Good input, good points by yqertz. If he's working in a software shop, he's one cog in a large wheel.? He only has access to and control over one limb of the app elephant.? These days VR games are so freakingly complex and code dense, no single person can grasp and manage it all.
Also, the code warriors I know seem to look at the GUI as just eye candy, there to validate that the code they are writing works? For them, the fun and games, the dopamine spike, the immersive experience is in writing the code.? That's what they stare at for hours on end the code, not the GUI.
And general audiences are? more sophisticated these days. The prime target audience for this film, computer geeks, are super sophisticated, jaded and skeptical about all films where software development is core to the way the plot plays out.? Gone are the days when a movie can palm off a moment when a young kid looks at a GUI -- a GUI! -- and exclaims. "I know this.? It's Unix." (Jurassic Park, 1993).? Punchline:? if you look closely at the hardware in that scene, "Unix" is running on Apple hardware!
However, as yqwertz suggested,? the MC is a tester might work.