Are you experienced in the Unreal Engine?
That doesn’t really matter here. The post says you must have experience with the unreal engine, you don’t have it. Besides, I’d be lead game designer anyway. So there’s not really a point in having two of us. Please re-read the post.
Side note, the caveat to “a designers job doesn’t need to use the game engine” is inherently false. When you’re at the indie or AA level, you most certainly do. Even if you’re in a AAA corporation, while you are hands off, you typically need coding, programming, artistic, or something technical in experience regardless.