Practice Lab

Solve real engineering dilemmas, write SQL queries, and diagnose production incidents.

0 / 11 Challenges Solved

Exercises (11)

Git

Accidentally Committed .env with Production Keys

SQL

Find the Second-Highest Salary

JavaScript

Event Loop & Microtasks Execution Order

TypeScript

Discriminated Union Type Narrowing

React

Preventing Unnecessary Child Component Re-renders

Regex

Semantic Versioning (SemVer) Matcher

Node.js

Handling High Memory in File Streams

Docker

Docker Container Keeps Exiting Immediately

Linux

Finding High Disk Usage in Server

API

Idempotent HTTP Methods

System Design

Choosing Partition Key for Distributed DB

Git

Accidentally Committed .env with Production Keys

Intermediate
Prompt:

You accidentally committed `.env` containing AWS production credentials and pushed it to public GitHub. What is the most critical first action you should take?

Select your choice: