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Giona FossatiProduct DesignerYou opened this portfolio from your personal link, so its private case studies are unlocked for you.Password:
I turn complex tools and messy data into products people can actually use.
I’ve spent 5+ years across enterprise retail tools and early-stage startups.
About me
My Services
Design partner
I join as your designer and handle the design from the first sketches to launch, working directly with your developers.
Audit and design system
I find what's making the product hard to use and what to fix first. Then I build a design system that keeps it consistent as you grow.
Working prototype
I design the idea and build a working version with real data, so you can test it with users or investors before you commit to development.
Extra capacity
I join your team for a project or a busy period, using your tools and your process. White-label is fine.
Selected Work
Recent work. Full case studies, including the retail analytics project, available on request.
How research changed the product.
Four projects where I ran the research myself and it changed a product decision. In most of them there was no research team, so the method had to fit the time and the people I could reach.
Inditex · 2021–2026
I polled about 35 analysts on four versions of the same sales chart
LightupHub · 2026
I coded students’ open answers into themes and crossed them with how easy they found the app
Abako · 2026
I ran five think-aloud sessions across a whole project, from posting it to getting paid
SmarTerp · 2021
I observed, interviewed and tested interpreters to design how they hand over the microphone
Read article about how research changed the productRead article about how research changed the product
2021–2026
Inditex
X Redbility2021–2026
Placing the bets: how Zara’s product managers decide what goes in front of customers twice a week.
Analysts made daily decisions by piecing together data from four separate sources. I mapped their journeys, identified the flows that mattered most, and designed dashboards that adapt to their changing goals across the week.
I was the only designer on the project, working with business teams and 50+ developers across 5+ internal tools.
Time spent on weekly review
−25%
- Replaced 4 or more Excel files with 1 dashboard
Read the case study about Placing the bets: how Zara’s product managers decide what goes in front of customers twice a week.Read the case study about Placing the bets: how Zara’s product managers decide what goes in front of customers twice a week.
1FIT · 2023–2025
Fitness Startup
2023–2025
From UX audit to a redesigned app and a design system for iOS and web.
1FIT is a fitness startup with a B2B2C model, which lets fitness coaches give their clients an app to track their progress.
I started with a UX audit of the iOS app: its main action, logging daily data, was buried two or three levels deep, and the app had no clear primary goal.
As lead designer, I redesigned the client app around daily logging and coach feedback, built a custom design system for iOS, and tailored IBM’s Carbon to the coaches’ web app, migrating the existing screens onto it.
Core issues found in the UX Audit
9
Feature build time with design system
1–2 weeks
3 weeks previous average
Case study coming soon
Kunveno · 2021
Interpreting software
2021
SmarTerp: design of an interface for a highly cognitively demanding situation, simultaneous interpretation.
SmarTerp is a computer-assisted interpreting tool for Kunveno: it gives simultaneous interpreters automatic speech recognition while they work remotely.
I led the product design as an intern focused on accessibility: interviews with ten interpreters, a contextual inquiry in the booths, and the interface tested with a ProtoPie prototype.
Mean SUS score in usability tests
90.5
Mean ease rating per task
6.5 / 7
A workout tracker built around muscles, not routines
Most fitness apps assume you follow a fixed plan. I designed Workout Logger for people who train what they feel like: pick a muscle group, tap to log a set, done. It tracks weekly sets per muscle and suggests what to train today based on recovery.
I built it with Claude Code on Supabase and Vercel: a live product with accounts, real data, offline support, in English and Italian. It’s the same way I build working prototypes for clients.
Workout Logger · Web app · 2026
Let’s talk
How can I help you?
Pick the one closest to you and see how I’d help.
The service that fits you
Design partner
I join as your designer and handle the design from the first sketches to launch, working directly with your developers.
First step
A call about your product and what matters most right now.
The service that fits you
Audit and design system
I find what's making the product hard to use and what to fix first. Then I build a design system that keeps it consistent as you grow.
First step
An audit, a fixed-scope project, so you know exactly what you'll get.
The service that fits you
Working prototype
I design the idea and build a working version with real data, so you can test it with users or investors before you commit to development.
First step
Agreeing on what the prototype needs to prove.
The service that fits you
Extra capacity
I join your team for a project or a busy period, using your tools and your process. White-label is fine.
First step
A look at the brief and your timeline.
The service that fits you
Something else
Need something smaller or different? I also take on focused projects.
How I’d help
Design partner
I join as your designer and handle the design from the first sketches to launch, working directly with your developers. I can be your only designer, or work alongside your existing design team on the problems that matter most in your app.
I’ve done both: the only designer at startups, and one of several designers in larger teams.
First stepA call about your product and what matters most right now.
Audit and design system
I find what's making the product hard to use and what to fix first. Then I build a design system that keeps it consistent as you grow.
First stepAn audit, a fixed-scope project, so you know exactly what you'll get.
Working prototype
I design the idea and build a working version with real data, so you can test it with users or investors before you commit to development.
First stepAgreeing on what the prototype needs to prove.
Extra capacity
I join your team for a project or a busy period, using your tools and your process. White-label is fine.
First stepA look at the brief and your timeline.
Something else
Need something smaller or different? I also take on focused projects.
Book a call
Get in touch, book a call.
Open to full-time/contract roles
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