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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. A pixel Claude taking a whip crack — this one too
The commits are real

Toggl 2.0Toggl 2.0

I didn’t prototype the screens. I prototyped the product.

My role

Senior Product Designer on Toggl Track and Toggl 2.0

Email

Resume

GitHub

818 contributions in the last year

References

8 recommendations

Toggl 2.0Toggl 2.0

The timesheet kept getting more complicated. The interface didn't have to.

Toggl Track

Sometimes the right move is to change the question.

OROOM

From browsing to booking

Duolingo

1,616-day streak

Jana, smiling, in a black turtleneck against a pink wall

I treat designs like my own home — tidy, aesthetic, and above all functional.

Been

67 countries · 34% of the world

Flighty passport

Mobile app

Toggl 2.0 on iOS and Android

Browser extension

Toggl 2.0 extension for Chrome and Firefox

Q&A

What hiring managers ask me first

Building this site

Rather than designing the portfolio once, I built a system that let me design it.

Prague22:40

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