Principal Modem Engineer

Location: New York

Grow with us 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.

We are looking for an experienced Principal Modem Engineer to lead the architecture, development, and integration of cellular modem drivers and eSIM/eUICC provisioning stacks on Open Wrt-based platforms. In this role, you will own the full modem connectivity stack — from kernel-level USB/PCIe drivers through QMI/RMNET interfaces to eSIM profile lifecycle management. You will drive technical strategy, support the growth of engineering teams, and establish best practices for carrier-grade modem and eSIM deployments across 5G product lines.

This is a full-time position based in the USA.

What you will do:

As a Modem Firmware Principal Engineer – Modem, you will design, develop, and optimize modem host platform software for LGA modules.

This role offers a unique opportunity to influence platform architecture early, take strong technical ownership, and deliver high‑performance, power‑efficient 5G modem solutions at global scale.

Architect and own the end-to-end modem and eSIM integration stack on Open Wrt 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 (SCP
03, SCP
80/81) between the platform and eUICCIntegrate 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

The skills you bring
10+ years in embedded Linux, modem, or telecom development; 5+ years in cellular modem driver development3+ years each with eSIM/eUICC integration (GSMA RSP), Open Wrt or similar embedded Linux, and technical leadership

Linux kernel modem driver development (USB, PCIe, , mhi)
Open Wrt/LEDE build system, package development, and platform customizatione

SIM/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, SCP
03)
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, Git Lab CI, Git Hub Actions) is a plus

Why join Ericsson?

At Ericsson, you´ll have an outstanding opportunity. The chance to use your skills and imagination to push the boundaries of what´s possible. To build solutions never seen before to some of the world’s…