# codecrafters-io/build-your-own-x

Master programming by recreating your favorite technologies from scratch.

Repository: https://github.com/codecrafters-io/build-your-own-x
Canonical: https://ross.abutalabs.com/products/build-your-own-x
Homepage: https://codecrafters.io
Language: Markdown
License Family: other
Topics: programming, tutorials, tutorial-code, tutorial-exercises, free, awesome-list
Last push: 2026-07-14T19:25:58+00:00

## Health v2 (maintenance only)
Score: 74/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 92, release rhythm 35, longevity 100
- inputs: {"age_days": 3038, "days_push": 50, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 543212, forks 51225 (observed 2026-08-28T04:12:29.176530+00:00)

## What it is
A curated awesome-list repository compiling step-by-step guides for recreating popular technologies (databases, shells, compilers, renderers, etc.) from scratch. It is maintained by CodeCrafters and serves as a free companion resource to their hands-on programming challenges.

## Use cases
- find tutorials to build a database from scratch
- learn how git works by implementing it
- build your own programming language or interpreter
- find a guide to write a toy operating system
- learn networking by building a TCP stack or web server
- find free step-by-step guides for deep learning fundamentals
- recreate redis or docker to understand internals

## When to choose
- you learn best by building things from scratch
- you want free, curated, community-vetted tutorial links across many technologies
- you want to go deep on how everyday tools work internally
- you need project ideas for portfolio-building or interview prep

## When to avoid
- you need structured courses with automated feedback and grading rather than links
- you want a library or tool to install and use in production
- you are a complete beginner looking for a single linear curriculum
- you need officially maintained documentation for a specific technology

## Facets
- artifact type: learning-resource
- maturity: active
- function: developer-tools, documentation
- domain: tutorials, developer-tools, awesome-lists, education
- platform: cross-platform
- tags: awesome-list, tutorials, learn-by-building, step-by-step-guides, free-resources, curated-list

## Member repositories
- codecrafters-io/build-your-own-x (main) score 74

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:29.176530+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:10:09.522104+00:00, confidence not recorded.
  - readme: https://github.com/codecrafters-io/build-your-own-x (fetched 2026-08-28T04:12:29.176530+00:00, sha 7fd00c7aab97)
  - homepage: https://codecrafters.io (fetched 2026-08-28T17:20:27.757460+00:00, sha c5ba31b46cfc)
  - site_page: https://codecrafters.io/about (fetched 2026-08-28T17:20:27.764775+00:00, sha e396e6256716)
  - site_page: https://codecrafters.io/pricing (fetched 2026-08-28T17:20:27.766615+00:00, sha 1423558fa082)
  - site_page: https://app.codecrafters.io/catalog (fetched 2026-08-28T17:20:27.768306+00:00, sha dd90095dace0)
  - site_page: https://app.codecrafters.io/courses/shell/overview (fetched 2026-08-28T17:20:27.769916+00:00, sha ce967a80b024)
  - site_page: https://app.codecrafters.io/courses/redis/overview (fetched 2026-08-28T17:20:27.771747+00:00, sha 66b233f10f34)
  - site_page: https://app.codecrafters.io/courses/claude-code/overview (fetched 2026-08-28T17:20:27.773499+00:00, sha f2e7c250fa5e)
  - site_page: https://app.codecrafters.io/courses/grep/overview (fetched 2026-08-28T17:20:27.774953+00:00, sha dccc8744b49b)
  - site_page: https://app.codecrafters.io/courses/interpreter/overview (fetched 2026-08-28T17:20:27.776557+00:00, sha 7ecd1ab433a9)
- Data as of 2026-08-30T08:39:29.467469+00:00.