Most courses show you the controls. Ours hand you a screwdriver. Interactive, depth-first courses that open the machine, let you drive it, and quiz you until it sticks.
One at a time, built with obsession. Each course is a complete journey — not a playlist of fragments.
From bytes on a platter to planet-scale consensus. Storage engines, B-Trees and LSM-Trees, transactions and recovery, replication, Paxos and Raft, the operator's world of scaling and reliability — then you build a real database from scratch in Java to make all of it permanent. Junior-engineer to CTO depth, with living machinery you can drive.
Everything between a question and a grounded answer. Chunking and embeddings, the inverted index and BM25, HNSW, IVF and product quantization, hybrid search and rank fusion, reranking, context assembly, agentic and graph retrieval — then how to actually measure whether any of it works. Built from the papers, not from blog posts.
What a language model actually is, one layer at a time. Tokenizers and the traps in them, attention and the block, what pretraining costs, scaling laws, decoding and tool use, fine-tuning, LoRA and DPO, quantization and the serving arithmetic, evaluation and security — then you build PocketLM, a working model, in Python and C.
Processes, schedulers, virtual memory, filesystems, and the syscall boundary — the machine your machine runs on.
From voltage on a wire to HTTP/3 — routing, congestion, TLS, and why the internet works anyway.
Lexers, parsers, type checkers, IRs, and optimizers — the road from source text to machine code.
Three rules, no exceptions.
No hand-waving. If a B-Tree splits, you'll watch it split. Every claim traces down to the bytes — worked examples, real numbers, the actual algorithms.
Diagrams you can read, simulations you can drive, quizzes that push back. You don't watch these courses — you operate them.
Every course opens with free chapters — no card, no sign-up. Open a page and start learning. Everything runs in your browser, and your progress stays there. Go further with one membership and an email sign-in.