UI/UX Designer

Please note that this is a hybrid position based in Cardiff, requiring 3 days onsite each week, with the option for remote work on the remaining days.

Atomic Theory is a multinational team of seasoned AAA veterans with roots at studios like Blizzard, PUBG, Epic Games, and Unity.

We’re passionate.

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building player-first experiences with strong engineering foundations, performance excellence, and accessibility baked in from day one.With offices in Albany, NY; Austin, TX; Cardiff, UK; and Brighton, UK, we operate globally with one mindset: Get Sh!t Done.ABOUT THE ROLE:As an Mid-Level UI/UX Designer, you are a fully capable, independent contributor who handles complex UI tasks and systems within your domain.You take ownership of mid-scope UI features and solve complex design or technical challenges

You are expected to work autonomously, unblock peers when necessary, and ensure your work is high-quality, stable, and integrated into the project pipeline.

At this level, you are not leading the team, but you are a key contributor whose technical and design expertise keeps features moving forward efficiently.

WHAT YOU'LL DO:Design, implement, and optimise complex UI features and systems (menus, HUD modules, dynamic flows, procedural elements).

• Develop and maintain UI libraries, reusable components, and critical systems to support your feature domain.

Implement and optimise or have knowledge of custom UI shaders, materials, or advanced animations to achieve specific visual or functional goals.

Debug and solve technical UI issues (engine, blueprint, middleware) to unblock your feature work.

Validate UI functionality and appearance across resolutions, aspect ratios, and gameplay contexts.

Improve personal and small-team workflows to increase efficiency and reliability.

Contribute to UX flows, usability, and interface consistency within your domain.

• Maintain documentation for tools, systems, and components to ensure clarity and reproducibility.
• Collaborate with engineers, designers.