This presentation explores the end-to-end development of a cloud-connected smart lamp ecosystem built using Qt/QML, C++, and AWS ExpressLink.On the device side, a Raspberry Pi Zero running a custom Gentoo Linux installation hosts the embedded Qt application responsible for controlling the lamp and managing secure communication with AWS IoT Core.On the client side, we examine the development of an Android application built with Qt/QML that allows users to control the lamp remotely through AWS.Special attention is given to addressing the Google Play Store’s 16-KB page-size requirement for Android binaries—an issue that affects Qt-based apps and requires specific build-system adjustments.Together, these components demonstrate a practical, maintainable architecture for connecting embedded hardware and mobile clients through AWS IoT, providing actionable insights into cross-platform development, cloud integration, and real-world IoT deployment.