Confluent — Software Engineer ❌ Failed
Level: Senior-Level
Round: Onsite · Type: Multiple Types · Difficulty: 7/10 · Duration: 300 min · Interviewer: Unfriendly
Topics: System Design, Data Structures, Algorithms, Behavioral
Location: San Francisco Bay Area
Interview date: 2023-12-31
Got offer: False
Summary
Round 1: System Design
Question: Design a key-value store for Kafka on a single machine, including WAL (Write-Ahead Logging), snapshotting, and recovery.
Round 2: Coding
Question: Implement get, put, average, and maxWindow functions using system time in O(1) time complexity.
Round 3: System Design
Question: Design TinyURL, ensuring one long URL maps to only one short URL, including sharding and DNS considerations.
Round 4: Coding
Question: Implement a DelayScheduler using a heap and timer-lock.
Round 5: Behavioral
Question: General career and background questions with the hiring manager.
Details
Preparation Tips & Key Takeaways
What I Learned
- System design interviews require a deep understanding of trade-offs and scalability concerns.
- Coding interviews can focus on optimizing data structures and algorithms for specific use cases.
- Behavioral interviews are a crucial part of assessing fit and experience.
Recommended Preparation
Coding Practice
- Practice implementing data structures like heaps.
- Focus on time complexity analysis and optimization.
System Design
- Study distributed system design patterns, including sharding and caching.
- Review consistency and fault tolerance techniques.
Behavioral Questions
- Prepare examples that showcase problem-solving skills.
- Practice explaining technical concepts clearly and concisely.
Resources I Recommend
- LeetCode for coding practice.
- System Design Primer for system design concepts.
Common Pitfalls to Avoid
- Neglecting time complexity during coding interviews.
- Lack of clarity in explaining system design choices.
- Not preparing thoroughly for behavioral questions.