Sr Modem Firmware Engineer

Ericsson; Santa Clara (CA); On-site; USD 120,000 - 150,000; Full time

Benefits offered by this job

Health insurance

401(k) plan with match

Paid time off

Parental leave

Life and AD&D insurance

Dental and vision coverage

Job summary

Ericsson Inc. is seeking a Senior Modem Firmware Engineer in the United States 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. You will collaborate with hardware teams, optimize performance, and implement robust failover and provisioning features, while mentoring junior engineers

Qualifications

• 4+ years in embedded Linux development; 2+ years with OpenWrt or similar distributions.
• 2+ years integrating cellular modems (prefer: 5+ years across multiple 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).

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.
• 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 full stack (RF, baseband, driver, user-space).
• Collaborate with hardware teams on antenna design validation and RF performance.
• Create integration documentation and developer guides.

Skills

Embedded Linux

OpenWrt

Cellular modems

Linux kernel development

OpenWrt LEDE build

QMI RMNET AT commands

USB PCIe drivers

C/C++

Cross-compilation

Bachelor’s degree (EE/CS)

Education

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

Master’s degree preferred

Tools

Qualcomm SDX-series modules

Quectel/Telit modules

ModemManager

VPN: WireGuard/OpenVPN/IPsec

eSIM/eUICC provisioning

Multi-WAN failover (mwan3)

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.

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.

What happens once you apply?

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

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

• 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

• 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.
• 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,
• volunteer paid time off.