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Job description
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.
Tasks
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
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.
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Worksite address
bellevue, WA, 98009, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.