A Quality Assurance (QA) Tester is someone who works with software to ensure that it works properly before it becomes available to the public by testing parts of the project at different stages of development.
QA is involved in the entire software development process to ensure the quality of the final product. This includes processes such as requirements gathering and documentation, source code control, code review, change and configuration management.
Magento QA Tester is a technical quality assurance role. The main responsibility is to ensure that technical project assets are of the highest possible quality, allowing Project Managers to deliver on time, and to specification with confidence.