Duolingo for software engineers
Don't let AI rot your dev brain.
Stay sharp in 5 minutes a day. Pick your stack, keep your streak, don't let your dev brain rot.
10 launch tracks
Pick your stack
Daily practice across the languages, frameworks, and fundamentals experienced developers actually use.
System Design
Scalability basics, caching layers, load balancing, queues, replication, and CAP tradeoffs.
Python
Data model, comprehensions, async, typing, and stdlib idioms.
SQL & PostgreSQL
Joins, indexes, window functions, transactions, and query plans.
Agentic Engineering
Context files, subagents, prompt injection, guardrails, and the model routing that decides whether the agent makes you faster or just slower with extra steps.
JavaScript/TypeScript
Closures, the event loop, `this`, generics, and the type-system tricks you forget when the compiler does the thinking.
Git
Commits, branches, merges, rebases, remotes, recovery, and the collaboration rules that keep a small command from becoming a bad Friday.
React
Hooks rules, the rendering model, memoization, effects, and server components.
Data Engineering
Batch vs. streaming, data modeling, warehouses vs. lakes, orchestration, and analytical SQL.
Java & OOP
OOP design, collections, generics, concurrency, and JVM basics.
Next.js
App Router, caching, server actions, and rendering strategies.
How it works
Three steps. Five minutes. Every day.
Pick your stack
Choose up to 2 tracks that match what you already know, or what you're trying to keep sharp.
5 minutes a day
Short daily sessions mix new concepts with spaced-repetition review of the ones getting rusty.
Keep your streak
Finish one session a day to keep your streak alive and watch your skill tree level up.
Using AI all day is rotting your dev brain? Make sure you still have a solid engineering foundation!
Free to start. No credit card required.