January 2026
- Jan 11, 2026TechnologyAutomation Design Principles for Reliable WorkflowsMost automation failures are not wrong business logic. They are missing error handling, absent monitoring, or design so opaque nobody can diagnose it. This covers the seven principles that prevent that: simplicity, defensive design, observability, error handling, maintainability, testability and efficiency, with the five error patterns worth memorizing and the seven anti-patterns that produce fragile workflows.
- Jan 4, 2026TechnologyUnderstanding the DevOps Culture in Modern TeamsEdmondson's 1999 study of 51 work teams produced a result that reads backwards: higher-performing teams reported more errors, not fewer. They were surfacing problems while weaker teams hid them. That is the mechanism behind blameless post-mortems. Also here: the four DORA metrics and their elite thresholds, Westrum's pathological, bureaucratic and generative culture types, and ING's move from 13 weeks to under 5 weeks time-to-market.
- Jan 1, 2026TechnologyCore DevOps Practices and Their ImplementationOn August 1, 2012 a manual deployment left the previous code active on one of Knight Capital's eight servers. The misconfigured server executed 4 million trades in 45 minutes and the $440 million loss effectively ended the firm. The SEC proceeding found no automated consistency checks, no canary deployment, no automated rollback. This covers the Three Ways, the five core practices, and the DORA metrics that predict delivery performance.
December 2025
- Dec 31, 2025TechnologyIntroducing Reliability Engineering ConceptsOn July 2, 2019, one firewall rule with a backtracking regular expression consumed all CPU on every Cloudflare server worldwide and took the network down for 27 minutes. Cloudflare published a minute-by-minute post-mortem within 48 hours, including the offending expression and nine owned action items. That is reliability engineering in practice: define reliable enough with SLOs, spend the error budget deliberately, turn each incident into named fixes.
- Dec 31, 2025TechnologyInfrastructure as Code: The Future of Server ManagementThe usual culprits were overly permissive security groups, missing encryption and disabled logging, which means IaC systematizes mistakes exactly as reliably as it systematizes good practice. That is the argument for policy as code with Checkov or OPA rather than review alone. The page covers declarative versus imperative tools, the plan-before-apply safety step, state file risks like losing track of running resources, and configuration drift.
- Dec 30, 2025TechnologyThreat Models Explained: Identifying Security RisksAttackers took over high-profile Twitter accounts in 2020 without defeating a single password. Phone-based social engineering of employees who held admin-tool access made account authentication irrelevant, exactly the spoofing and elevation-of-privilege gap a structured pass is meant to surface. This page works through STRIDE, introduced by Praerit Garg and Loren Kohnfelder in 1999, and applies it to a real system.
- Dec 30, 2025TechnologyScaling Cloud Systems: Strategies and PatternsMapping many logical shards onto few physical ones means adding hardware never requires reorganizing the shard layout, which is why the 2012 design became a reference implementation. The page is blunt that adding servers to a poorly designed system just produces a poorly designed system with more servers, and covers load balancing, statelessness, cache invalidation, read replicas and replication lag, queues, and the CAP tradeoff during a partition.
- Dec 28, 2025TechnologyIntegrating Privacy by Design in SystemsApple's App Tracking Transparency made cross-app tracking require explicit permission, with no tracking as the default. Flurry Analytics measured global opt-in at roughly 13 to 14 percent, leaving about 85 percent of iOS users untrackable across third-party apps. Meta disclosed the change cost it $10 billion in 2022 ad revenue. That is what a default is worth. This covers Cavoukian's seven principles, data minimization and the main privacy-enhancing technologies.
- Dec 25, 2025TechnologySecure System Design Principles for Enhanced SecurityJerome Saltzer and Michael Schroeder published eight design principles at MIT in 1975, and nearly fifty years on they remain the foundation, because the underlying challenge has not changed. Secure systems resist attack through how they are structured, not what is bolted on afterward: a castle with walls and a moat beats a house with an alarm. Target's 2013 breach reached payment systems through an HVAC vendor, which network segmentation would have contained.
September 2023
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