Sebastião Sommer

Founding Product Designer

Founding product designer at a stealth AI company, building consumer wellness apps from zero to one. I work close to product, shaping experiments across onboarding, activation, and retention with a focus on both user value and long term outcomes.

In my free time, I build UI Sound Lab, Shader Playground, and .
Stealth AI Startup
Founding DesignerStealth AI Startup
2025 – Current
HOP Design
Sr. Product DesignerHOP Design
2023 – 25'
Tempest
Sr. Product DesignerTempest
2022 – 23'
44 Studio
UX/UI Designer44 Studio
2020 – 22'

Seb doesn't just make things look good, he understands product, makes smart tradeoffs, and moves fast without sacrificing quality. His work helped us get our first paying customers, raise at YC's Demo Day, and set the foundation for everything since.

Ben Katz

Co-Founder @ HYBRID (YC F24)

X/TwitterLinkedInGitHubEmail
Play