LeetCode

LeetCode is an American technology company that provides a platform for users to practice coding skills and prepare for technical interviews. The company was founded in 2012 by Guan Yufeng and is headquartered in Mountain View, California. LeetCode offers a vast library of coding problems, ranging from easy to difficulty levels, covering topics such as algorithms, data structures, and database queries. The platform is widely used by software engineers, computer science students, and professionals seeking to enhance their programming abilities. As of 2023, LeetCode has over 20 million registered users and generates an estimated annual revenue of $50 million through a subscription-based model and enterprise solutions. The platform supports multiple programming languages including Python, Java, C++, and JavaScript. Its core technology stack includes cloud hosting on AWS, a proprietary problem-creation tool, and an automated grading system that evaluates user submissions in real-time. LeetCode's mobile applications are available for both iOS and Android devices, providing users with access to coding problems on the go. The company also hosts online coding contests and partners with tech companies to recruit talent through its platform.