Principal Modem Engineer

About this opportunity 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. Ericsson Enterprise Wireless Solutions is expanding its modem engineering team in North America, focused on end‑to‑end development of advanced 5G cellular use cases in collaboration with global Ericsson teams and leading chipset partners. This core team is driving the development of next‑generation enterprise and industrial 5G solutions on advanced cellular chipset platforms. What you will do Architect and own the end‑to‑end modem and eSIM integration stack on OpenWrt platforms Design and develop Linux kernel drivers for modem interfaces (USB/PCIe/SDIO) Implement and optimize QMI/RMNET/AT command layers for modem control and data path Architect and implement a Local Profile Assistant (LPA) for eSIM profile lifecycle management Develop secure channel protocols (SCP03, 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 (GCF, PTCRB) and GSMA compliance (SAS‑UP, 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 on modem driver and eSIM development Collaborate with mobile network operators, eUICC vendors, and chipset vendors for interoperability Skills you’ll bring 10+ years in embedded Linux, modem, or telecom development; 5+ years in cellular modem driver development 3+ years each with eSIM/eUICC integration (GSMA RSP), OpenWrt or similar embedded Linux, and technical leadership Linux kernel modem driver development (USB, PCIe, qmi_wwan, mhi) OpenWrt/LEDE build system, package development, and platform customization eSIM/eUICC architecture and GSMA RSP specifications (SGP.02, SGP.22, SGP.32) Cellular modem control interfaces (QMI, RMNET, AT commands, NCM) Secure element communication (ISO 7816, APDU, SCP03) Proficiency in C/C++ for embedded Linux and real‑time systems Network stack expertise (iptables/nftables, iproute2, netifd, routing, NAT) PKI infrastructure, certificate management, and secure provisioning Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, or Telecommunications (Master’s or Ph.D. preferred) Experience with Qualcomm SDX-series modem platforms, eUICC vendors, and CI/CD tooling (Jenkins, GitLab CI, GitHub Actions) is a plus Location Primary location: United States (US) — Santa Clara Benefits and Compensation Your pay includes a competitive salary. The salary range for this position in Santa Clara, CA is $232,000–$292,500. Short‑Term Variable Compensation Plan: Opportunity for an annual bonus based on performance, eligibility, and pro‑rata rules apply. Health: Subsidized nationwide PPO medical benefit options, low‑deductible Point of Service Plan, High Deductible Health Plan (HDHP) with company‑provided HSA contribution. California employees have a subsidized HMO option through Kaiser. Dental and vision coverage is also subsidized. Financial Security: 401(k) plan with 4% company match and immediate vesting. Company‑paid basic life and AD&D insurance, disability benefits, and other basic life insurance options. Time Off: Minimum 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 leave includes up to 16 weeks of paid maternity leave and 6 weeks of parental or adoption leave at 100% pay. Additional Benefits: Comprehensive employee assistance program, mobile therapy, and volunteer paid time off. 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. Equal Opportunity Statement Ericsson is proud to be an Equal Opportunity employer. Accessibility Accommodations If you need assistance or to request an accommodation due to a disability, please contact Ericsson at View email address on click.appcast.io. #J-18808-Ljbffr Ericsson