Senior Embedded C Engineer - Linux/OpenWrt (LTE/5G)

Polluxa, Inc.; Englewood (CO); On-site; USD 120,000 - 180,000; Full time

Job summary

Polluxa, Inc. seeks an experienced Embedded C Engineer to design and debug Linux-based gateway software. You will implement OpenSync components, manage OVSDB interactions, and optimize cellular failover alongside WiFi driver work.

The role requires strong C skills, Linux networking knowledge, and hands-on experience with OpenWrt and cloud-managed CPE frameworks. Expect collaboration with hardware, QA, and cloud teams in a fast-paced environment.

Qualifications

• 5+ years of embedded C development on Linux-based platforms.
• Strong proficiency in C programming — pointers, memory management, IPC, event-driven architectures.
• Familiarity with OpenWrt build system, package management, UCI configuration, and JFFS2/SquashFS overlay filesystems.
• Familiarity with OpenSync or similar cloud-managed CPE frameworks (OVSDB, protobuf, MQTT telemetry).
• Experience with cellular modem integration — AT commands, QMI, network interface management (rmnet/wwan).
• Strong understanding of Linux networking — routing tables, metrics, netfilter, bridge interfaces, IPv4/IPv6 dual-stack, DHCPv4/DHCPv6, SLAAC.

Responsibilities

• Design, develop, and debug embedded C software for Linux-based residential gateway platforms.
• Develop and maintain OpenSync managers and OVSDB interactions.
• Implement LTE/5G cellular failover and modem management.
• Develop LED state machines for device status in multi-WAN scenarios.
• Interface with cellular modems via AT/QMI/MBIM, USB, PCIe.
• Work with WiFi drivers for 2.4/5/6 GHz configurations.
• Debug kernel-level issues and TLS-secured communications.

Skills

Embedded C

Linux programming

Memory management

IPC

Networking fundamentals

TLS authentication

Debugging

Tools

OpenWrt

UCI

JFFS2/SquashFS

GitLab

GDB

tcpdump

Job description

Polluxa, Inc. seeks an experienced Embedded C Engineer to design and debug Linux-based gateway software. You will implement OpenSync components, manage OVSDB interactions, and optimize cellular failover alongside WiFi driver work.

The role requires strong C skills, Linux networking knowledge, and hands-on experience with OpenWrt and cloud-managed CPE frameworks. Expect collaboration with hardware, QA, and cloud teams in a fast-paced environment.