Mingjun Chang
I am Mingjun Chang, a QA professional with 20 years of experience in automated testing and exploratory approaches, including four years at Microsoft and ten years in financial services.
About
I am Mingjun Chang, a QA professional with 20 years of experience in automated testing and exploratory approaches, including four years at Microsoft and ten years in financial services. I have hands-on experience with C#, Python, SQL Server, Oracle, Java, and testing frameworks such as Selenium, NUnit, and Postman. I specialize in context-driven testing, bug triage, and delivering reliable, high-quality releases in fast-paced environments.
I’m a collaborative team player who thrives in Agile squads, contributing to analysis, design, and continuous improvement. I’m ISTQB certified and proactive about knowledge sharing and quality ownership across teams.
- Joined October 2025
Industry experience
- Financial Services
- Software & Internet
- Professional Services
More experts in Christchurch, New Zealand
Work experience· 6 roles
Performed end-to-end exploratory and automated testing of an asset finance product across accounting, pricing, and REST APIs. Contributed to Vertex tax integration testing and REST API validation, ensuring accuracy and regulatory compliance. Employed NUnit, proxy tests, Selenium, and API tests; validated backend data in SQL Server and Oracle; collaborated in Scrum/Kanban.
Tested 15+ agile projects using Java, Oracle, MySQL. Analyzed requirement documents and developed test plans with context-driven testing approaches. Identified technical, architectural and process risks and issues. Automated UI test cases by Python and Selenium and Automated API test cases. Developed a Python-based test case generation tool from Excel inputs. Improved testing environment management and reduced post-release bugs by 50%. Developed over 200 automatic deployment pipelines via CI/CD tools.
Developed test plans and led team members to complete test tasks according to plan. Controlled quality of test cases to improve efficiency and performed performance appraisals to support team progress.
Education
Certifications and awards
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