Pick up where you left off

• Review queueSolved problems come back here at 1, 3, 7, 21 and 60 days.
• Start a mock interviewTimed problems from any list, then a self-graded debrief.
• 16-week study planOne topic per week, mixing problems, lessons and guides.

Make today's practice count

Popular lists

All lists

• Grokking Patterns30 easy · 58 medium · 37 hard0 / 125
• Blind 7519 easy · 49 medium · 7 hard0 / 75
• NeetCode 15028 easy · 101 medium · 21 hard0 / 150
• SQL 5032 easy · 17 medium · 1 hard0 / 50

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Coding problems20 listsPython, Java, JavaScript, TypeScript, C++ or Go, judged against hidden edge-case tests.Pattern lessons16 patternsThe mental models behind the problems, from sliding window to topological sort.Interview guides17 guides · 259 chaptersSystem design, AI architecture, object-oriented design, behavioral and the job search.Business Analyst prep14 chapters · 106 lessonsBite-size lessons from BA basics to banking domain and interviews, with a quiz after each chapter and a final exam.