Lead Game Tester The senior tester for quality assurance must be the resident expert on each product the studio develops; they should fully understand every system, tool, and feature of the games. It is the senior QA tester’s responsibility to design and implement a strategy for putting the game to every test and supervising a staff of QA testers in the effective execution of the plan. For every component of the product, this person must define a methodology for testing and a process of isolating and identifying bugs.