The core track. Every lesson starts from the answer you would reach for under pressure and rewrites it into the optimal one, with the complexity argument spelled out.
194lessons
62topics
3of 3 levels live
~80hours of reading
101Foundations
Foundations
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Master coding interviews with comprehensive coverage of data structures, algorithms, and problem-solving techniques. Progress from fundamentals to advanced topics with expertly curated content.
102 lessons · 28 topics · ~38 hours
ArraysHashTableTwo PointersSliding WindowListStack+18 more
QueueRecursionBinary TreeTree TraversalBSTPriority QueueSortingBinary SearchDivide and ConquerGraphMatrix TraversalsBacktrackingGreedyIntervals & Line SweepDynamic ProgrammingTrieDesign and CodeBit manipulations
Networking and protocols up through storage, search and messaging, then the architecture patterns that combine them — with the diagrams you are expected to draw on the whiteboard.
120lessons
28topics
2of 4 levels live
~31hours of reading
101Foundations
Foundations
19 free
Master system design interviews with scalable architecture patterns, distributed systems, and real-world design challenges.
81 lessons · 20 topics · ~12 hours
OSI Networking ModelTCP & UDPDNSHTTP & HTTPSREST APIsRPC (Remote Procedure Call)+14 more