Embedded C Developer - OpenSync/OpenWrt WiFi Router

SFE

Hi,
Embedded C Developer OpenSync/OpenWrt WiFi Router with Cellular

Location: Denver, CO 4 days onsite per week

Interview: 2 Rounds Round 2 is Face-to-Face

Job Summary

We are seeking an experienced Embedded C Developer with strong expertise in Linux, OpenWrt, OpenSync, WiFi routers, Linux networking, and cellular modem integration .

Required Skills & Experience

5+ years of hands-on Embedded C development on Linux-based platforms.
Strong proficiency in C programming, including:
- Pointers and memory management
- IPC mechanisms
- Event-driven architectures
- Linux system programming
Hands-on experience with OpenWrt , including:
- OpenWrt build system
- Package management
- UCI configuration
- JFFS2/SquashFS overlay filesystems
Experience with OpenSync or similar cloud-managed CPE frameworks.
Knowledge of:
- OVSDB
- Protobuf
- MQTT telemetry
- OpenSync Managers
Strong experience with cellular modem integration , including:
- AT commands
- QMI/MBIM
- rmnet/wwan interfaces
- Network interface management
- LTE/5G connectivity and failover
Strong understanding of Linux networking , including:
- Routing tables and metrics
- Netfilter
- Bridge interfaces
- IPv4/IPv6 dual-stack
- Neighbor Discovery
- DHCPv4/DHCPv6
- SLAAC
- IPv6 Prefix Delegation
Understanding of TLS and secure provisioning , including:
- TLS handshake
- Mutual authentication
- X.509 certificates
- Certificate chain validation
Knowledge of networking security and tunneling technologies:
- GRE
- IPsec
- VPN overlays
- Secure encapsulation for cloud-managed traffic
Experience with event-loop frameworks such as libev, libuv, or similar .
Proficiency with embedded/Linux debugging tools:
- GDB
- strace
- tcpdump
- Kernel logs
- Serial console
Experience with Git, GitLab CI/CD, and cross-compilation toolchains .
Understanding of WiFi standards , including 802.11ax/802.11be and wireless driver configuration.

Top Skills

Embedded C Development on Linux/OpenWrt
- C programming
- Linux internals
- Debugging
- IPC
- Event-driven software design

OpenSync/OpenWrt Platform Development
- OpenSync Managers
- OVSDB
- UCI
- MQTT
- OpenWrt build system

Linux Networking & LTE/5G Cellular Integration
- Routing
- IPv4/IPv6
- Network failover
- QMI/MBIM
- Cellular modem management
- GRE/IPsec

Apply

Vacancy posted 2 days ago

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