Selected UX Work · 2023–2025

Research-led design for products people love to use.

I'm Katarina — a Senior UX Researcher & Consultant with 20+ years across research, information architecture, and interaction design. I diagnose why a flow breaks, redesign the structure around what people are trying to do, and validate it with real users before anyone writes production code. Five engagements below — from moderated usability studies to shipped apps.

UX Research Usability Testing Information Architecture A/B Testing Interaction Design Accessibility
20+
Years in UX
5
Case studies
2
Products shipped to stores
11/11
On core tasks, moderated test
Featured Case Study
01Usability Testing · IA Redesign

From "Who are you?" to "What do you want to do?"

SAVVAS Learning Company · via Digital Silk

A K-12 support portal made educators identify themselves before it offered any help — a structure that mirrored the org chart, not the user's goal. People bounced off the site and phoned support instead.

I diagnosed the identity-first flow as the root problem, rebuilt the information architecture around user tasks, and made the interactive prototype. The client's in-house research team then ran a moderated study with real educators; we designed the research together and analyzed it jointly.

11
educators, moderated sessions
11/11
success on core tasks
6.5+
mean ease (SEQ 1–7)
7
issues caught pre-build
My roleIA redesign · interactive prototype · test-task design · joint analysis. The redesigned portal shipped to production.
support.savvas.com ↗
Moderated studyUsability test findings: all 11 participants found the delivery-tracking path
Detailed findings — the task-oriented layout let all 11 participants find the delivery-tracking path quickly.
The Rest of the Collection
App architectureInformation architecture connecting the customer app to internal tooling
Magellan Jets private client app, live on the App Store
IA connecting the customer-facing app to internal tooling · the shipped Private Client app.
02Mobile App · Architecture & UX

A private-aviation app, from RFP to App Store

Magellan Jets · via Digital Silk

Magellan Jets wanted to give private-jet clients control over the whole journey — booking, real-time flight status, Jet Card hours, passenger preferences, and in-flight requests — in one member app.

Working from a complex RFP, I built the app architecture connecting the client-facing app to internal tooling, plus the sitemap, navigation, and UX copy. I partnered with the UI designer on screens, coordinated client and FE/BE developers, and tested iOS and Android releases.

My roleApp architecture · IA & navigation · UX copy · release testing on iOS & Android. Live on the App Store and Google Play.
App Store ↗
03A/B Testing · Conversion

Testing the form before building the funnel

AAMCO Franchises · via Digital Silk

AAMCO wanted a franchise-recruitment site built to convert. Rather than guess at the highest-stakes moment — the lead form — I put two designs head to head.

I ran an A/B test of two contact-form variants on UXtweak before build, so the production form was shaped by evidence, not opinion.

My roleTest design · variant UX · analysis feeding the production build.
franchises.aamco.com ↗ Agency case study ↗
A/B variantsTwo contact-form variants tested on UXtweak
AAMCO franchise production website
The two contact-form variants tested · the production site informed by the results.
04IA · Content Strategy · UX Copy

Structure for a complex multinational site

BELFOR · via Digital Silk

BELFOR, a disaster-recovery leader, wanted to feel more approachable to residential clients and to bring order to sprawling, unstructured multinational content.

I led the engagement end to end — coordinating content, design, and branding — and produced the sitemap, navigation, UX copy, and landing-page modules for the WordPress build, on top of a keyword-driven content strategy (80 hours of dedicated strategic work).

My roleProject lead · IA & UX copy · content & SEO strategy.
belfor.com ↗
Information architectureBELFOR information architecture and content mapping
BELFOR production homepage: Restoring More Than Property
IA and content mapping → the live homepage, "Restoring More Than Property."
Before
BT Surgery website before redesign
After
BT Surgery website after redesign
Before → after · rebrand, restructure, and a performance lift from grade D to B on GTmetrix.
05Branding · Web · Strategy

A clinic rebrand that also loads faster

BT Aesthetic Surgery Center · independent engagement

A Belgrade aesthetic-surgery clinic needed a rebrand, a new site, and a marketing strategy. I led a small team as Creative Strategist and Producer.

We shipped a new identity, procedure filtering and Before–After case studies to help patients decide, and a performance pass that moved the site from grade D to grade B on GTmetrix.

My roleCreative strategy · content structure · production lead.
btsurgery.com ↗
Katarina Kaplarski Vuković
About

Katarina Kaplarski Vuković

Senior UX Researcher & Consultant · Founder, Fragments United

I'm a UX researcher and consultant with 20+ years of experience helping teams create digital products users genuinely enjoy. I teach Human–Computer Interaction at Metropolitan University Belgrade, and I run the Museum of UX — a growing collection of interface decisions worth learning from.

Across the work above, one throughline: I don't guess. I find out why a flow breaks, restructure it around how people actually think, and prove it works before it ships. Because behind every screen there's a person — and they should feel happy using what we build.

Let's work together

I help teams build products
people love to use.

Research that answers real questions, structure that matches how people think, and design validated before it ships.

Let's improve your product fragmentsunited.com