{"schemaVersion":"jobsearcher.job.v1","id":"02508ce4657bddf8f139346f","url":"https://jobsearcher.com/jobs/02508ce4657bddf8f139346f","canonicalUrl":"https://jobsearcher.com/jobs/02508ce4657bddf8f139346f","title":"Embedded C Developer – OpenSync/OpenWrt","description":"Embedded C Developer – OpenSync/OpenWrtWe are seeking an Embedded C Developer with strong Linux/OpenWrt experience to develop firmware for residential WiFi gateways supporting DOCSIS/Fiber WAN and LTE/5G cellular backup.Key Responsibilities:Develop and debug embedded C software on Linux/OpenWrt platforms.Develop OpenSync managers, OVSDB integrations, and cloud-managed services.Implement LTE/5G failover, modem management, WAN routing, and health checks.Work with cellular modems using AT commands, QMI/MBIM, USB, and PCIe/MHI.Configure and troubleshoot WiFi drivers on Qualcomm/Broadcom/Atheros platforms.Debug Linux kernel, PCIe, USB, networking, and driver-level issues.Implement secure connectivity using TLS/mTLS, X.509, GRE, and IPsec.Develop OpenWrt UCI configurations, init scripts, storage management, and unit tests.Required Skills:5+ years of Embedded C development on Linux.Strong C programming, IPC, memory management, and event-driven programming.Hands-on OpenWrt experience including UCI, build system, packages, and filesystems.Experience with OpenSync, OVSDB, MQTT, protobuf or similar CPE frameworks.Strong Linux networking knowledge: IPv4/IPv6, routing, DHCP, netfilter, bridges.Cellular modem integration using AT/QMI/MBIM.Experience with GDB, strace, tcpdump, kernel logs, and serial console.Git/GitLab, CI/CD, cross-compilation, and Shell scripting.Preferred:Qualcomm IPQ / Broadcom BCM / Atheros chipsets.DOCSIS, WiFi 6/6E/7, PCIe/USB, eSIM/eUICC, TR-069/TR-369.5G NSA/SA, carrier aggregation, and ISP/MSO/OEM experience.Tech Stack: C, Linux, OpenWrt, OpenSync, OVSDB, MQTT, Qualcomm/Broadcom, WiFi, LTE/5G, IPv4/IPv6, TLS, GRE/IPsec, GitLab, GDB.","company":"Cygnus Professionals","rawCompany":"cygnus professionals","city":"Englewood","state":"CO","isRemote":false,"isActive":false,"createdAt":"2026-08-22T10:55:18.748Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1241.00","title":"Computer Network Architects","slug":"computer-network-architects"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"517112","title":"Wireless Telecommunications Carriers (except Satellite)","slug":"wireless-telecommunications-carriers-except-satellite"},{"code":"517111","title":"Wired Telecommunications Carriers","slug":"wired-telecommunications-carriers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Embedded C Developer – OpenSync/OpenWrt","description":"Embedded C Developer – OpenSync/OpenWrtWe are seeking an Embedded C Developer with strong Linux/OpenWrt experience to develop firmware for residential WiFi gateways supporting DOCSIS/Fiber WAN and LTE/5G cellular backup.Key Responsibilities:Develop and debug embedded C software on Linux/OpenWrt platforms.Develop OpenSync managers, OVSDB integrations, and cloud-managed services.Implement LTE/5G failover, modem management, WAN routing, and health checks.Work with cellular modems using AT commands, QMI/MBIM, USB, and PCIe/MHI.Configure and troubleshoot WiFi drivers on Qualcomm/Broadcom/Atheros platforms.Debug Linux kernel, PCIe, USB, networking, and driver-level issues.Implement secure connectivity using TLS/mTLS, X.509, GRE, and IPsec.Develop OpenWrt UCI configurations, init scripts, storage management, and unit tests.Required Skills:5+ years of Embedded C development on Linux.Strong C programming, IPC, memory management, and event-driven programming.Hands-on OpenWrt experience including UCI, build system, packages, and filesystems.Experience with OpenSync, OVSDB, MQTT, protobuf or similar CPE frameworks.Strong Linux networking knowledge: IPv4/IPv6, routing, DHCP, netfilter, bridges.Cellular modem integration using AT/QMI/MBIM.Experience with GDB, strace, tcpdump, kernel logs, and serial console.Git/GitLab, CI/CD, cross-compilation, and Shell scripting.Preferred:Qualcomm IPQ / Broadcom BCM / Atheros chipsets.DOCSIS, WiFi 6/6E/7, PCIe/USB, eSIM/eUICC, TR-069/TR-369.5G NSA/SA, carrier aggregation, and ISP/MSO/OEM experience.Tech Stack: C, Linux, OpenWrt, OpenSync, OVSDB, MQTT, Qualcomm/Broadcom, WiFi, LTE/5G, IPv4/IPv6, TLS, GRE/IPsec, GitLab, GDB.","datePosted":"2026-08-22T10:55:18.748Z","dateModified":"2026-08-22T10:55:18.748Z","hiringOrganization":{"@type":"Organization","name":"Cygnus Professionals","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Englewood","addressRegion":"CO","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"02508ce4657bddf8f139346f"},"url":"https://jobsearcher.com/jobs/02508ce4657bddf8f139346f"}}