My name is Jinsu Kim. I'm a product designer based in Berlin, currently living in Geneva with my wife.
At Rey, I help people build and publish mobile apps — as intuitively as snapping Lego bricks together.
Before Rey, I spent five years at B2B SaaS startups in Seoul, designing zero-to-one products in fast-paced teams.
I'm now shaping the next chapter of my career around a core question:
"What kind of software craftsmanship delivers the greatest business impact — if skill weren't a limit?"
That question drives how I learn from users, define problems, and ship solutions — without hand-offs.
What worked, what didn’t, and what I’ll do differently next time.
Reflecting on where I’ve been — and where I’m going next as a designer who ships.
Shortened time-to-value through onboarding design, resulting in a 6x increase in paid plan conversions.
Removed posting barriers to streamline the flow and increase new posts by 35%.
Identified critical blockers in the revenue withdrawal process and led a cross-functional redesign under strict constraints.