Sr Modem Firmware Engineer

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 orfor 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?
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.

If you need assistance or to request an accommodation due to a disability, please contact Ericsson at

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
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.