As a Junior QA Engineer at Sixer, you will be responsible for ensuring product quality across mobile platforms. You will perform functional, regression, and exploratory testing on web and mobile apps, along with API testing using Postman. You will also be responsible for logging and documenting defects, tracking and retesting bugs, and communicating effectively with developers. Additional responsibilities include validating new features, creating and maintaining test cases, collaborating with developers and product teams, and troubleshooting issues. The role requires a proactive individual eager to learn automation and performance testing in a fast-paced environment.