Sr Modem Firmware Engineer

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Sr Modem Firmware Engineer

San Diego, California, United States

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Job description

Company and benefits

Job ID

785279

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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.

What happens once you apply? Click Here to find all you need to know about what our typical hiring process looks like.

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.

DISCLAIMER: The above statements are intended to describe the general nature and level of work being performed by employees in 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