Principal Designer

The Trade Desk · New York

  • Senior
  • Full-time
  • $182,800 – $335,200
  • Posted 2026-10-26
  • Confirmed live on 29 October 2026

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Job description

The Trade Desk is a global technology company and the world’s leading independent platform for digital advertising, with over 3,000 employees across more than 30 offices. Our technology helps advertisers reach the right audiences across the open internet — from streaming TV and podcasts to mobile apps, news, and more.

Advertising powers the content people love. By making it more transparent, effective, and responsible, we help support trusted journalism, quality entertainment, and creators worldwide. The world’s brands and agencies rely on us to reach their customers and grow their businesses responsibly.

The scale of our platform brings unique technical challenges — from processing massive datasets in real time to building systems that operate reliably on a global scale. When you work here, your impact is worldwide. We welcome diverse perspectives, encourage curiosity, and build teams that learn from one another. If you’re driven to solve meaningful challenges, we’d love to meet you.

What We Do

The Trade Desk is seeking a Principal Design Lead to own and evolve our Digital Playbook and to modernize how our design practice works. Partnering closely with Product, Product Marketing, and Brand, you will set a best-in-class standard for how our platform looks, feels, and evolves.

This is a senior individual-contributor design leadership role for someone who can see around corners on where our product language and platform experience need to go, and who can take that vision from concept through shipped, polished product. You will guide the evolution of our design language and systems so they stay cohesive and scalable as the platform grows and AI reshapes what advertisers and agency partners expect.

You bring deep, hands-on fluency with AI tools and use them to change how design gets done: faster exploration, tighter design-to-build handoff, and higher craft. You will help evolve our workflows, standards, and practices as we modernize, and you will work in lockstep with the design lead driving AI experience vision so the Playbook and product language support AI-powered capabilities consistently across the platform.

You are adept at product and brand integration, storytelling, and visual design, and you can bridge these domains to accelerate our product language and evolution.

This role reports to the Senior Director of UX Design and is a core leader of the UX team’s impact.

What You Will Be Doing

As Principal Design Lead at The Trade Desk, you will:

Own & Evolve the Digital Playbook

• Define, maintain, and evolve the Digital Playbook, including design foundations, style guide, component anatomy, and the guidance that connects them, as the source of truth for how our product and brand show up across the platform

• Set the standards and principles that help teams design with consistency, clarity, and craft

• Keep the Playbook a living resource: adopted in daily work, responsive to product change, and measurable in its impact on quality and speed

• Translate ambiguous product and brand needs into clear, usable guidance that teams can apply with confidence

Partner on Core Platform Evolution

• Work in close partnership with the Director leading Core Platform Evolution to ensure the Playbook and the platform’s direction evolve together

• Guide the evolution of our product design language as the platform grows, helping unify the experience, reduce fragmentation, and close quality gaps

• Identify shared patterns and align teams on best practices, raising the bar for coherence and usability across the product suite

• Lead hands-on, high-fidelity design of foundational elements, from early concept through detailed specification and adoption

Define the Modern Design System

• Help define what a modern design system is at The Trade Desk: how it is structured, how it scales, and how it supports both designers and builders

• Partner with our Design Technologist to bridge design and code, ensuring foundations, anatomy, and patterns translate cleanly into the product

• Shape how the system evolves alongside the Playbook so guidance, components, and implementation stay in sync

Bridge Product, Brand & Storytelling

• Partner with Product Marketing and Brand to integrate brand expression into the product in a way that feels intentional, distinctive, and consistent

• Build a shared visual and narrative language that connects what we say about The Trade Desk with how the platform looks and feels

• Present vision and direction to senior leadership with compelling storytelling that aligns stakeholders and accelerates decisions

Partner on the AI Experience

• Collaborate with the design lead for AI experience to translate their vision into consistent patterns, standards, and guidance within the Playbook

• Ensure the product language, components, and visual conventions support AI-powered capabilities (assistive, predictive, generative, and agentic) in a cohesive, trustworthy way

• Contribute to cross-fu

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