Sr Modem Firmware Engineer

Experteer Overview In this role you will design, develop, and integrate 5G modem modules into OpenWrt-based platforms, owning the end-to-end modem stack for reliable connectivity and optimal throughput. You will work closely with hardware and software teams to deliver robust solutions on OpenWrt-based routers and gateways. Your impact spans kernel drivers, user-space daemons, and network configuration to enable seamless failover and performance across networks. This is a hands-on, impact-driven position in a collaborative, merit-based culture. Compensation / Benefits * Integrate 5G modem modules into OpenWrt-based routers and gateways * Develop and maintain kernel drivers for modem interfaces (USB, PCIe) * Implement and optimize QMI/RMNET/AT command interfaces for modem control * Configure network interfaces, routing policies, and failover mechanisms * Create and manage connection management daemons for automatic reconnection and band selection * Integrate SMS, GPS/GNSS, and voice functionality where applicable * Optimize data throughput and latency across modem interfaces * Perform modem firmware updates (FOTA) and version management * Debug connectivity issues across RF, baseband, driver, and user-space * Collaborate with hardware teams on antenna design validation and RF performance * Create integration documentation and developer guides Tasks * 4+ years in embedded Linux development * 2+ years with OpenWrt or similar distributions * 2+ years integrating cellular modems (preferred: 5+ years across multiple chipset vendors) * Linux kernel development: driver development, device tree, kernel modules * OpenWrt/LEDE build system and package development * Cellular modem integration: QMI, RMNET, AT commands * USB/PCIe modem interface drivers * C/C++ programming for embedded Linux * Cross-compilation toolchains and embedded build systems * Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or related field (Master’s preferred) Key requirements * subsidized health benefits including HSA * 401(k) with 4% company match * paid time off including vacation, holidays, and parental leave * life and AD&D insurance * disability benefits * employee assistance program

development: where applicable * Optimize data throughput and latency across modem interfaces * Perform modem firmware updates (FOTA) and version management * Debug connectivity issues across RF, baseband, driver, and user-space * Collaborate with hardware teams on antenna design validation and RF performance * Create integration documentation and developer guides Tasks * 4+ years in embedded Linux development * 2+ years with OpenWrt or similar distributions * 2+ years integrating cellular modems (preferred: 5+ years across multiple chipset vendors) * Linux kernel development: driver development, device tree, kernel modules * OpenWrt/LEDE build system and package development * Cellular modem integration: QMI, RMNET, AT commands * USB/PCIe modem interface drivers * C/C++ programming for embedded Linux * Cross-compilation toolchains and embedded build systems * Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or related field (Master’s preferred) Key a development * subsidized health benefits including HSA * 401(k) with 4% company match * paid time off including vacation, holidays, and parental leave * life and AD&D insurance * disability benefits * employee assistance program