Principal Modem Engineer
Core
Lead architecture, development, and integration of cellular modem drivers and eSIM/eUICC provisioning stacks on OpenWrt-based platforms for 5G enterprise and industrial solutions.
Role type
Principal Modem Engineer (Embedded Linux/Telecom)
Builds
Next-generation enterprise and industrial 5G solutions on advanced cellular chipset platforms
Domain
Telecommunications / Embedded Systems / 5G
Required skills
Linux kernel driver development (USB/PCIe/SDIO), OpenWrt/LEDE build systems, eSIM/eUICC architecture (GSMA RSP), QMI/RMNET/AT command layers, Secure channel protocols (SCP03/80/81), C/C++ for embedded systems, Network stack (iptables/nftables), CI/CD pipelines, Hardware-in-the-loop testing
Preferred skills
Qualcomm SDX-series modem platforms, eUICC vendor experience, Jenkins/GitLab CI/GitHub Actions
Technologies
Linux, OpenWrt, C, C++, QMI, RMNET, GSMA SGP.02/22/32, ISO 7816, APDU, SCP03, SM-DP+, GCF, PTCRB
Responsibilities
Architect end-to-end modem and eSIM integration stack; Design and develop Linux kernel drivers for modem interfaces; Implement QMI/RMNET/AT command layers; Architect Local Profile Assistant (LPA) for eSIM lifecycle; Develop secure channel protocols; Integrate SM-DP+ provisioning flows; Implement connection management with failover; Drive modem firmware update (FOTA) strategy; Lead carrier certification efforts (GCF, PTCRB); Define technical roadmap for next-gen capabilities; Design CI/CD pipelines and automated test frameworks; Build HIL test infrastructure; Establish coding standards and review processes; Support senior and mid-level engineers; Collaborate with mobile network operators and chipset vendors
Seniority
Principal, hands-on IC with technical leadership
