Job responsibilities: 1. Participate in the company's product requirement analysis, design testing plans, and write test cases; 2. Conduct functional testing, integration testing, system testing, performance testing, and automation testing; 3. Analyze the test results, accurately describe and track the discovered bugs; 4. Continuously improve the testing process, increase testing effectiveness, and improve testing efficiency; 5. Maintain active and effective communication with product managers, R&D teams, demand side teams, and other relevant teams to drive problem resolution.