Embedded C Developer – OpenSync/OpenWrt WiFi Router with Cellular

Role: Embedded C Developer – OpenSync/OpenWrt WiFi Router with Cellular

Location: Denver, CO (4 days onsite/week)

Required Skills• 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