What's New

Added 5 new algorithm problems covering string serialization, data stream median calculation, interval scheduling, tree subtree matching, and consecutive sequence detection.

Expanded the JavaScript interview collection with 10 utility function challenges frequently asked in frontend interviews. Covers array manipulation, object utilities, sorting, grouping, and functional programming patterns.

Added a new drawing-tool system design guide for Figma / Canva-style editors, covering requirements, scene graph modeling, renderer tradeoffs, command pipelines, React integration, practical editor challenges, and performance budgets.

Added two new frontend system design guides: Notion and Trello. Notion focuses on block trees, database views, permissions, realtime collaboration, and offline sync. Trello focuses on drag-and-drop performance, ordering convergence, optimistic moves, and collaborative Kanban state.

Added two new frontend system design problems: Pinterest and Rich Text Editor. Both include interview-focused requirements, architecture, data modeling, API contracts, tradeoffs, and optimization guidance.

Interview Simulations are now available to help you practice realistic interview rounds in one place. Experience how real interviewers probe your decisions with follow-ups, curveballs, and coding challenges. Build the reasoning skills that get you hired.

You can now retry JavaScript quiz questions after a wrong answer.

A new JavaScript Quiz category is now live with output-prediction questions, quick feedback, hints, and sequential next-problem flow for faster practice.

You can now like problems, and each problem shows a running like count to reflect what the community finds useful.

A new CSS category is now live with dedicated layout and styling challenges, plus category support in problem discovery and filters.

Track your preparation with a new Progress page showing recent coding submissions, solved counts, acceptance rate, and skill coverage insights.

Earn points for daily practice and redeem them for rewards like 1-week Pro access. Points help track consistent preparation and progress.

Saving and revisiting important problems is now easier with an improved Study List experience.

Add personal notes to problems to capture key insights, mistakes to avoid, and important edge cases for future review.

Leaderboard now lets you view previous sprint winners and get a clearer view of top performers from the past week.

Your profile now includes an Interview Readiness section that summarizes progress and provides insights into how prepared you are for frontend interviews.