Yuki Iwanaga
Hi, I’m Yuki Iwanaga, and Creasty is my design and engineering studio.
I work with founders and leaders developing new products or rethinking complex systems. My work spans defining what to build, designing it, and building it.
I make the underlying meaning explicit as an idea moves between disciplines and people. You get clearer agreement about what you’re building, before different interpretations become conflicting decisions.
I clarify definitions, find the distinctions that change how a problem should be solved, and reconsider the question when its premise is too narrow. I handle ambiguity by deciding what needs precision now and what should remain open.
You get a clear basis for the next decision, with important distinctions resolved and emerging possibilities still open. Your team can make progress without treating every early assumption as a commitment.
I let intuition take an idea beyond what I can already explain, then use reasoning to test and develop it. I scrutinize the standard I judge it by as much as the idea itself. A genuinely good idea changes that standard. Whatever logic can establish, better logic can overturn, and above all, it’s boring.
You can bring an idea you can’t fully explain yet and develop it with someone who takes both its promise and its weaknesses seriously. The aim is a product that feels right and holds together.
Most of my work has been zero-to-one: first versions and substantial rebuilds.
Hospital software combining medical records and billing.
As the first employee, I helped take the product from concept to a working system, the first new attempt of its kind in Japan in two decades. The difficult parts often sit between medical records, billing, and the hospital’s day-to-day work.
Recruiting and professional networking services.
Engineering lead, then product management. I worked across several new products and substantial rebuilds.
I’ve also worked for a few other startups on the side.
In mid-2026 I went independent, to work across more domains.
My father is a software engineer, so computers were around from the start. In kindergarten, I used to say I wanted to be an inventor. I loved taking electronic devices apart to see what was inside, and wanted to make useful things of my own.
Typography caught me early, too. At twelve, at the height of Flash, I started programming for the web, drawn to what interactive expression could do. Looking back, digital products were where my interest in invention and my sense of design came together.
I enjoy the moments when something I didn’t know widens the view, or I come away with a way of seeing I didn’t have before. Outside work I look for the same, most often in something made to a standard high enough to raise my own.
show where the boundaries fall. Learning a new one is conceptual reconstruction: the same world, taken apart and put back together another way. has been with me since childhood, and in a good mood I can’t help it. I took lessons every other week for two years, and learned a lot: carrying a feeling in my voice also changes what I can hear in someone else’s. bring writing, design, and performance together until an imagined world feels real. Building a product is not far from it: a digital world, the real world it’s used in, and the bridge between them. are the craft within reach every day, and an obsession I have never tried to cure. The rooms make the introvert in me want to stay in; the clothes make me want to go out. teach me what to look for: the history of how hard it has been to see what is in front of you, the times each work came out of, and the beauty that outlived them. began as a way of unlearning: years of chasing beauty through the lens of designing things had quietly narrowed what I let myself see. The camera showed me how much I had not been seeing, most of it in ordinary moments nobody made at all.