https://caskeycoding.com Technical writing by Eric Caskey on platform engineering, distributed systems, and AI-augmented development. en-us Mon, 04 May 2026 08:05:43 GMT https://caskeycoding.com/blog/when-the-spec-was-wrong https://caskeycoding.com/blog/when-the-spec-was-wrong Sun, 26 Apr 2026 00:00:00 GMT Two weeks after I shipped a post about a scoring engine I'd built, I rewrote the spec it was based on. Here's what I learned, and why I had an AI agent do the literature review. https://caskeycoding.com/blog/one-week-sdd-production-numbers https://caskeycoding.com/blog/one-week-sdd-production-numbers Mon, 20 Apr 2026 00:00:00 GMT The previous two posts made claims. Here is what a week of the workflow looks like as a data trail, PRs, deploys, CI runs, specs merged, pulled from GitHub. https://caskeycoding.com/blog/sdd-is-context-management https://caskeycoding.com/blog/sdd-is-context-management Sun, 19 Apr 2026 00:00:00 GMT Spec-driven development reads like a methodology for controlling AI agents. It isn't. It's a methodology for managing context across stateless sessions. The spec is the persistent memory. https://caskeycoding.com/blog/phone-first-production-from-a-phone https://caskeycoding.com/blog/phone-first-production-from-a-phone Sat, 18 Apr 2026 00:00:00 GMT Two production sites, a blog, and two personal AI projects, shipped this week from a phone. The chain is voice dictation into Perplexity Computer, a spec, then Claude Code on the web. The interaction model is the story. https://caskeycoding.com/blog/building-an-ai-finance-app-graham-aligned-portfolio-review https://caskeycoding.com/blog/building-an-ai-finance-app-graham-aligned-portfolio-review Mon, 13 Apr 2026 00:00:00 GMT How I built a personal financial position reviewer using Python Lambda, multi-agent AI on AWS Bedrock, and Graham's value investing framework, and what I learned building AI applications outside work. https://caskeycoding.com/blog/building-an-ai-marathon-coach-deterministic-rules-llm-narratives-2026-nyc-marathon https://caskeycoding.com/blog/building-an-ai-marathon-coach-deterministic-rules-llm-narratives-2026-nyc-marathon Mon, 13 Apr 2026 00:00:00 GMT How I built a personal AI coaching system for marathon training, layering deterministic guardrails over an LLM narrative engine, ingesting Garmin FIT files, and designing for my own injury history. https://caskeycoding.com/blog/designing-safety-guardrails-for-distributed-workflow-orchestration https://caskeycoding.com/blog/designing-safety-guardrails-for-distributed-workflow-orchestration Fri, 10 Apr 2026 00:00:00 GMT Patterns for pre-execution safety checks, parallel validation, opt-out design, and extensible guardrail architecture on workflow platforms. https://caskeycoding.com/blog/spec-driven-development-and-the-folder-architecture-that-makes-it-work https://caskeycoding.com/blog/spec-driven-development-and-the-folder-architecture-that-makes-it-work Fri, 20 Jun 2025 00:00:00 GMT Why spec-driven development and structured folder architecture are the missing infrastructure for AI-assisted engineering — methodology, common mistakes, and where to start. https://caskeycoding.com/blog/book-review-enterprise-vibe-coding-playbook-building-real-software-with-ai https://caskeycoding.com/blog/book-review-enterprise-vibe-coding-playbook-building-real-software-with-ai Tue, 10 Jun 2025 00:00:00 GMT A practitioner's review of Doug Kerwin's Enterprise Vibe Coding Playbook, why AI as a thinking partner, not a replacement, is the framework enterprise engineering teams need. https://caskeycoding.com/blog/building-multi-region-workflow-orchestration https://caskeycoding.com/blog/building-multi-region-workflow-orchestration Sun, 01 Jun 2025 00:00:00 GMT Designing cross-region workflow orchestration that holds across Dublin, Seattle, San Jose, and New York, self-service platforms, SLA definitions, and AI-native execution infrastructure. https://caskeycoding.com/blog/enterprise-mfa-at-scale https://caskeycoding.com/blog/enterprise-mfa-at-scale Sun, 25 May 2025 00:00:00 GMT How I owned and evolved enterprise MFA platforms serving tens of thousands of employees, from the RSA Self Service Portal to QR Code-based provisioning and mobile authentication. https://caskeycoding.com/blog/how-i-standardized-infrastructure-monitoring-across-an-entire-fleet https://caskeycoding.com/blog/how-i-standardized-infrastructure-monitoring-across-an-entire-fleet Tue, 20 May 2025 00:00:00 GMT How I built and drove adoption of unified monitoring standards across enterprise fleets at Amazon and Prudential, from alerting baselines to org-wide observability. https://caskeycoding.com/blog/welcome-building-platforms-for-scale https://caskeycoding.com/blog/welcome-building-platforms-for-scale Thu, 15 May 2025 00:00:00 GMT An introduction to the blog, reflections on infrastructure monitoring, platform leadership, and building systems that empower organizations to innovate safely at scale.