Principal UX Designer Job at The Trade Desk in Los Angeles

The Trade Desk is changing the way global brands and their agencies advertise to audiences around the world. With a media buying platform that helps brands deliver a more insightful and relevant ad experience for consumers - and sets a new standard for global reach, accuracy, and transparency.

We are proud of the culture we have built. We value the unique experiences and perspectives that each person brings to The Trade Desk, and we are committed to fostering inclusive spaces where everyone can bring their authentic selves to work every day.

So, if you are talented, driven, creative, and eager to join a dynamic, globally-connected team, then we want to talk!

About The Role

At The Trade Desk, we believe great design is both powerful and intuitive - seamlessly blending clarity, intelligence, and elegance to help our users make faster, more confident decisions. We're looking for a Principal Product Designer who brings a rare mix of strategic insight, exceptional craft, and a deep understanding of human behavior and business context.

In this role, you'll lead design for core areas of Kokai, our next-generation platform, and shape experiences that feel simple - even when the underlying systems are not. You'll help create a product that's not just usable, but intuitive and empowering, by turning complexity into clarity and aligning cross-functional teams on a shared vision of excellence.

You'll operate at the highest level of individual contribution while partnering closely with Product, Engineering, and Research leadership. Beyond your direct ownership areas, you'll elevate design quality across the platform - identifying opportunities to unify patterns, refine interaction models, and guide teams toward useful, purposeful experiences that meet the needs of both users and the business.

What You'll Do

• Champion design excellence, deeply informed by user behavior, psychology, and business outcomes, across the organization by identifying shared UX opportunities, aligning on standards, and raising the bar for craft, coherence, and usability across the platform.
• Collaborate with other UX leads to design simple, intuitive, and elegant experiences for deeply complex workflows - setting a new standard for usability in enterprise-grade tools.
• Translate data-heavy systems and workflows into experiences that feel light, structured, and focused - helping expert users prioritize, act confidently, and stay in flow.
• Apply a strong product sense and understanding of business levers to ensure design decisions are not only user-centered but strategically aligned.
• Drive quality and consistency across key product areas, while also owning and executing design strategy for critical pillars of the Kokai platform.
• Partner closely with Product and Engineering to shape roadmaps, define requirements, and advocate for user-centered, insight-driven decision-making.
• Coach and influence other designers through critiques, systems thinking, and storytelling - modeling best-in-class design practices and raising the bar across the team.
• Contribute to Harbor, our unified design system, to push quality and consistency across all surfaces and components.
• Lead by example through design critiques, mentorship, and collaboration-helping foster a culture of continuous improvement, excellence, and shared ownership of quality.

Qualifications

The Trade Desk is an equal opportunity employer. All aspects of employment will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other status protected under federal, state, or local law.

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