According to the job listing, it is calling for a designer with experience “developing weapons, abilities, and gameplay systems in action or first-person shooter games”. It also requires that the person applying for the job have a “passion for competitive first-person shooter games”, which if you’re wondering why it sounds familiar, it is because of a job listing from last year.
Last December it was discovered that Blizzard was hiring for a new first-person game that involved vehicles. Given that this job listing is also for a first-person game, it wouldn’t really be a stretch to think that Blizzard could be still hiring for the same game. Unfortunately knowing Blizzard, it could be a long time before we know anything more concrete.
It is possible that this could be for an existing IP, but save for Overwatch, there aren’t any games in Blizzard’s lineup that would benefit from being an FPS. Either way we’ll definitely be keeping our eyes peeled for more info.