https://gerardosaucedo.dev Notes and tutorials on engineering, product, and craft. en https://gerardosaucedo.dev/blog/flutter-devtools-playground https://gerardosaucedo.dev/blog/flutter-devtools-playground Mon, 10 Aug 2026 00:00:00 GMT I built an open-source app that's a menu of screens — each one hides a real performance or memory bug, or looks broken but is healthy by design. A hands-on lab for reading Flutter DevTools frame by frame. Flutter Performance DevTools Memory Open Source https://gerardosaucedo.dev/blog/flutter-performance-false-positives https://gerardosaucedo.dev/blog/flutter-performance-false-positives Mon, 03 Aug 2026 00:00:00 GMT Four States alive when only one is visible. Memory climbing every 400 ms. A red frame on reload. All three look like bugs in DevTools. All three are healthy by design — and knowing that is the senior skill. Flutter Performance DevTools Memory Jank https://gerardosaucedo.dev/blog/aws-choosing-a-region https://gerardosaucedo.dev/blog/aws-choosing-a-region Thu, 30 Jul 2026 00:00:00 GMT Choosing a region isn't a dropdown menu: it commits your latency, your bill, your legal standing, and even which services you can use. AWS AWS Regions Cloud Architecture Latency Compliance https://gerardosaucedo.dev/blog/aws-cloud-at-the-edge https://gerardosaucedo.dev/blog/aws-cloud-at-the-edge Thu, 30 Jul 2026 00:00:00 GMT Edge Locations, Local Zones, Wavelength, and Outposts: four ways to push the cloud closer than any region can reach — all the way into your own building. AWS Edge Computing Local Zones Wavelength Outposts https://gerardosaucedo.dev/blog/aws-global-infrastructure https://gerardosaucedo.dev/blog/aws-global-infrastructure Thu, 30 Jul 2026 00:00:00 GMT How AWS spreads its infrastructure across the world, and what kind of failure can take your application down. AWS Availability Zones Regions Cloud Architecture High Availability https://gerardosaucedo.dev/blog/flutter-performance-memory-leaks https://gerardosaucedo.dev/blog/flutter-performance-memory-leaks Mon, 27 Jul 2026 00:00:00 GMT Dart has a garbage collector, so how can Flutter leak? When something long-lived holds a reference to a State you thought was gone. Three leaks, one rule, and how to catch them in DevTools. Flutter Performance DevTools Memory Dart https://gerardosaucedo.dev/blog/flutter-performance-jank-ui-thread https://gerardosaucedo.dev/blog/flutter-performance-jank-ui-thread Mon, 20 Jul 2026 00:00:00 GMT Typing in a search box stutters. A list lags the moment it opens. Both are jank — but one is your Dart code and the other is the GPU, and DevTools tells them apart. Everything you ship has to fit in 16 milliseconds. Flutter Performance DevTools CPU Profiler Jank https://gerardosaucedo.dev/blog/flutter-performance-rebuilds https://gerardosaucedo.dev/blog/flutter-performance-rebuilds Mon, 13 Jul 2026 00:00:00 GMT A value updates every 500 ms and a grid of cards does work it didn't need to. The problem isn't the counter — it's where the setState lives. A tour of rebuilds with Flutter DevTools, and what the rebuild counter actually means. Flutter Performance DevTools Rebuilds State Management https://gerardosaucedo.dev/blog/flutter-statefulwidget-lifecycle https://gerardosaucedo.dev/blog/flutter-statefulwidget-lifecycle Tue, 21 Oct 2025 00:00:00 GMT You have a widget that should update, but it just won't. Learn how the StatefulWidget lifecycle works — and why yours sometimes won't rebuild. Flutter Dart Mobile StatefulWidget State Management