Halo Infinite has added yet another co-developer in a move that is not uncommon for AAA games and the Halo series specifically. Developer Certain Affinity announced on its website that it is working with 343 Industries on Halo Infinite. In fact, Certain Affinity has been working with 343 on the project since December 2019.

On a wider basis, Certain Affinity has been collaborating on the Halo franchise across numerous titles at 343 and Bungie since 2006, so they are a veteran partner.

Certain Affinity's president is Max Hoberman, and he himself is the former multiplayer and online lead for Halo at Bungie.