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Learn to crack the tech interview

Free courses I wrote for students and junior developers. Everything runs in your browser, and your progress stays on your device.

• DSA sheet

  The data structures and algorithms problems that come up again and again in coding interviews, each with an explanation, a naive and an optimal approach, and tested Java and Python code.

  • 151 problems
  • 18 topics
  • Java + Python

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• System design

  How real systems scale, explained with step-by-step diagrams: caching, databases, queues, consistency and more, with interview questions, case studies and a quiz on every topic.

  • 75 topics
  • 13 modules
  • Diagrams + quizzes

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