Topics: Graphs, Data Structures, Multithreading, System Design, Databases
Location: Los Gatos, CA
Interview date: 2025-05-15
Got offer: False
Summary
Round 1: Coding
Question: Graph problem with timestamped edges; implement add edge and search for edges within a time range and depth. Discussed tradeoffs in implementation.
Round 2: Multithreading
Question: Design a thread-safe counter with increment and decrement operations. Implement a wait function that notifies waiting threads when the counter reaches zero.
Round 3: System Design
Question: Design a system to replicate a source database's Write-Ahead Log (WAL) to a target database, handling a write load of approximately 1M/s. Enrich the WAL logs during replication.
Details
Preparation Tips & Key Takeaways
What I Learned
Communication is key in coding rounds. I should clearly articulate my thought process and discuss tradeoffs of different approaches.
For multithreading problems, I need to have a solid understanding of thread synchronization primitives and potential race conditions.
System design interviews require a broad understanding of database systems and replication strategies.
Recommended Preparation
Coding Practice
Practice graph traversal algorithms with time-based constraints.
Implement different data structures for storing graph edges and analyze their time complexity.
Multithreading
Study common concurrency patterns such as locks, semaphores, and condition variables.
Practice designing thread-safe data structures and algorithms.
System Design
Review database replication techniques and WAL implementation.
Study system design principles for handling high write loads.
Resources I Recommend
LeetCode for coding practice.
Books on distributed systems and database internals.
Online system design courses.
Common Pitfalls to Avoid
Neglecting to discuss tradeoffs in coding problems.
Overlooking potential race conditions in multithreading problems.
Failing to consider scalability and performance in system design interviews.