Taipei, Taiwan

We are seeking a skilled Embedded Linux VoIP Phone Engineer to join our firmware team. The ideal candidate will have strong technical expertise in embedded Linux, VoIP protocols, and multi-threaded programming. You will be responsible for designing, developing, and maintaining firmware for our next-generation VoIP phones.


Basic Qualifications

• Hands-on experience with Linux kernel, bootloaders (U-Boot), and root filesystem.
• Strong skills in C, C++ for embedded systems. Familiarity with Bash/Python scripting is a plus.
• Deep understanding of SIP, RTP, SRTP, RTCP, STUN, TURN and ICE is essential.
• Familiarity with audio codecs (G.711, G.722, G.729, Opus, AAC) and echo cancellation (AEC), noise suppression, and jitter buffering.
• Strong knowledge of TCP/IP, UDP, DHCP, DNS, VPN, VLAN, and QoS for VoIP network environments.
• Experience with I2C, SPI, UART, GPIO, and Ethernet PHY drivers for hardware integration.
• Understanding of TLS/DTLS, SRTP, HTTPS, and network encryption for securing voice traffic.
• Strong understanding of multi-threaded programming, synchronization techniques, and inter-process communication (IPC).
• Experience with Buildroot, Yocto, or OpenWRT for Linux image creation and cross-compilation.
• Proficiency in using GDB, JTAG debuggers, Wireshark, SIP analyzers, and performance profiling tools.
• Familiarity with Git, Jenkins, Docker, and automated build/test pipelines for firmware.
• BS/MS in Computer Engineering, Computer Science or equivalent.
• Fluent in both written and spoken English to work effectively within a highly collaborative environment with colleagues around the world.

Preferred Qualifications

• Knowledge of secure coding practices for embedded systems.
• Familiarity with networking concepts, including TCP/IP, UDP, and VLANs.
• Experience with VoIP, SIP and WebRTC is a plus

Job Description

• In this role you will implement the firmware of UniFi product line, to make the best user experience product
• You will also implement features to support hardware testing and diagnosis of various kinds of embedded devices. 
• This is a highly cross functional role and you’ll work closely with various teams, like EE, Backend, Frontend, Mobile, QA, Factory and Manufacturing.