Principal Modem Engineer

Ericsson•Santa Clara, CA

3d•$234,000 - $292,500

About The Position

Ericsson Enterprise Wireless Solutions is expanding its North American modem engineering team to develop advanced 5G cellular solutions with global Ericsson teams and chipset partners. The Principal Modem Engineer will lead the architecture, development, and integration of cellular modem drivers and eSIM/eUICC provisioning stacks on OpenWrt-based platforms, taking ownership of connectivity from kernel-level USB/PCIe drivers through QMI/RMNET interfaces and eSIM profile lifecycle management. The role also drives technical strategy, engineering practices, and the development of modem and eSIM capabilities across 5G product lines. The engineer will design, develop, and optimize modem host platform software for LGA modules, helping shape platform architecture and deliver high-performance, power-efficient 5G modem solutions. This is a full-time position based in the United States, with priority locations in Boise, Idaho, and Santa Clara, California. Ericsson does not sponsor U.S. work authorization for this position and does not hire F-1 candidates working on CPT or EAD for it.

Requirements

10+ years of experience in embedded Linux, modem, or telecom development.
5+ years of cellular modem driver development experience.
3+ years of eSIM/eUICC integration experience, including GSMA RSP.
3+ years of experience with OpenWrt or similar embedded Linux.
3+ years of technical leadership experience.
Linux kernel modem driver development experience, including USB, PCIe, qmi_wwan, and MHI.
Experience with the OpenWrt/LEDE build system, package development, and platform customization.
Knowledge of eSIM/eUICC architecture and GSMA RSP specifications, including SGP.02, SGP.22, and SGP.32.
Experience with cellular modem control interfaces, including QMI, RMNET, AT commands, and NCM.
Experience with secure element communication, including ISO 7816, APDU, and SCP03.
Proficiency in C/C++ for embedded Linux and real-time systems.
Network stack expertise, including iptables/nftables, iproute2, netifd, routing, and NAT.
Knowledge of PKI infrastructure, certificate management, and secure provisioning.
Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or Telecommunications.

Nice To Haves

Master’s or Ph.D. degree.
Experience with Qualcomm SDX-series modem platforms.
Experience with eUICC vendors.
Experience with CI/CD tooling such as Jenkins, GitLab CI, or GitHub Actions.

Responsibilities

Architect and own the end-to-end modem and eSIM integration stack on OpenWrt platforms.
Design and develop Linux kernel drivers for modem interfaces, including USB, PCIe, and SDIO.
Implement and optimize QMI, RMNET, and AT command layers for modem control and data paths.
Architect and implement a Local Profile Assistant (LPA) for eSIM profile lifecycle management.
Develop secure channel protocols, including SCP03 and SCP80/81, between the platform and eUICC.
Integrate SM-DP+ provisioning flows for remote profile download and activation.
Implement connection management with failover, reconnection, and multi-SIM orchestration.
Drive modem firmware update (FOTA) strategy and implementation.
Lead carrier certification efforts, including GCF and PTCRB, and GSMA compliance, including SAS-UP and SAS-SM.
Define the technical roadmap for next-generation modem and eSIM platform capabilities.
Design and implement CI/CD pipelines and automated test frameworks for modem and eSIM firmware.
Build hardware-in-the-loop (HIL) test infrastructure and automated fleet provisioning workflows.
Establish coding standards, review processes, and architectural guidelines for the team.
Support and develop senior and mid-level engineers in modem driver and eSIM development.
Collaborate with mobile network operators, eUICC vendors, and chipset vendors on interoperability.

Benefits

Competitive employee benefits package.
Annual bonus opportunity through a Short-Term Variable Compensation Plan, subject to eligibility and performance rules.
Subsidized nationwide PPO medical plan options, including a low-deductible Point of Service Plan and a qualifying HDHP with company HSA contribution; California employees also have a subsidized Kaiser HMO option.
Subsidized dental and vision coverage.
401(k) plan with a 4% company match and immediate vesting.
Company-paid basic life and AD&D insurance.
Company-paid disability benefits.
Minimum 15 days of accrued vacation for new employees, 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 prorated based on start date.
Up to 16 weeks of paid maternity leave and 6 weeks of parental or adoption leave at 100% of pay.
Employee Assistance Program.
Mobile therapy.
Paid volunteer time.