Senior Embedded C Engineer - Linux, OpenWrt & LTE/5G

IPolarity

Englewood (CO)

On-site

USD 110,000 - 170,000

Full time

7 hours ago

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Job summary

IPolarity seeks an experienced Embedded C Developer to design, implement, and debug software for Linux-based residential gateway platforms on ARM/MIPS SoCs. You will work on OpenWrt/OpenSync, OVSDB, TLS/mTLS security, and LTE/5G modem integration, with hands-on debugging of kernel-level issues and networking tasks in an onsite Englewood, Colorado environment.

You will collaborate with hardware, QA, cloud, and service provider teams; contribute to unit tests, CI pipelines, and maintain stable

Qualifications

5+ years of embedded C development on Linux.
OpenWrt build system, package management, UCI configuration, and JFFS2/SquashFS.
OpenSync, OVSDB, protobuf, and MQTT telemetry.
Linux internals and embedded Linux debugging.
LTE/5G cellular modem integration using AT commands, QMI/MBIM, and rmnet/wwan.
Strong Linux networking knowledge including routing, metrics, netfilter, bridges, IPv4/IPv6, DHCPv4/DHCPv6, SLAAC, and prefix delegation.
TLS/mTLS, X.509 certificates, certificate validation, and secure provisioning.
GRE, IPsec, VPN overlays, and secure encapsulation.
Event-loop frameworks such as libev, libuv, or similar.
GDB, strace, tcpdump, kernel logs, serial console, and related debugging tools.
Git, GitLab CI/CD, and cross-compilation toolchains.
WiFi standards and wireless driver configuration.
C, Shell scripting, and Python for test automation.
OpenWrt/Linux 5.x/6.x and ARM-based embedded platforms.

Responsibilities

Design, develop, and debug embedded C software for Linux-based residential gateway platforms using ARM/MIPS SoCs.
Develop and maintain OpenSync managers and event-driven daemons interacting with OVSDB.
Implement LTE/5G cellular failover and fallback logic, modem management, route arbitration, and WAN health checks.
Develop LED state-machine logic for multi-WAN connectivity scenarios.
Integrate cellular modems using AT commands, QMI/MBIM, USB, and PCIe/MHI.
Work with WiFi drivers for 2.4/5/6 GHz configurations.
Debug kernel-level issues including PCIe enumeration, USB management, driver crashes, and kernel panics.
Implement secure communication channels using TLS/mTLS, X.509 certificates, GRE, and IPsec.
Analyze field issues using device logs, crash dumps, and remote diagnostics.
Develop OpenWrt init scripts, UCI configuration handlers, and persistent storage management.
Write unit tests and participate in GitLab merge request/code review processes.
Collaborate with hardware, QA, cloud platform, and service provider teams.