Block coding interview questions
30 problems, in the order the guide teaches them. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.
Block system design interview questions
5 designs, each worked end to end in its own lesson, from requirements to the architecture and its trade-offs.
| # | Question |
|---|---|
| 1 | Design a Payments LedgerFree |
| 2 | Design Cash App P2P Transfer (Premium) |
| 3 | Design an Idempotent Payments API (Premium) |
| 4 | Design Real-Time Fraud Detection (Premium) |
| 5 | Design API Rate Limiting (Premium) |
A lock means the design is named here and its walkthrough is Premium.
Block behavioral interview questions
14 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.
Why economic empowerment (3)
Customer focus (2)
Ownership & DRI (3)
Regulatory & compliance maturity (2)
Collaboration & low-ego (2)
Craft & constraint (2)
See all 49 Block questions by name
Premium opens the 39 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.