Coding fluency
Implement an LRU cache. Explain your data structures, test capacity one, and walk through an eviction.
What a strong answer demonstrates
Correctness, edge cases, and time / space complexity.
Prepare for Cockroach Labs with a focused mix of coding, design, and communication. Start with your job description and confirm the interview loop with your recruiter.
6 Practice picks
3 Interview reports
5 Levels mapped
01 / MAKE YOUR NEXT SESSION COUNT
Your preparation, made concrete.
System design
Design a notification service. Clarify delivery guarantees, model the data, then handle retries and duplicate events.
What a strong answer demonstrates
Clear requirements, a working baseline, and explicit trade-offs.
Behavioral storytelling
Describe a technical decision you changed after receiving feedback. Explain your contribution and the outcome.
What a strong answer demonstrates
Specific actions, honest reflection, and measurable impact.
BEFORE YOU PRACTICE
Ask your recruiter.
Get the details that a generic company guide cannot know.
- Which team and level is this opening for, and what does success look like?
- What rounds, durations, and evaluation criteria should I prepare for?
- Which languages, tools, and AI assistance are permitted?
- Will design focus on frontend, backend, infrastructure, or another specialty?
- Are there accommodations or preparation materials I should request?
Cockroach Labs practice problems
Company-linked challenges and related lessons from our library. Not a prediction of your interview.
Challenge
Difficulty 7/10
Sum Right Side Leaves
Challenge
Difficulty 5/10
Decimal To Binary
Challenge
Difficulty 4/10
Max of Min Pairs
Challenge
Difficulty 5/10
Zeros to the End
Challenge
Difficulty 6/10
Reverse a Linked List
Challenge
Difficulty 5/10
String From Binary Tree
Real interview experiences
3 reports from candidates who interviewed at Cockroach Labs.
What people at Cockroach Labs say
Reviews originally posted on Glassdoor.
High quality engineering team. Different viewpoints are respected and junior team members listened to. A lot of freedom to decide how you work best.
Builds interesting complex systems without sacrificing quality
Solid pay, great work life balance
Making the switch to CRL was the best move I’ve ever made. No one here has a huge ego. The team also makes you feel like your voice is genuinely heard.
The work is challenging and engaging, and it gave me the opportunity to develop some valuable software engineering skills in a relatively short period of time. The engineering standards are high, especially due to the fact that the code base is open source and available for the general public to see.
Inside the workplace
About Cockroach Labs
A day at Cockroach Labs