/tags/arc42/Recent content in Arc42 on Santiago Hurtado | System ArchitectHugoen-usSun, 17 May 2026 17:40:37 +0200/posts/engineering-outcomes-shared-responsibility/Sun, 17 May 2026 17:40:37 +0200/posts/engineering-outcomes-shared-responsibility/<h2 id="the-isolation-pattern" class="relative group">The Isolation Pattern <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100"><a class="group-hover:text-primary-300 dark:group-hover:text-neutral-700" style="text-decoration-line: none !important;" href="#the-isolation-pattern" aria-label="Anchor">#</a></span></h2><p>Engineers are trained to execute. You get user stories, requirements, and acceptance criteria, then deliver against them. The system should handle X concurrent users, scale to Y nodes, and respond in under Z milliseconds. Those are real constraints, and meeting them takes serious work.</p> <p>But here is the question nobody asks enough: how many devices in the field are actually running the latest version, and how many users actively use what we built? What does success look like for the product, not just for the current sprint?</p>