Sr Modem Firmware Engineer

Ericsson GmbH; San Diego (CA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

401(k) plan with company match

Health, dental, vision coverage

HSA contribution

Job summary

Ericsson is seeking a Senior Modem Firmware Engineer to design, develop, and integrate cellular modem modules into OpenWrt-based platforms in the USA. You will own the end-to-end modem stack—from kernel drivers to user-space daemons and network configuration—to deliver reliable connectivity, failover, and high throughput across 5G networks.

The role requires 4+ years in embedded Linux with OpenWrt experience, 2+ years in modem integration, and strong C/C++ skills.

Qualifications

• 4+ years in embedded Linux development with emphasis on networking.
• 2+ years with OpenWrt or similar distributions.
• 2+ years integrating cellular modems across chipsets.
• Experience with Linux kernel drivers, device trees and modules.
• OpenWrt build system and package development experience.
• Cellular modem integration using QMI/RMNET/AT commands.
• Bachelor’s degree in EE/CE/CS (Master’s preferred).
• Nice to have: SDX/QMI/VPN/eSIM or multi-WAN experience.

Responsibilities

• Integrate 5G modem modules into OpenWrt-based router platforms.
• Develop and maintain kernel drivers for modem interfaces (USB, PCIe).
• Implement QMI/RMNET/AT interfaces for modem control.
• Configure network interfaces, routing, and failover policies.
• Develop daemons for connection management and band selection.
• Integrate SMS, GPS/GNSS, and voice features where applicable.
• Optimize throughput and reduce latency across modem paths.
• Perform firmware updates and version management (FOTA).
• Debug end-to-end connectivity across RF, baseband, and user-space.
• Collaborate with hardware on RF validation and antenna design.
• Create integration docs and developer guides.

Skills

Embedded Linux

OpenWrt/LEDE

Modem integration

Linux kernel development

C/C++ programming

Cross-compilation

USB/PCIe drivers

Networking configurations

Education

Bachelor's in Electrical/Computer Engineering or CS

Master's preferred

Tools

OpenWrt build system

GCC cross-compiler

Device tree

Job description

Grow with us

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)

Why join Ericsson?

At Ericsson, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build solutions never seen before to some of the world’s toughest problems. You´ll be challenged, but you won’t be alone. You´ll be joining a team of diverse innovators, all driven to go beyond the status quo to craft what comes next.

Ericsson uses a merit-based hiring approach that values people with different experiences, perspectives and skillsets. We truly believe this approach drives innovation, which is essential for our future growth. We encourage people from all backgrounds to apply and realize their full potential as part of our Ericsson team.

Ericsson is proud to be an Equal Opportunity employer, learn more.

If you need assistance or to request an accommodation due to a disability, please contact Ericsson at [e-mail].

DISCLAIMER: The above statements are intended to describe the general nature and level of work being 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 country and city: United States (US) || Boise (ID) (Country/ City)

Job details: Developer

Compensation and Benefits at Ericsson

Your Pay

The salary range for this position is dependent on various factors including, but not limited to, location, and the candidate’s combination of job-related knowledge, qualifications, skills, education, training, and experience.

Short-Term Variable Compensation Plan

Your pay also includes the opportunity for an annual bonus. Actual bonus payouts are based on performance of the business against the unit’s objectives, individual performance, and the individual bonus target. Certain eligibility and pro-ration rules apply.

Your Health

• 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. For California employees, we offer a subsidized HMO option through Kaiser. Ericsson Enterprise Wireless Solutions also offers subsidized dental and vision coverage.

Your Financial Security

• Our 401(k) plan has a 4% company match and immediate vesting.
• Employees will also receive company-paid employee basic life and AD&D insurance and company-paid disability benefits.

Your Time

• New employees are provided a minimum of 15 days of accrued vacation, up to 3 personal days per year, 11 annual holidays, 8 hours of volunteer time, and 80 hours of sick time annually. Please note paid time off is pro-rated based on the employee’s start date.
• Furthermore, Ericsson provides up to 16 weeks of paid maternity leave and 6 weeks of parental or adoption leave at 100% of pay.

Additional Benefits

• Ericsson Enterprise Wireless Solutions offers other company-paid benefits such as a comprehensive Employee Assistance Program, mobile therapy, and volunteer paid time off.