A practical tutorial newsletter with short, hands-on coding walkthroughs such as building a terminal color contrast checker, extracting URL parameters with regex, and creating custom Django template tags. Each issue explains the reasoning behind the code and includes working examples a reader can try immediately.
Website: https://www.notdefined.tech/
Scott Mallinson writes engineering notes on building AI tools, API-driven background jobs and system design, drawing lessons from real bugs in his own systems. Readers get concrete, first-hand accounts of failure modes and the reasoning behind fixes, such as hysteresis in batch jobs and keeping constraints in code rather than prompts.
Field notes on security and software engineering, with detailed troubleshooting write-ups on Azure services and web security. Readers get worked debugging stories, local test harness builds, and explanations of modern practices like strict CSP.
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