AI-Driven Game Designer: Prototyping & Playtesting

Principle; Greater London; Hybrid; GBP 104,000 - 128,000; Full time

Job summary

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.

Qualifications

• A game design track record, with shipped titles or substantial work taken from concept to playtest
• Hands-on prototyping skills in Unity, Unreal, Godot or a scripting environment, so you build your ideas yourself
• An obsession with game feel, controls and player agency
• Curiosity about generative AI and a love of experimenting
• Confidence running workshops and working with researchers and engineers
• The right to work in the UK

Responsibilities

• Building a quick playable prototype around a new AI capability
• Playtesting it, breaking it and tuning how the AI behaves
• Leading a brainstorm on new ways AI could change gameplay
• Turning research ideas into clear mechanics and player loops
• Showing your work and shaping creative direction with the team

Skills

Game design

Prototype skills

Unity

Unreal

Godot

Scripting env

Playtesting

Workshop facilitation

AI curiosity

Tools

Unity

Unreal Engine

Godot

Job description

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.