Documentation (English)

Versão em português: docs/pt · Versión en español: docs/es

Documentation is organised by area. Every page here has an equivalent page under docs/pt/ and docs/es/. This page is generated by bun run docs:index: do not edit it by hand.

Guides

• Study references for every area
• Project decisions
• Quiz design
• How to write quiz questions
• Mini-project catalog
• Environment: pinned Docker images and formatters
• Benchmark contract and runner
• Brainstorming record

Status by area

3384 of 3384 questions written, 86 of 86 mini-projects done. The roadmap is PLAN.md.

Area	Kind	Questions	Blind review	Mini-projects
Big O and algorithm analysis	Theory and practice	100/100	done	big-o-lab, master-theorem, sorting-lower-bound
Data structures	Theory and practice	100/100	done	hash-map, graph-algorithms, b-tree-on-disk, lru-bloom-trie, balanced-trees
Operating systems	Theory and practice	100/100	done	cpu-scheduling, paging-tlb, memory-allocator, deadlock-mini-shell
Networks	Theory and practice	100/100	done	sliding-window-mini-tcp, aloha-csma, dns-subnet
Databases (theory)	Theory and practice	100/100	done	mini-dbms, normalisation-tool
Algorithms	Theory and practice	100/100	done	sorting-race, dynamic-programming, travelling-salesman, hybrid-quicksort
Concurrency	Theory and practice	100/100	done	counter-race, dining-philosophers, ten-thousand-connections
Parallelism	Theory and practice	100/100	done	scaling-by-cores
Transactions	Theory and practice	100/100	done	isolation-levels, overselling-checkout, orm-vs-sql, outbox-saga
Security	Theory and practice	100/100	done	sql-injection-lab, xss-csp-lab, csrf-lab, access-control-lab, ssrf-lab, passwords-sessions-lab, jwt-lab, upload-path-traversal-lab
Compilers	Theory and practice	100/100	done	mini-language-parser, tree-walking-interpreter, bytecode-vm, regex-engine
State machines	Theory and practice	100/100	done	order-state-machine
Information theory	Theory and practice	100/100	done	huffman-lz77, error-detection-correction
Digital logic	Theory and practice	100/100	done	gates-karnaugh-adders, nand-alu-cpu
Electronics	Theory	170/170	done	none
Object-oriented programming	Theory and practice	100/100	done	oop-vs-functional, code-smells
Functional programming	Theory and practice	100/100	done	pure-functions-properties
Design patterns and SOLID	Theory and practice	100/100	done	backend-patterns, solid-before-after
Software architecture	Theory and practice	100/100	done	clean-architecture-app
Testing	Theory and practice	100/100	done	test-pyramid, tdd-kata, mutation-testing, flaky-tests, mini-xunit
Protocols	Theory and practice	100/100	done	rest-graphql-jsonrpc, http-versions, http-server-raw-tcp
Messaging	Theory and practice	100/100	done	queue-comparison, idempotency-dlq, pubsub-backpressure
Load balancing	Theory and practice	100/100	done	nginx-vs-caddy, l7-load-balancer
Performance	Theory and practice	100/100	done	bun-vs-node, k6-scenarios, cache-friendly-matrix
Cache	Theory and practice	100/100	done	cache-strategies
Rate limiting	Theory and practice	100/100	done	rate-limiter
File systems	Theory and practice	100/100	done	file-organisation, external-sorting
Observability	Theory and practice	100/100	done	three-signals, structured-logs, slo-alert, flame-graph
Blockchain	Theory and practice	100/100	done	didactic-blockchain
Continuous integration	Theory and practice	100/100	done	ci-pipeline
Software engineering	Theory	150/150	done	none
Artificial intelligence and LLMs	Theory and practice	164/164	done	bpe-tokenizer, neural-network-from-scratch, embeddings-vector-search, tiny-language-model, diffusion-toy, pytorch-basics, tensorflow-keras-basics, computer-vision-cnn