https://elbanic.github.io/series/dev-sentinel/Recent content in Dev Sentinel on Euijun's Personal BlogHugo -- gohugo.ioen-usTue, 03 Mar 2026 12:00:00 +0900https://elbanic.github.io/posts/architecting-dev-sentinel-evolving-failures-into-experience/Tue, 03 Mar 2026 12:00:00 +0900https://elbanic.github.io/posts/architecting-dev-sentinel-evolving-failures-into-experience/<h2 id="architecting-dev-sentinel-evolving-ai-agent-failures-into-reusable-experience">Architecting Dev Sentinel: Evolving AI Agent Failures into Reusable Experience</h2> <video width="100%" controls> <source src="https://elbanic.github.io/videos/sentinel-demo-compressed.mp4" type="video/mp4"> Your browser does not support the video tag. </video> <p>In <a href="https://elbanic.github.io/posts/we-fail-every-day-but-that-failure-becomes-the-success-of-our-next-attempt/">Part I</a>, I explored the philosophy of &ldquo;Struggle Equity&rdquo;: how failures and missteps are the raw materials of senior engineering intuition. AI coding agents like Claude Code iterate at lightning speed, but they lack this long-term architectural intuition.</p> <p>An agent can retry a flawed architectural approach multiple times across different sessions without ever accumulating pattern awareness. It treats every <code>ModuleNotFoundError</code> or infinite recursion as an isolated incident.</p>https://elbanic.github.io/posts/we-fail-every-day-but-that-failure-becomes-the-success-of-our-next-attempt/Wed, 18 Feb 2026 12:00:00 +0900https://elbanic.github.io/posts/we-fail-every-day-but-that-failure-becomes-the-success-of-our-next-attempt/<h2 id="we-fail-every-day-but-that-failure-becomes-the-success-of-our-next-attempt">We fail every day, but that failure becomes the success of our next attempt</h2> <video width="100%" controls> <source src="https://elbanic.github.io/videos/sentinel-demo-compressed.mp4" type="video/mp4"> Your browser does not support the video tag. </video> <blockquote> <p>&ldquo;We fail every day, but that failure becomes the success of our next attempt.&rdquo;</p> </blockquote> <h3 id="failure-repeats">Failure Repeats</h3> <p>Not long ago, a production incident occurred in a service I operate.</p> <p>An SQS-triggered Lambda handler processed a single event that spawned an excessive number of DynamoDB transactions in parallel. Eventually, the Lambda hit its timeout limit.</p>