LeetCode

LeetCode is a coding practice and technical-interview preparation platform used by software engineers, students, and developers preparing for programming interviews. Its core offering is a large library of algorithm and data-structure problems that users solve directly in an online coding environment. Problems span areas such as arrays, strings, linked lists, trees, graphs, dynamic programming, databases, system design, and competitive programming. The platform also includes company-specific problem information, contests, discussion forums, and learning resources.

LeetCode’s Premium subscription adds additional interview-preparation capabilities, including access to company-tagged questions, premium problems, enhanced solutions and explanations, interview simulations, and other advanced preparation resources. This makes the platform particularly valuable for candidates targeting technical roles at major technology companies.

The platform is different from AI-first job-application tools such as Simplify or LoopCV because its primary purpose is technical interview preparation rather than job discovery or application automation. Its greatest strength is the depth and breadth of its coding-problem ecosystem. Candidates can practice specific patterns repeatedly, track their progress, participate in contests, and study problems reportedly encountered in company interviews. In 2026, LeetCode also introduced regional pricing in some markets, including India, making Premium more accessible to some users than its previous global pricing.