Philip Sebastian

I moved to San Francisco in 2008, right before social media changed everything. The city felt smaller then. More weird. More experimental. I still think about that era a lot and how much technology, ambition, and culture have evolved since.

Currently I’m building Korpus ↗, exploring Moonrise ↗, and growing the builder community at Sidequest Ventures ↗. I'm also an investor + advisor to startups, including golden, Amplemarket, Paragon. I was one of the founding designers of SAP Build↗, the first enterprise prototype tool and fastest-growing product successes at SAP. Was also one of the earliest members of SAP Fiori↗ team, the official design language and UX standard for all modern SAP software today.   During my time in San Francisco, I built multiple personal apps that charted in the App Store, some backed by YC alumni, and was lucky enough to be featured in a few publications along the way.

I’ve also been part of a handful of founder communities and accelerator programs including OnDeck↗, Antler Ventures↗, Pioneer↗, YC Startup School↗, and Buildspace S4↗.

Now

Building Korpus — trust infrastructure for suspicious messages, screenshots, and links
Exploring Moonrise — wellness and longevity systems with a calmer AI posture
Operating Sidequest Ventures — a curated builder community for designer-led founders, repeat founders, and accelerator alumni

Experience

Product Designer at Apple
Senior UX Designer at SAP
Built and operated startups (Backed by YC Alumni) across fintech, SaaS, wellness, and consumer
Worked across developer tools, enterprise software, and AI-native products
Paragon / Apple / SAP / Imgur (selected work)

Principles

Clarity beats complexity
Trust is a product layer
Design should improve decisions
AI should reduce noise, not create more of it
Ship → learn → refine

Contact

Open to select 0→1 product, design, and advisory work.

About

Now

Experience

Principles

Contact