Insomniac Games has largely focused on single-player titles over the last few years, producing big hits Ratchet & Clank: Rift Apart and Marvel's Spider-Man for the PlayStation. But it seems the studio has plans to work on a multiplayer project - although exactly what this could be is anyone's guess.
A job advert posted by Insomniac on Twitter mentions the developer has "five new job openings for a multiplayer project". Insomniac is looking for a creative director, systems designer, story lead, art director and VFX artist.
That doesn't give much away, but the systems designer job description does mention having a "thorough understanding of melee combat systems, enemy design and boss design" would be useful experience. The designer would help develop "combat, navigation, progression, and economy" for a multiplayer environment. Make of that what you will.