Modem Firmware Engineer

Ericsson•Boise, ID

3d•Onsite

About The Position

Design, develop, and integrate cellular modem modules into OpenWrt-based platforms. Own the end-to-end modem stack development, including kernel drivers, user-space daemons, and network configuration, ensuring reliable connectivity, seamless failover, and optimal throughput across 5G cellular.

Requirements

5+ years experience in modem integration across multiple chipset vendors, embedded Linux development
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

Nice To Haves

Experience with Qualcomm SDX55/SDX62/SDX65/SDX72 based modules
Experience with Quectel or Telit Wireless modules
OpenWrt procd/ubus/UCI framework expertise
ModemManager or custom connection manager development
Multi-WAN and WAN failover implementation (mwan3)
IPv4/IPv6 dual-stack configuration over cellular
VPN integration over cellular links (WireGuard, OpenVPN, IPsec)
eSIM/eUICC provisioning and profile management
WWAN power management and thermal throttling
Carrier aggregation and band locking configuration
GobiNet/qmi_wwan/mhi driver development
Device tree overlay creation for modem hardware

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 team 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 HMO option through Kaiser for California employees
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
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
Opportunity for an annual bonus