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Changelog

All notable corrections, clarifications, and updates to SEO for Engineers are documented here. The format follows Keep a Changelog, adapted for a book's errata log.

[Unreleased]

Nothing yet.

[2.0.0] - 2026

Volume 1, Code and Craft, is feature-complete.

All 19 chapter directories under volume-1-code-and-craft/ ship production-grade repository materials matched to the chapter prose: scripts, tests, reference implementations, SQL queries, citations, and team document templates. The 2.0 cut marks the milestone where the book and its repository are operationally interchangeable: any code block in the manuscript that is worth running in production has a tested, packaged version in this repository.

Total artifact count at 2.0:

  • 19 chapter directories under volume-1-code-and-craft/
  • 47 standalone scripts (Python, TypeScript, JavaScript, Bash)
  • 12 SQL reference files for BigQuery and DuckDB analytics
  • 9 test suites (pytest, Node test runner)
  • 1 responsibility matrix template (Chapter 19)
  • 1 top-level CITATIONS.md with primary sources for every chapter
  • 1 LICENSE applying uniformly across all chapter materials

No content has been removed at 2.0. All previous 1.x release entries are preserved below.

Volume 2, Systems and Operations, begins next.

[1.18.0] - 2026

Added repository materials for Chapter 19, APIs, Headless Architecture, and SEO. With this release, all 19 chapter directories are shipped and Volume 1, Code and Craft, is feature-complete.

  • New: volume-1-code-and-craft/chapter-19-headless/ directory with canonical_helper.ts (the productized computeCanonical helper from section 19.4, with tests), product_schema.tsx (the JSON-LD pattern from section 19.5 as a React component, with tests), headless_seo_audit.py (the Chapter 19 diagnostics checklist as a runnable script), cms_contract_validator.py (schema-drift detection for headless CMS APIs), and responsibility_matrix.md (the section 19.3 matrix as a forkable team document), plus a requirements.txt and chapter README.
  • Updated: CITATIONS.md with Chapter 19 primary sources, including Google's JavaScript SEO basics, soft 404 documentation, URL Inspection tool, structured data introduction, Schema Markup Validator, Rich Results Test, schema-dts, and the Next.js generateMetadata and notFound documentation.
  • Updated: volume-1-code-and-craft/README.md. All 19 chapters are now marked shipped. Volume 1 is feature-complete.

[1.17.0] - 2026

Added repository materials for Chapter 18, Log File Analysis for Backend Engineers.

[1.16.0] - 2026

Added repository materials for Chapter 17, Faceted Navigation.

[1.15.0] - 2026

Added repository materials for Chapter 16, Crawl Budget.

[1.14.0] - 2026

Added repository materials for Chapter 15, robots.txt, The Specification Engineers Should Actually Read.

[1.13.0] - 2026

Added repository materials for Chapter 14, Sitemaps as a Backend Responsibility.

[1.12.0] - 2026

Added repository materials for Chapter 13, HTTP Fundamentals for SEO.

[1.11.0] - 2026

Added repository materials for Chapter 12, URL Design as an Engineering Discipline.

[1.10.0] - 2026

Added repository materials for Chapter 11, Internationalization and Multilingual SEO Engineering.

[1.9.0] - 2026

Added repository materials for Chapter 10, Internal Linking as a Graph Problem.

[1.8.0] - 2026

Added repository materials for Chapter 9, Structured Data at Scale.

[1.7.0] - 2026

Added repository materials for Chapter 8, Meta Tags, Canonical Tags, and Head Management.

[1.6.0] - 2026

Added repository materials for Chapter 7, Semantic HTML and Information Architecture for Machines.

[1.5.0] - 2026

Added repository materials for Chapter 6, Core Web Vitals as an Engineering Discipline.

[1.4.0] - 2026

Added repository materials for Chapter 5, JavaScript Rendering and the Crawlability Challenge.

[1.3.0] - 2026

Added repository materials for Chapter 4, Ranking Signals That Engineering Controls.

[1.2.0] - 2026

Added repository materials for Chapter 3, Indexing, Canonicalization, and Duplicate Detection.

[1.1.0] - 2026

Added repository materials for Chapter 2, The Rendering Pipeline.

[1.0.0] - 2026

Initial release. Repository materials for Chapter 1, Crawling as a Distributed System.