Learn Java for Backend Development
Build the server from the request line up. Built for backend and server engineers. You write real Java, run it in the browser, and watch it pass. No installs, no toy apps, no lectures.
11 projects, 275 hands-on levels, first project free.
Problems you will solve
- parse a raw HTTP request
- route and handle endpoints
- persist and query data
By the end you can build backend services in Java.
What you will build
- Foundations: code through backend servers
- The HTTP Protocol
- A JSON Parser from Scratch
- Routing
- Middleware
- The Repository Layer
- Connection Pooling & Rate Limiting
- Caching
- Validation & DTOs
- Sessions & Auth
- Capstone: A REST Service
Start the Backend Development track free.
Frequently asked questions
Do I need to know how to code to start Backend Development?
No. The Backend Java track starts from the fundamentals and builds up, and the first project is free.
Do I need to install anything?
No. Every level runs in your browser and is graded the moment your code works. No Java install, no setup.
What language will I write?
Java. You write real Java, run it, and get instant feedback across 275 hands-on levels.
Is it free to start?
Yes. The first project is free with no card. Unlimited access to all 33 tracks is $12 a month or $100 a year.