MiddleSenior Manual QA Engineer with Mandarin Chinese

We are looking for a Middle / Senior Manual QA Engineer - IoT / Mandarin Chinese to validate an IoT ecosystem across physical devices embedded firmware communication protocols backend services and web/mobile applications. The role combines end-to-end quality ownership with onsite work at the client campus and communication with the China-based firmware team.

• Perform hands-on functional and integration testing of physical IoT devices;
• Validate end-to-end workflows from device and firmware through protocols backend APIs and web/mobile UI;
• Install configure maintain and troubleshoot devices and test environments at the client campus;
• Test MQTT ProtoBuf Modbus RS485 network connectivity firmware upgrades and recovery scenarios;
• Investigate defects across hardware firmware network backend protocol and UI layers;
• Clarify technical information between Mandarin- and English-speaking engineering teams.

Requirements:

• Fluent or native Mandarin Chinese and professional working English;
• Strong Manual QA experience with complex software and hardware systems;
• Hands-on experience testing IoT embedded smart-home or building-automation solutions;
• Experience with MQTT and MQTT debugging tools such as MQTTX;
• Understanding of Protocol Buffers Modbus RS485 REST APIs and backend integration testing;
• Practical TCP/IP Ethernet Wi-Fi DHCP DNS/mDNS and connectivity-troubleshooting knowledge;
• Experience testing physical hardware and embedded firmware;
• Ability to reproduce complex issues collect logs and produce clear defect and test documentation.

Nice to Have:

• Experience with commercial building automation systems;
• Experience testing lighting controllers sensors gateways or similar embedded devices;
• Experience with OTA or firmware-upgrade testing;
• Experience with Linux Wireshark serial diagnostic tools or IoT test automation.

Working Conditions:

• Work model: Onsite;
• Overlap: PST business hours;
• Target start date: October;

Benefits:

• Vacation and sick leave;
• Official state holidays;
• Professional growth through challenging projects and company-supported skills development;
• Flexible working schedule: 8 hours per day 40 hours per week;
• Personal Career Development Plan;
• Employee support program: Discount Care Heals and Legal support;
• Paid external training conferences and professional certifications aligned with business goals;
• Internal workshops and seminars.

Locations:

• Kirkland WA or Bellevue WA United States.