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# Embedded C Developer

- **Company:** Tech3pillars Technologies
- **Location:** Denver, CO, United States
- **Experience:** Expert
- **Salary:** $136,300.0 - $170,300.0
- **Contract:** Permanent contract
- **Skills:** C (Programming Language), Mobile Broadband Modems, LTE (Telecommunication), Cloud Computing, Computer Networks, Modems, Software Debugging, Linux, Memory Management, Embedded C, Failover, Protocol Buffers, Internet Protocol Security (IP SEC), IPv4, IPv6, Virtual Private Networks (VPN), Linux Kernel, Message Queuing Telemetry Transport (MQTT), Network Interface, Routing, Package Management Systems, X.509, Tcpdump, Encapsulation (Networking), Wi-Fi Technology, Git, Openwrt, Event Driven Architecture, Gitlab-ci
- **Published:** September 17, 2026
- **Apply:** https://www.careerjet.com/jobad/us86e79fa37074bc8c6fce1854dc4e8282

## About the Role

5+ years of embedded C development on Linux-based platforms
Strong proficiency in C programming - pointers, memory management, IPC, event-driven architectures
Experience 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 and IPv6 dual-stack, neighbor discovery, DHCPv4/DHCPv6, SLAAC, and prefix delegation
Understanding of TLS handshake with mutual authentication using X.509 certificates, certificate chain validation, and secure provisioning
Knowledge of security and tunneling protocols - GRE tunneling, IPsec, VPN overlays, and secure encapsulation for cloud-managed traffic
Experience with event loop frameworks (libev, libuv, or similar)
Proficiency with debugging tools - GDB, strace, tcpdump, kernel logs, serial console
Familiarity with Git, GitLab CI/CD, cross-compilation toolchains
Understanding of WiFi standards (802.11ax/be) and wireless driver configuration
Top Skills:

 1. Embedded C Development on Linux/OpenWrt
o C programming, Linux internals, debugging, IPC, event-driven design

 2. OpenSync/OpenWrt Platform Development
o OpenSync Managers, OVSDB, UCI, MQTT, OpenWrt build system

 3. Linux Networking & LTE/5G Cellular Integration
o Routing, IPv4/IPv6, failover, QMI/MBIM, modem management, GRE/IPsec



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