Job Title: Sr. Embedded Developer
Location: Englewood, CO - onsite
Top Skills Required:
- Embedded C Programming, Linux, Operating System (10+ years)
- WiFi standards and Networking Domain Expertise (10+ years), basic understanding of 5G/LTE technology (high level)
- Strong debugging and problem solving skills (10+ years)
Prior experience working with networking devices such as wifi routers, cable modems, CMTS etc. will be beneficial. Hands on experience working with Opensync, OpenWRT, RDK-B etc. will be an advantage.
WiFi Integration
- Develop and maintain WiFi radio configuration across Qualcomm, Broadcom, and Atheros chipsets for 2.4GHz, 5GHz, and 6GHz bands
- Implement and debug WiFi features including band steering, client steering, channel selection (DFS/non-DFS), BSS Coloring, OFDMA, MU-MIMO, TWT, and MLO (WiFi 7)
- Work with hostapd/wpa_supplicant configuration, CFG80211/mac80211/nl80211 driver interfaces
- Develop and maintain OpenSync WiFi managers for cloud-managed radio configuration, client monitoring, and statistics reporting
- Debug WiFi driver crashes, firmware asserts, performance regressions, and interoperability issues across client devices
- Implement mesh/extender backhaul configuration and optimization
- Develop and tune RvR (Rate vs Range) and throughput KPIs across firmware builds
- Support channel switching, ECSA, radar detection (DFS), and regulatory compliance across multiple country codes
Cellular Backup (Phone-as-Backhaul)
- Implement phone-as-backhaul connectivity - enabling the router to use the customer's mobile device as a backup WAN path
- Develop the router-side failover client that communicates with the companion mobile app (MSA) to initiate and terminate backup sessions
- Implement WAN outage detection and internet reachability healthcheck framework
- Develop route arbitration and traffic steering logic between primary WAN and phone-based cellular backup
- Manage concurrent WiFi AP + STA operation - serving home clients on AP while connected to phone hotspot as upstream STA
- Handle USB tethering detection and network interface management (RNDIS/CDC-NCM/CDC-ECM)
- Implement graceful failback logic when primary WAN recovers
- Develop LED state machine logic for multi-WAN connectivity status indication
- Implement QoS and bandwidth management during cellular backup mode (customer's data plan awareness)
Platform & Common
- 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 secure communication channels using TLS with mutual authentication (mTLS) between router and cloud/mobile app
- Debug kernel-level issues including network driver crashes, kernel panics, and memory leaks
- Develop init scripts, UCI configuration handlers, and persistent storage management for OpenWrt
- Analyze and resolve field issues using device logs, crash dumps, logpull analysis, and remote diagnostics
- Write unit tests and participate in code reviews via GitLab merge requests
- Collaborate with hardware teams, QA, cloud platform engineers, mobile app teams, and service provider partners
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