Senior Modem Firmware Engineer - 5G OpenWrt

Ericsson Inc. does not sponsor U.S. work authorizations for this job position, including U.S. immigration filings for initial and/or change of employer paperwork for H-1’s, H-1B1’s, E-3’s, O-1’s, and TN’s. Ericsson also does not hire F-1’s working on CPT or EAD for this position. About This Opportunity Join Ericsson as a Senior Modem Firmware Engineer based in the USA, where you will design, develop, and integrate cellular modem modules into OpenWrt-based platforms. You will own the end-to-end modem stack — spanning kernel drivers, user-space daemons, and network configuration — to deliver reliable connectivity, seamless failover, and optimal throughput across 5G cellular networks. What You Will Do Integrate 5G modem modules into OpenWrt-based router and gateway platforms Develop and maintain kernel drivers for modem communication interfaces (USB, PCIe) Implement and optimize QMI/RMNET/AT command interfaces for modem control Configure network interfaces, routing policies, and failover mechanisms Implement connection management daemons for automatic reconnection and band selection Integrate SMS, GPS/GNSS, and voice functionality where applicable Optimize data throughput and reduce latency across modem interfaces Perform modem firmware updates (FOTA) and version management Debug connectivity issues across the full stack (RF, baseband, driver, user‑space) Collaborate with hardware teams on antenna design validation and RF performance Create integration documentation and developer guides The Skills You Bring 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 systems Cross-compilation toolchains and embedded build systems Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or related field (Master’s preferred) Nice to have: experience with Qualcomm SDX-series modules, Quectel/Telit modules, ModemManager, VPN integration (WireGuard, OpenVPN, IPsec), eSIM/eUICC provisioning, or multi-WAN failover (mwan3) Benefits Competitive salary dependent on location, experience, and qualifications Annual bonus opportunity, contingent on business and individual performance Subsidized PPO medical, dental, vision, and HSA benefits 401(k) plan with 4% company match and immediate vesting Company-paid life, AD&D, and disability insurance Paid vacation, personal days, holidays, sick time, and volunteer hours Paid maternity and parental leave up to 16 weeks at 100% pay Employee Assistance Program, mobile therapy, and volunteer paid time off Equal Opportunity Ericsson is an Equal Opportunity employer. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team. Disclaimer The statements above describe the general nature and level of work performed by employees in this position. They are not an exhaustive list of all responsibilities, duties, and skills required for this position, and you may be required to perform additional job tasks as assigned. Primary Location United States (US) – Boise, Idaho #J-18808-Ljbffr Ericsson