Sr Modem Firmware Engineer

Ericsson; Boise (ID); On-site; USD 191,000 - 239,000; Full time

Benefits offered by this job

401(k) match

Health benefits (medical, dental, and視

Paid parental leave

Vacation and holidays

Job summary

Ericsson in Boise, ID and Santa Clara, CA seeks a Senior Modem Firmware Engineer to own the end-to-end modem stack on OpenWrt platforms. You will design, implement, and optimize kernel drivers, user-space daemons, and network configuration for reliable 5G connectivity with seamless failover.

Responsibilities include integrating modems, optimizing interfaces, and performing FOTA updates. A strong background in embedded Linux, OpenWrt, and cellular modems is required.

Qualifications

• 4+ years in embedded Linux development and 2+ years with OpenWrt or similar.
• 2+ years integrating cellular modems; 5+ years across multiple chipsets preferred.
• Bachelor’s degree in Electrical/Computer Engineering or Computer Science.

Responsibilities

• Integrate 5G modem modules into OpenWrt-based router and gateway platforms.
• 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 daemons for connection management and band selection.
• Integrate SMS, GPS/GNSS, and voice functionality where applicable.
• Optimize throughput and reduce latency across modem interfaces.
• Perform modem firmware updates (FOTA) and version control.
• Debug connectivity across RF, baseband, driver, and user-space layers.
• Collaborate with hardware teams on antenna design validation and RF.
• Create integration docs and developer guides.

Skills

Embedded Linux development

OpenWrt/LEDE experience

Cellular modem integration

Linux kernel driver development

C/C++ for embedded

OpenWrt build system

QMI/RMNET/AT interfaces

USB/PCIe modem drivers

Cross-compilation tools

Bachelor’s in EE/CS/CE

Education

Bachelor’s degree in Electrical Engineering, Computer Engineering, or Computer Science

Master’s degree preferred

Job description

Grow with us

Priority is for Boise, ID and Santa Clara, CA

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.

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.

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

At Ericsson, we know that our people are the key to our success. We offer a competitive package to help with your individual needs and goals.

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.

Santa Clara $191,000-239,000k

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

Ericsson Enterprise Wireless Solutions offers excellent, competitive employee benefits, such as: 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

We invest in both your short and long-term financial wellbeing. 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

Your work-life balance is important to us. 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.