Jobs → Engineering → Embedded C Developer

About the Role We are looking for an Embedded C Developer to work on OpenSync/OpenWrt WiFi Router with Cellular. This role requires local presence in Denver, CO with 4 days onsite. Key Responsibilities • Develop embedded C applications for Linux-based platforms • Work with OpenWrt build system, package management, and filesystems • Integrate cellular modems and manage network interfaces • Implement security and tunneling protocols • Debug and troubleshoot embedded systems 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