About

Decaf Blog is a working notebook for engineering in the open: data pipelines, CLI tooling, reverse engineering, SEO, and the systems glue that keeps production boring.

Posts stay short, concrete, and reference-friendly. Prefer a command you can paste, a release note that matters operationally, or a technique you can reuse next week over long theory.

• Data engineering — ETL/ELT, schedulers, CDC, batch and streaming, connectors, warehouse and lakehouse plumbing
• Open-source tooling — release notes and change digests for tools we actually run (Airflow, n8n, dbt, ingestr, Dagster, and friends)
• CLI and systems — bash, curl, wget, dig, SFTP, SSL, DNS, automation scripts you keep bookmarked
• Reverse engineering — protocols, binary formats, undocumented APIs, traffic analysis, and how black boxes really behave
• SEO and web discovery — crawlability, indexing signals, structured data, sitemaps, content structure, and how search engines see a site
• Web and HTTP — user agents, downloads, scraping hygiene, headers, caching, and practical HTTP debugging

• Operator-first — what broke, what changed, what to check
• Copy-paste ready — commands, configs, and examples that run
• Scoped — one problem per post when possible; no filler intros
• Honest about limits — trade-offs and “this does not fix X” called out

• All posts — newest first
• Tags — by topic
• Search — full-text via Pagefind

• Email: decaf200 [at] decaf200.com
• Alt email: decaf [at] decaf200.com
• XMPP: decaf200com [at] xmpp.jp

Questions, corrections, and topic requests welcome.