👋 Hey there! I’m Sean Kesterson, a Senior Product Designer based in Brooklyn, NY, partnering with early-stage startups to build intuitive UX and scalable Design Systems.

With over a decade of experience, I’ve collaborated with teams at Apple, MasterClass, and Yield Guild Games, delivering impactful digital products across web and mobile.

Some Recent Case Studies

What I bring to the table

Design Expertise

  • Design Systems

  • UI Design

  • Visual Hierarchy

  • Responsive Layout

  • Wireframing

  • Full stack working with the engineer and design team

  • Web3 - NFTs, smart contracts, full ecosystem

Prototyping Skills

  • Beginner Vibe Coding

  • User flows

  • User Testing

  • Usability validation

  • Prototypes

Tools and Platforms

  • Figma

  • FigJam

  • Webflow

  • Lovable

  • Replit

What People Are Saying

“I had the pleasure of working with Sean at Curai. He is THE go-to designer for visual design systems, raising the bar for pixel-perfect and scalable UI development. He has a unique mix of hyper attention to detail while being easy to work with at the same time. He's very knowlegeable about the latest trends and tools. Besides design systems, he's always ready to jump onto other design projects. His positivity and emotional maturity make him a great addition to any team. I certainly hope to work with him in the future.”

— Yvonne Hung - Curai Health

“I had the pleasure of working with Sean for the better part of 2020 at MasterClass. Sean's role within design evolved over his tenure there with a cool fluidity that is uniquely Sean™. Design systems, growth, enterprise — wherever there was a need Sean rolled up his flannel sleeves and delivered vital work. He was never daunted by any new task, and eager to apply his strong creative foundation to any new problems. Sean was also a deeply kind, caring, and supportive member of the team. Eager to help others, optimistic, and always bringing a fun and humor to any situation.”

— Ben Domanico - Masterclass

“ve worked closely with Sean both partnering as IC's and as his manager. Both experiences were wonderful and fruitful. Sean has extreme attention to detail, sharp visual design taste and skill, and relentless empathy for the end user. Some accomplishments that stand out: Sean spearheaded our first Design System for the web product pretty much from scratch that still shines today in most of its original form. Sean also led the design for our SEO/articles platform, creating a product that both provided high value for readers while fulfilling our company's growth goals. Sean also led design for the our first enterprise products and experiences that required constant cross-functional collaboration and innovation. Sean performs all this with clear communication, strong feedback/collaboration skills, professionalism, positivity and energy. I look eagerly look forward to working with Sean many times again in the future.”

— Jordan Ma - Masterclass