🔍 Code Review This

Spot the bugs — interactive code review challenges

Every Monday/Wednesday
  1. #4

    Code Review This: A SQL Query That Takes 47 Seconds

    This SQL query returns the right data but takes 47 seconds. Can you spot the 8 performance problems?
  2. #3

    Code Review This: A Dockerfile That Produces a 2GB Image

    This Dockerfile works but produces a 2GB image that takes 10 minutes to build. Can you spot the 10 problems?
  3. #2

    Code Review This: An Express API That Will Get Hacked

    This Express.js API has 12 security vulnerabilities. Can you find them all before an attacker does?
  4. #1

    Code Review This: A React Component with 14 Problems

    Can you spot all 14 issues in this React component? Test your code review skills with this interactive challenge.