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 Blend 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
1 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?
Blend practice problems
Company-linked challenges and related lessons from our library. Not a prediction of your interview.
Challenge
Difficulty 4/10
Identical Trees
Challenge
Difficulty 4/10
Implement a Graph
Challenge
Difficulty 4/10
Sum All Primes
Challenge
Difficulty 7/10
Build a Calculator
Challenge
Difficulty 8/10
The Coin Change Problem
Challenge
Difficulty 7/10
Flood Fill Paintbucket
Real interview experiences
1 report from candidates who interviewed at Blend.
What people at Blend say
Reviews originally posted on Glassdoor.
There so much still left to be done - so there's rarely that feeling of wondering where the next piece of exciting work will come from. People are especially bright and energetic.
Free food, company is building strategic relationships with customers and expanding to new product areas, great office and great location, unlimited PTO, generally very friendly, smart coworkers.
a product that you can actually be proud of contributing to (making the mortgage lending process less tedious and more transparent)
Blend Labs is great for recent college graduates looking for what a startup can provide--plenty of opportunities to build out substantial code, a tightly knit community, and high institutional transparency.
New office with lots of light. Free lunch and dinner, and a well stocked kitchen. Sit-stand desks and Herman Miller Aeron chairs.