Master Coding Through Challenges

Elevate your programming skills with our curated collection of real-world coding challenges. Learn, build, and grow as a developer.

Featured projects

easy

Hello World API

Get started with building your first API

Beginner
API
Accept project
medium

URL shortener

Create a url shortener API

in-memory storage
express
redirection
Accept project
hard

Real-Time Game Leaderboard

Implement an ELO rating system for a game leaderboard.

backend
leaderboard
Accept project
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How It Works

Choose a Challenge

Browse our extensive collection of coding challenges across various difficulty levels and technologies.

Code Your Solution

Write your solution using your preferred programming language and development environment.

Submit and Learn

Submit your solution, receive feedback, and learn from other developers' approaches.

Explore Our Learning Tracks

Backend

Hands on backend development

Frontend

Hands on frontend development

Machine Learning

Hands on machine learning

Explore our learning tracks

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What Our Users Say

AM

Amir Mallek

Software engineering student

"Oncode has been instrumental in extending my coding skills and learning web dev. The challenges are practical and fun!"

NH

Nada Hammami

Data scientist

"Oncode allowed me to quickly learn flask and easily create a web app for my data science projects. The project based approach is very helpful in learning!"

MC

Michael Chen

Computer science student

"As a CS student, Oncode has been an invaluable resource for practicing and learning new web development technologies."

Ready to Level Up Your Coding Skills?

Join thousands of developers who are mastering programming through real-world challenges.