Xingchun Z.

Senior QA Engineer | AI Automation | Business Logic Specialist

Senior QA Engineer with 10 years of experience in SaaS, including 6 years specialized in complex marketing systems and end-to-end data integrity, helping teams launch bulletproof software. I don't just find bugs, I eliminate technical bottlenecks and business risks. By combining AI-assisted code analysis with a deep understanding of product logic, I provide "ready-to-fix" root cause reports that save your developers hours of debugging. I specialize in identifying hidden edge cases and optimizing the testing process to ensure your product is stable, secure, and user-ready. Services I Offer I can test all aspects of your software: - Web & Mobile: High-precision testing for Web, iOS, Android, and Mini-programs. - Business Logic: Deep verification of complex workflows. - API: REST API testing. - Complex Data & Integration: End-to-end verification for marketing automation systems, cross-system data synchronization, and multi-database joint testing to ensure data integrity across the entire workflow. - Automation: Building sustainable Pytest / modern web automation frameworks to speed up your release cycle. - Performance: Identifying bottlenecks with JMeter before they impact your users. Skills & Tools - Project & Test Management: Jira, Confluence, XRay, Testlink - API & Automation: Postman, Swagger, Python(Pytest) - Database & Data: MySQL, Oracle, MongoDB, Elasticsearch, Redis, Data Integrity Testing - Data Tools: ETL testing, Data Synchronization, Cross-database verification - Performance & DevOps: JMeter, Jenkins, GitHub, BitBucket - Methodology: Agile, Scrum, SDLC optimization Testing Devices Desktop: Mac OS, Windows Mobile: Latest iOS & Android physical devices Simulators: Comprehensive coverage for various screen sizes and OS versions. Why Choose Me? Expert Root Cause Analysis: I don't just say "it's broken." I use AI and code-level investigation to find exactly where and why it’s broken, saving your team massive amounts of time. Product Logic Mindset: I think like a user and a product owner. I often find "hidden" risks in business logic that haven't been documented yet. Expert in High-Stakes Data Workflows: With 6 years in marketing systems and 3 years focused on complex data synchronization, I specialize in validating multi-system integrations and joint database queries. I ensure that your data remains accurate as it moves through various nodes and technologies. Process Improvement: I help you optimize the collaboration between QA and Dev, preventing the same issues from happening twice. Top Rated Plus Reliability: A proven track record of handling high-stakes projects with clear, professional communication. Flexible for Agile sprint cycles, daily test updates and clear bug lifecycle follow-up. Let's Connect! I enjoy diving into complex systems to make them robust and reliable. Whether you need a deep dive into your business logic or a specialist to hunt down persistent bugs, I'm ready to add immediate value. Let’s talk about making your software the best it can be! Open for one-time audit, ongoing part-time support and long-term retainer contracts.