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Android Systems Engineer (6 Months Contract) at Rapsodo. We are building a hardware-software product that deploys Android-based edge devices in commercial environments.. The device operates in a real-time, always-on mode and must perform reliably in production settings, with zero tolerance for failure during active operation.. Most of the surrounding software stack — cloud backend, web dashboards, and mobile applications — is developed with the assistance of AI tooling under close human direction. The edge device hardware layer is the one part of the system where physical iteration on real hardware is required.. Role Overview. You will own the edge device systems layer end-to-end, including:. USB hardware I/O. Custom Android (AOSP) ROM. Device security. Field testing and deployment. You will also review and guide Kotlin application code (including AI-generated output) to ensure correctness, safety, and alignment with system constraints.. Responsibilities . Design, implement, and maintain . USB pipelines (Host & Gadget). , ensuring strict latency and timing requirements. Test, validate, and debug . USB and hardware compatibility issues.  in real-world environments. Build and maintain a . custom Android (AOSP) ROM.  with system-level modifications, including:. Kiosk mode and restricted production environments. Auto-start, watchdog services, and cellular connectivity (APN/modem). OTA updates with staged rollout and rollback. SIM lock and device control mechanisms. Implement and enforce . device security. , including:. Secure boot, locked bootloader, and full-disk encryption. Hardware-backed attestation (Keystore / TEE). Certificate pinning, mTLS, and signed payload verification. Disabling ADB and debug access in production. Define and execute . device provisioning workflows. , including field testing and hardware validation. Develop . hardware specifications and provisioning documentation. Review . Kotlin code.  (including AI-generated output) for correctness, safety, and architectural compliance. Enforce clear separation between . hardware I/O and application logic. Hands-on experience with Android . USB Host mode.  (UsbManager, HID I/O) and/or . USB Gadget mode.  (ConfigFS, /dev/hidg0). Experience building and modifying . custom Android AOSP ROMs from source. Experience implementing . Android kiosk mode. Strong . Kotlin development skills. Experience with Android . security features.  (Keystore, Trusted Execution Environment, hardware-backed keys). Hands-on experience working with . physical devices. , including flashing, testing, and debugging. Experience with . embedded or IoT Android devices.  in production environments is preferred. Understanding of the . Linux USB subsystem.  is preferred. Experience in . commercial or field deployments.  (e.g. retail, payments, kiosk systems) is a plus. Nice to have: experience with POS/payment devices, cellular modem and SIM management, familiarity with backend systems (Node.js), or exposure to Kafka/Flink. This role is suited for someone who enjoys working at the intersection of software and hardware — building, testing, and debugging systems on real devices in real-world environments.. If this aligns with how you like to work, we would like to hear from you.. Company Location: Singapore.