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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Embedded C Developer - **Company:** TekWissen LLC - **Location:** Englewood, CO, United States - **Experience:** Expert - **Salary:** $136,300.0 - $170,300.0 - **Contract:** Temporary contract - **Skills:** C (Programming Language), Mobile Broadband Modems, LTE (Telecommunication), ARM Architecture, Unit Testing, Bash Shell, Cable Modem, Cloud Computing, Cloud Computing Security, Code Review, Computer Networks, Modems, Software Debugging, Linux, File Systems, Memory Management, Embedded C, Linux on Embedded Systems, Failover, Firmware, Protocol Buffers, Internet Protocol Security (IP SEC), IPv4, IPv6, Virtual Private Networks (VPN), Python (Programming Language), Linux Kernel, Message Queuing Telemetry Transport (MQTT), Network Configuration and Change Management, Routing, OpenSSL, Package Management Systems, PCI Express, Performance Tuning, X.509, Broadcom, Memory Leaks, Shell Script, Subsystems, Tcpdump, Wi-Fi Technology, Transport Layer Security, Data Storage Management, Cloud Platform System, State Machines, Gitlab, Git, Openwrt, Event Driven Architecture, Build Management, Gitlab-ci, Iptables, Build Tools - **Published:** October 4, 2026 - **Apply:** https://www.careerjet.com/jobad/us62ada2b76e7ce8b8c688d4493af563bf ## About the Role * 5+ years of embedded C development on Linux-based platforms. * Strong proficiency in C programming, memory management, IPC, and event-driven architectures. * Experience with OpenWrt build systems, package management, UCI configuration, and JFFS2/SquashFS overlay file systems. * Familiarity with OpenSync, OVSDB, Protobuf, and MQTT telemetry. * Experience with cellular modem integration using AT commands, QMI, and WWAN interfaces. * Strong understanding of Linux networking, routing tables, IPv4/IPv6 dual-stack networking, DHCPv4, DHCPv6, SLAAC, and prefix delegation. * Understanding of TLS mutual authentication using X.509 certificates. * Knowledge of GRE tunneling, IPsec, VPN overlays, and secure encapsulation technologies. * Experience with event loop frameworks such as libev or libuv. * Proficiency with debugging tools including GDB, strace, tcpdump, kernel logs, and serial consoles. * Familiarity with Git, GitLab CI/CD, and cross-compilation toolchains. * Understanding of WiFi standards including 802.11ax and 802.11be. Preferred Skills * Experience with Qualcomm IPQ series SoCs including IPQ5018 and IPQ9574. * Experience with Broadcom BCM series chipsets including BCM4908, BCM6750, and BCM63178. * Knowledge of Atheros, Qualcomm, and Broadcom wireless driver architectures. * Experience with DOCSIS cable modem environments. * Experience with PCIe and USB subsystems in embedded Linux. * Familiarity with eSIM and eUICC provisioning technologies. * Experience with NR5G NSA/SA and carrier aggregation. * Understanding of TR-069 and TR-369 (USP) device management protocols. * Familiarity with TR-181 data models. * Experience with Kconfig-based build environments. * Knowledge of flash storage management, wear leveling, and factory reset processes. * Familiarity with thermal and power management for embedded platforms. ## Description We are seeking an Embedded C Developer to work on next-generation residential gateway platforms that combine DOCSIS/Fiber WAN connectivity with LTE/5G cellular backup. The role involves developing and maintaining firmware on OpenWrt-based hardware running the OpenSync framework, supporting millions of deployed customer premises equipment (CPE) devices. Responsibilities * Design, develop, and debug embedded C software for Linux-based residential gateway platforms (ARM/MIPS SoCs). * Develop and maintain OpenSync managers that interact with OVSDB for cloud-managed configuration and state reporting. * Implement and optimize LTE/5G cellular failover and fallback logic, including modem management, route arbitration, and WAN health checks. * Develop LED state machine logic for multi-WAN connectivity scenarios. * Interface with cellular modems using AT commands, QMI/MBIM, USB, and PCIe (MHI) protocols. * Work with WiFi drivers (Qualcomm/Broadcom/Atheros) for 2.4GHz, 5GHz, and 6GHz radio configuration. * Debug kernel-level issues including PCIe enumeration, USB device management, network driver crashes, and kernel panics. * Implement and maintain secure communication channels using TLS with mutual authentication and tunneling protocols. * Analyze and resolve field issues using device logs, crash dumps, and remote diagnostics. * Develop init scripts, UCI configuration handlers, and persistent storage management for OpenWrt. * Write unit tests and participate in code reviews through GitLab merge requests. * Collaborate with hardware teams, QA, cloud platform engineers, and service provider partners., * Embedded C Development on Linux/OpenWrt. * OpenSync/OpenWrt Platform Development. * Linux Networking & LTE/5G Cellular Integration. Additional Details * Team Size: 8. * Direct Reports: None. * Strong hands-on experience developing OpenSync-based OpenWrt gateway firmware with LTE/5G cellular failover, combining deep Embedded C expertise, Linux networking, and cloud-managed CPE platforms. Tools & Technologies * C. * Shell Scripting (sh/bash). * Python. * OpenWrt. * Linux Kernel 5.x/6.x. * ARM Cortex-A53/A73. * OpenSync. * OVSDB. * libev. * protobuf-c. * jansson. * Qualcomm IPQ. * Broadcom BCM. * Atheros/QCA. * iproute2. * iptables. * nftables. * hostapd. * wpa_supplicant. * GRE. * IPsec. * OpenSSL. * mbedTLS. * X.509 Certificates. * TLS 1.2 / TLS 1.3. * MQTT. * QMI. * MHI. * Make. * Kconfig. * GDB. * Valgrind. * Git. * GitLab. What You'll Work On * Cellular failover and fallback state machines with sub-second transition handling. * LED indication logic for multi-WAN connectivity states. * Modem health monitoring and subsystem restart/recovery. * Internet reachability health-check frameworks. * Cloud-managed device configuration and telemetry reporting via MQTT. * Secure cloud connectivity using mTLS and X.509 certificate-based mutual authentication. * GRE tunnel management for cloud-redirected traffic. * Factory reset, firmware upgrades, and persistent storage management. * IPv4/IPv6 network configuration, routing, and failover across DOCSIS and LTE interfaces. * WiFi radio configuration and performance optimization across Qualcomm and Broadcom platforms. * Kernel crash analysis and driver-level bug resolution. Years of Experience * 14 Years of Experience. TekWissen Group is an equal opportunity employer supporting workforce diversity.