Senior Automotive 5G Wireless Software Engineer

Sigma Group; California; On-site; USD 150,000 - 175,000; Full time

Benefits offered by this job

PTO and holidays

401(k) with match

Life insurance

FSA/HSA

Employee Assistance Program

Disability insurance (CA)

Job summary

Sigma Connectivity is seeking a Senior Cellular Software Engineer to own parts of the in-vehicle 5G stack on the telematics platform used across brands. This role is an embedded Linux IC position, collaborating with modem suppliers, carriers, and our cloud connectivity team.

The candidate should have 6+ years in embedded or systems software, strong C++17 on embedded Linux, and experience with carrier integration and 3GPP procedures.

Qualifications

• BS in Computer Science, Electrical or Computer Engineering, or equivalent practical experience.
• 6+ years of embedded or systems software experience, including 3+ years on device-side cellular (LTE/5G) software that shipped in production devices.
• Strong modern C++ (C++17 or later) on embedded Linux: multithreaded services, state machines, IPC, and unit testing with GoogleTest/GoogleMock or similar.
• Host-side modem integration through vendor SDKs, QMI, AT commands, MBIM, or an Android RIL.
• Working knowledge of 3GPP device procedures: attach and registration, PDN/PDU sessions and APN configuration, roaming.
• Linux networking: IPv4/IPv6 dual-stack, policy routing, iptables/nftables, DNS/DHCP, packet capture analysis.
• Experience debugging cellular issues from the field using modem diagnostic logs to root cause.

Responsibilities

• Build and own the vehicle-side eSIM client and VM components integrated with cloud eSIM manager.
• Extend the cellular stack for multi-carrier and multi-region operation with configuration-driven changes.
• Design and maintain C++ services that control modem and data path on embedded Linux across multiple APNs and traffic types.
• Ensure connectivity recovers without user action through detection of stalls, rejects, and out-of-service conditions.
• Own cellular observability and field triage: telemetry, logs, fleet data, and drive defects to resolution with vendors.
• Write design docs and review code for the cellular subteam; mentor engineers and set technical direction.

Skills

C++17+ on embedded Linux

Multithreaded systems

3GPP procedures (attach/registration)

Linux networking IPv4/IPv6

Debugger of cellular issues

Device-side cellular development

Education

BS in CS, EE or CE

Tools

Vendor SDKs

QMI/AT/MBIM

Android RIL

QXDM/QCAT

tcpdump/Wireshark

Yocto/BitBake/Bazel

Job description

Sigma Connectivity is seeking a Senior Cellular Software Engineer to own parts of the in-vehicle 5G stack on the telematics platform used across brands. This role is an embedded Linux IC position, collaborating with modem suppliers, carriers, and our cloud connectivity team.

The candidate should have 6+ years in embedded or systems software, strong C++17 on embedded Linux, and experience with carrier integration and 3GPP procedures.