The complete path from beginner to job-ready — interactive tutorials, coding interview prep, and certification exams. All in one place, no installs needed.
Free forever for the basics. Upgrade to unlock everything.
7
Languages
1442+
Lessons
114+
Interview Qs
7
Certs
From your first line of code to a certification — everything in one place.
Learn
Short, focused tutorials with real code examples. Zero setup — write and run code right in your browser.
Practice
Solve real interview problems to sharpen the skills interviewers actually test. Same IDE, every language we support.
Certify
Take a timed exam and earn a certificate that proves you've truly mastered the language.
Get hired
Walk into any technical interview job-ready — with proof of your skills to back it up.
Three tools that work together. Zero context-switching, zero extra platforms.
Interactive Tutorials
Write and run real code in your browser. Step-by-step lessons with instant AI-powered feedback — no installs, no setup.
Interview Prep
Coding challenges covering arrays, strings, dynamic programming, trees, and graphs. AI hints when you're stuck.
Certifications
Pass a timed exam and earn a certificate that shows you've genuinely understood the language — not just memorised it.
Pick one and build real skills — guided tutorials, interview prep, and a verifiable certificate, every step of the way.
Master Go (Golang) from the ground up with hands-on, interactive tutorials. Learn variables, functions, goroutines, channels, structs, interfaces, and APIs — write and run real Go code in your browser. Free beginner lessons included.
Learn Python step by step with interactive, hands-on tutorials. Cover variables, data types, loops, functions, classes, modules, error handling, and async — write and run real Python code in your browser. Free beginner lessons included.
Learn C++ from scratch with interactive, hands-on tutorials. Cover variables, data types, loops, functions, pointers, classes, templates, and modern C++ patterns — compile and run real C++ code in your browser. Free beginner lessons included.
Learn JavaScript step by step with interactive, hands-on tutorials. Cover variables, functions, arrays, objects, DOM manipulation, async/await, and modules — write and run real JavaScript code in your browser. Free beginner lessons included.
Learn Java step by step with interactive, hands-on tutorials. Cover variables, data types, loops, classes, inheritance, interfaces, collections, and concurrency — compile and run real Java code in your browser. Free beginner lessons included.
Learn Rust from scratch with interactive, hands-on tutorials. Cover variables, ownership, borrowing, structs, enums, pattern matching, traits, error handling, and concurrency — compile and run real Rust code in your browser. Free beginner lessons included.
Learn C# step by step with interactive, hands-on tutorials. Cover variables, data types, classes, LINQ, async/await, interfaces, and .NET patterns — compile and run real C# code in your browser. Free beginner lessons included.
Languages developers are studying right now.
Real interview questions — solve in your language of choice, get instant feedback.
Two Sum
Valid Parentheses
Best Time to Buy and Sell Stock
Reverse String
Climbing Stairs
Contains Duplicate
Take a timed exam and earn a certificate that shows you actually know your stuff — not just that you watched a video.
Questions
40
Time limit
45min
Attempts
3
Pass rate
0%
Questions
40
Time limit
45min
Attempts
1
Pass rate
0%
Questions
40
Time limit
45min
Attempts
0
Pass rate
—
Questions
40
Time limit
45min
Attempts
1
Pass rate
0%
Questions
40
Time limit
45min
Attempts
0
Pass rate
—
Questions
52
Time limit
56min
Attempts
0
Pass rate
—
Questions
40
Time limit
45min
Attempts
0
Pass rate
—