It is possible for a QA engineer to obtain an O-1 visa, but it would depend on the individual’s qualifications and experience. The O-1 visa is for individuals with extraordinary ability in their field, and a QA engineer would need to demonstrate that they possess a level of expertise and accomplishment that sets them apart from their peers. This could include awards, publications, and other recognition in their field. Additionally, the individual would need to have a job offer from a US employer and the employer would need to file a petition on their behalf.