Senior Product Designer

Jana Gonsenicova

I hand over working software, not a spec. From research to merged pull requests, I design and ship time-tracking software at Toggl.

I design for complexity users shouldn’t have to see. The underneath still need to account for what can happen, and what happens next.

I map the rules before I draw the screen: what can happen, what happens next, and where those states collide. The interface comes after the logic.

I explore in , then converge and strip.

I don’t explore in isolation. I bring developers in right during exploration and pull in PMs and customer-facing teams when their context can change the answer. When something is easier to understand in code, I build it there.

I don’t hand off screens. I hand over a with the behaviour specified across states.

Not a Figma approximation — it runs in the production codebase and the team’s own design system, with the loading, empty, error and edge states in place. I use AI tooling, MCPs and skills to work directly in the codebase; everything I open goes through the same review as anyone else’s. Some of it merges directly; the rest engineers build from and cite in their own pull requests.

I trust over taste, including my own.

The method follows the question: production usage, surveys, interviews, usability testing, churn data. When the evidence disagrees with my solution, the solution changes.

This site is my own build.
The commits are real