The future of the Halo franchise may not be as straight-forward as you'd imagine, if a Microsoft job advertisement is anything to go by.

The listing - for a software development engineer - suggests that Microsoft are working on a Halo project that transcends the idea of a single platform or genre, and suggests they are instead working on an all-encompassing Halo world, using Xbox, web and mobile to build a new Halo community.

We're looking to blend console, web, and mobile to create an immersive Halo world that follows the dedicated Halo fan wherever they go. We need engineers that can build connected technology while working in a startup environment.

As an engineer on this team, your responsibility will be to deliver a great out-of-game interactive experience that takes the next step beyond the systems found in Halo 3. You will work with artists, designers, developers and testers to finalize design plans, implement those plans, and help coordinate large-scale testing of the out of game Live experience by gamers across the world. Your work also will involve several external teams-including other MGS studios and the Xbox Live team-coordinating development dependencies and design considerations of experience as a whole.

There's no mention of a specific title that the successful candidate will be working on, but the position will be part of Microsoft's "Halo team", which is based in the company's Redmond HQ.