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Embedded C Developer OpenSync/OpenWrt WiFi Router with Cellular Backup

ICONMA, LLC

  • Englewood, CO
  • 6 days ago
  • $15.16–$42.85 Per Hour

Highlights

Strong understanding of Linux networking — routing tables, metrics, netfilter, bridge interfaces, IPv4 and IPv6 dual-stack, neighbor discovery, DHCPv4/DHCPv6, SLAAC, and prefix delegation. Knowledge of security and tunneling protocols — GRE tunneling, IPsec, VPN overlays, and secure encapsulation for cloud-managed traffic.

Numbers & Facts

LocationEnglewood, CO
Salary$15.16–$42.85 Per Hour

Description

Our Client, an IT Services and Consultant company, is looking for an Embedded C Developer – OpenSync/OpenWrt WiFi Router with Cellular Backup for their Englewood, CO location.
 
Responsibilities:
  • Design, develop, and debug embedded C software for Linux-based residential gateway platforms (ARM/MIPS SoC)
  • Develop and maintain OpenSync managers — event-driven daemons 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 healthchecks
  • Develop LED state machine logic to provide accurate device status indication across complex multi-WAN scenarios
  • Interface with cellular modems via 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 via GitLab merge requests
  • Collaborate with hardware teams, QA, cloud platform engineers, and service provider partners
 
Requirements:
  • 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
  • Preferred Skills:
  • Experience with Qualcomm IPQ series SoCs (IPQ5018, IPQ9574) and NSS/PPE data path
  • Experience with Broadcom BCM series chipsets (BCM4908, BCM6750, BCM63178) and Memory Direct Engine (MDE) / hardware acceleration
  • Knowledge of Atheros/QCA/BCM wireless chipsets and CFG80211/mac80211 driver architecture
  • Knowledge of DOCSIS cable modem interaction and WAN interface management
  • Experience with PCIe and USB subsystems in embedded Linux (device enumeration, power management, error recovery)
  • Familiarity with eSIM/eUICC provisioning (LPA, GSMA SGP.22)
  • Experience with carrier aggregation, NR5G NSA/SA, and multi-band cellular configurations
  • Understanding of TR-069/TR-369 (USP) device management protocols
  • Basic understanding of TR-181 data model for CPE device management and service configuration
  • Experience with Kconfig-based build configuration
  • Knowledge of flash storage considerations — wear leveling, persistent partitions, factory reset flows
  • Familiarity with thermal management and power management (battery-powered CPE)
  • Tools & Technologies:
  • Languages: C, Shell scripting (sh/bash), Python (test automation)
  • OS/Platform: OpenWrt (Linux 5.x/6.x kernel), ARM Cortex-A53/A73
  • Frameworks: OpenSync, OVSDB, libev, protobuf-c, jansson (JSON)
  • Chipsets: Qualcomm IPQ, Broadcom BCM, Atheros/QCA
  • Networking: iproute2, iptables/nftables, ovsdb-server, hostapd/wpa_supplicant, GRE, IPsec
  • Security: OpenSSL/mbedTLS, X.509 certificates, mTLS, certificate management
  • Cellular: Qualcomm QCM/SDX modems, MHI, qcserial, AT+QENG/AT+COPS
  • Protocols: IPv4, IPv6, DHCPv4/v6, DNS, MQTT, GRE, TLS 1.2/1.3
  • Build: Make, Kconfig, OpenWrt feeds, cross-compilation (musl/glibc)
  • Debug: GDB, valgrind, serial console, logpull analysis
  • VCS/CI: Git, GitLab, merge request workflows
  • Nice to Have:
  • Experience working directly with ISP/MSO/OEM partners
  • Exposure to hardware bring-up and board support package (BSP) development
  • Experience with Agile/Scrum in a firmware development context
  • Familiarity with SCTE/DOCSIS standards
  • Understanding of TR-181 data model parameters for WAN management, WiFi configuration, and device monitoring
  • Experience with GRE tunnel implementation for backhaul traffic in managed WiFi deployments
 
Why Should You Apply?

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