey · Type: Multiple Types · Difficulty: 5/10 · Duration: 180 min · Interviewer: Neutral
Topics: Social Network, Payment System, System Design
Location: San Francisco Bay Area
Interview date: 2025-12-28
Got offer: False
Summary
Round 1: Coding
Question: Implement follow/unfollow functionality for a social network. Implement snapshot and check if a user is following another user at a particular snapshot in time. Recommend top k users based on follower count.
Round 2: System Design
Question: Design a payment system.
Details
Preparation Tips & Key Takeaways
What I Learned
I need to be very comfortable with implementing social network features.
System design questions require a broad understanding of different components.
Recommended Preparation
Coding Practice
Practice implementing social network functionalities such as follow/unfollow, post feeds.
Practice questions involving snapshots and historical data.
System Design
Study common payment system architectures.
Review different design patterns used in large-scale systems.
Resources I Recommend
LeetCode for coding practice.
System design interview prep materials.
Common Pitfalls to Avoid
Neglecting edge cases in coding implementation.
Not considering scalability and fault tolerance in system design.