Block (Square) Interview Questions and Guide

Collaborative pair programming, real-world refactoring and TDD, distributed ledger consistency, and point-of-sale offline resilience.

The Block (Square) interview loop

1. Recruiter screen
2. Pair programming screen
3. Onsite: 2 practical pair programming rounds, 1 systems design, 1 leadership / values

Block (Square) interview questions

• Design a Payment System
• Design Airbnb
• Design Cash App (P2P Payments)
• Design a Stock Exchange
• In-Memory Database (Multi-Part)
• Time-Based Key-Value Store
• Design a Digital Wallet
• Design a Stock Exchange Order Book
• Walk me through your most impactful project
• Why do you want to work here?