Same models as the posts, written so you can sit with one subject.

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  Low-level design, as it shows up in a request

  LLD as I walk it: ten headings on every system, then the same walk on a lot, a seat, a cache, a lift, a wallet. For a first board. My models, not a syllabus.

  39 pages

  ₹199₹4975% off

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  Computer networks, as they show up on a box

  Computer networks from first words: process, packet, IP, port, then tuples, NAT, ping, and what to measure when a connect fails. My models, not a syllabus.

  20 pages

  ₹199₹4975% off

  PreviewBuy

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Short working notes, not these PDFs, are on Study.