About the Job

Principle is seeking a game designer to build playable prototypes that explore how AI can transform gameplay. You’ll work with researchers and engineers in a world-class AI team to translate ideas into mechanics and player loops, from concept to playtest.

The role emphasizes hands-on prototyping in Unity/Unreal/Godot, a love of game feel, and curiosity about generative AI. Hybrid London work weeks include Tue–Thu on-site, with strong creative freedom.

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