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# Sr Modem Firmware Engineer

- **Company:** Ericsson
- **Location:** Santa Clara, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Mobile Broadband Modems, C++ (Programming Language), Computer Programming, Computer Engineering, Modems, Software Debugging, Device Drivers, Linux on Embedded Systems, Firmware, Global Positioning Systems (GPS), Internet Protocol Security (IP SEC), Virtual Private Networks (VPN), Linux Kernel, Network Interface, OpenVPN, Package Development Process, PCI Express, Software Defined Everything, Openwrt, Information Technology, Software Version Control, GNSS
- **Published:** August 5, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=90911e4cf9d5142a

## About the Role

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)

## Description

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, 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.


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