Sr Modem Firmware Engineer

Ericsson GmbH; San Diego (CA); On-site; USD 191,000 - 239,000; Full time

Benefits offered by this job

401(k) plan with company match

Health insurance and HDHP/HSA options

Generous paid time off and holidays

Parental leave and family benefits

Job summary

Ericsson Inc. is seeking a Senior Modem Firmware Engineer in the USA to design, develop, and integrate cellular modem modules into OpenWrt-based platforms.

You will own the end-to-end modem stack—from kernel drivers to user-space daemons and network configuration—to deliver reliable connectivity and high throughput across 5G networks. The role requires deep expertise in embedded Linux, OpenWrt, and cellular modem integration, with hands-on work on QMI/RMNET/AT command interfaces and

Qualifications

• 4+ years in embedded Linux development
• 2+ years with OpenWrt or similar distributions
• 2+ years integrating cellular modems (5+ years preferred)
• Linux kernel development incl. drivers and device tree

Responsibilities

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

Skills

Embedded Linux

OpenWrt/LEDE

Cellular modem integration

Linux kernel development

C/C++ programming

USB/PCIe drivers

QMI RMNET AT commands

Cross-compilation toolchains

Education

Bachelor’s degree in EE/CE/CS

Master’s degree preferred

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. Location 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.

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

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

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

• 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.
• 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.
• 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

• comprehensive Employee Assistance Program, mobile therapy, and volunteer paid time off.