Sr Modem Firmware Engineer

Ericsson•Boise, ID

4d•Onsite

About The Position

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.

Requirements

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 Haves

experience with Qualcomm SDX-series modules
Quectel/Telit modules
ModemManager
VPN integration (WireGuard, OpenVPN, IPsec)
eSIM/eUICC provisioning
multi-WAN failover (mwan3)

Responsibilities

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

Benefits

Subsidized, nationwide PPO medical benefit options including a low-deductible Point of Service Plan and a qualifying High Deductible Health Plan (HDHP), with a generous company-provided HSA contribution.
Subsidized dental and vision coverage.
401(k) plan with a 4% company match and immediate vesting.
Company-paid employee basic life and AD&D insurance.
Company-paid disability benefits.
Minimum of 15 days of accrued vacation.
Up to 3 personal days per year.
11 annual holidays.
8 hours of volunteer time.
80 hours of sick time annually.
Up to 16 weeks of paid maternity leave.
6 weeks of parental or adoption leave at 100% of pay.
Comprehensive Employee Assistance Program.
Mobile therapy.
Volunteer paid time off.