Principal Modem Engineer

Overview 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 drives the development of next‑generation enterprise and industrial 5G solutions on advanced cellular chipset platforms. 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 (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. Qualifications 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. Experience with Linux kernel modem driver development (USB, PCIe, qmi_wwan, mhi). OpenWrt/LEDE build system, package development, and platform customization. Knowledge of eSIM/eUICC architecture and GSMA RSP specifications (SGP.02, SGP.22, SGP.32). Familiarity with cellular modem control interfaces (QMI, RMNET, AT commands, NCM). Secure element communication experience (ISO 7816, APDU, SCP03). Proficiency in C/C++ for embedded Linux and real‑time systems. Network stack expertise (iptables/nftables, iproute2, netifd, routing, NAT). Knowledge of 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. Benefits Competitive salary ranging from $232,000 to $292,500 for Santa Clara, CA, with a short‑term variable compensation plan that can include an annual bonus based on performance. In addition, the role offers a comprehensive benefits package including PPO medical coverage, an HMO option through Kaiser for California employees, dental and vision coverage, a 401(k) plan with 4% company match and immediate vesting, company‑paid life and disability insurance, paid maternity and parental leave, vacation and sick time, and other paid time off benefits. Ericsson is an Equal Opportunity Employer. If you need assistance or an accommodation due to a disability, please contact Ericsson at View email address on click.appcast.io . DISCLAIMER: The above statements are intended to describe the general nature and level of work performed by employees in this position. They are not an exhaustive list of all responsibilities, duties, or required skills, and you may be asked to perform additional job tasks as assigned. #J-18808-Ljbffr Ericsson GmbH