Denis — Lead Product Designer

Denis Kharchenko — Lead Product DesignerI make complex products feel obvious. 13 years of experience, based in Warsaw, working with teams worldwide.Case studies

Fixing a product that lost its way — a B2B mortgage simulator brokers had abandoned for Excel, split into a fast in-meeting Advisory flow and a Fulfillment flow for lender submission.

Making complex products simple — an electric-car marketplace redesigned around first-time buyers who didn't yet speak EV.

Making client research adaptive — Questy, an AI discovery tool built 0-1 as a founder: research that asks follow-up questions and ends in a client brief.

Notes

Can design change the decision?

When the ticket costs more than the fix

A Figma file shouldn't need a guided tour

Design needs a harness too

The full text of every case study and note, readable without JavaScript: /llms.txt (summary) and /llms-full.txt (complete).© Denis Kharchenko. All rights reserved. Summaries and short quotes with a link back are welcome.