I’m looking for an engineer who can build a full Android-based operating system for a new line of mobile devices. This goes well beyond theming or app-level tweaks—I need the entire stack compiled, optimized and ready to flash on prototype hardware. Here’s the scope in plain terms • Port and configure the latest stable Android source to our device’s chipset (Qualcomm Snapdragon 7-series). • Integrate all required low-level drivers supplied by the hardware vendor—camera, modem, GPU and power management must work flawlessly. • Apply security hardening at kernel and SELinux levels, keeping Google CTS compliance in mind so we can pass certification later on. • Deliver a clean build environment (AOSP + proprietary blobs) and a reproducible build script so my in-house team can generate future releases on their own. • Produce a flashable image, recovery partition and OTA update package, each validated on at least two reference phones. Acceptance criteria 1. The OS boots to home screen with no kernel panics. 2. Cellular, Wi-Fi, Bluetooth, GPS, camera and fingerprint sensor operate reliably. 3. Battery life within 5 % of stock Android on identical hardware. 4. CTS tests reach pass state; any remaining failures documented with remediation plan. 5. Full source tree and build instructions compile from scratch on Ubuntu 22.04 without manual patching. If you’ve previously shipped custom ROMs, modified AOSP or worked directly with board support packages, you’ll feel right at home. Let’s discuss your approach and timeline; I’m ready to start as soon as you are.