← All work

Case study · Product Design · Het Nieuwe Klantdossier

Earning the redesign.

I take over the new client file the day before its beta goes live, with most of it already built. An opinion does not move a half-built product. User data does.

ProductClient file, B2B tax SaaS at Nextens (RELX)
RoleDesign lead, Beta 1 to release
ResearchAbout 12 studies, 8 to 600 users each
PlaybookShip → Prove → Redesign
PeriodEnd 2023 to 2025
01 · The problem

One long list, and a ten-second wait.

The client file is where tax advisors start every task. The old one opens every tax type and every year at once, on technology that cannot grow.

Half the screen unused
10+ s
to load a person file
Every year
open at once, so users scroll past what they do not need
Half
of the screen stays empty
02 · Ship to learn

Ship the beta I do not believe in.

Beta 1 swaps the list for tabs and cards that scroll sideways. The product manager wants to hold it back. Viewport data says ship, so it goes live on time.

Trade-off: users work in a version I know is not final.

Usage dataPreference testBeta survey
End 2023Beta 1 goes live
9 to 12 months laterThe redesign
03 · Let users decide

81 users settle the argument.

With our UX researcher I run a preference test in March 2024: the beta cards against a list grouped by year. 70% choose the list. Extension and authorisations show at a glance, and the data is denser.

Trade-off: the always-visible data of the cards goes.

A · Cards
Chosen
B · List by year
70%
List by yearCards
04 · Patterns first

Borrow the layout people already know.

File managers, webshop accounts, chat apps and SaaS tools share one layout. It becomes the anatomy of the new client file.

File manager
Webshop account
Chat app
SaaS tool
Toolbar
Navigation
Content
Overview
05 · Iterate

13 navigations, 15 client cards.

The versions settle the menu, the year accordions and the client relations: fiscal partner, allowance partner and owned companies, each one a link.

13navigation versions
15client card versions
06 · Fewer clicks

A shortcut for the most frequent task.

Creating a tax return now starts from the plus next to a tax type.

Pre-selectedThe tax type you clicked is already chosen.
All periods onEvery open period is ticked by default.
No duplicatesPeriods that already have a return are locked.
07 · Keep measuring

After launch, one way to open a page.

Feedback asks for fewer clicks. An audit finds pages that open in three different ways, so every page gets one header: back link, client name, main action.

Full screenOpens over everything
ModalOpens on top, context hidden
Own sub-menuOpens with its own navigation
One header everywhere
08 · Impact

The old client file is switched off.

In 2025 every user works in the new one.

70%
Of 81 users choose the list layout
8.2/10
Usability score, ready to become the default
100%
Of users on the new client file
5.35x
Faster person files, for 95% of users
2.75x
Faster company files
25+
Improvements, from KvK data to zip downloads

Opening a person file

5.35x faster
New client file
1x
Old client file
5.35x

Opening a company file

2.75x faster
New client file
1x
Old client file
2.75x
Bar length is relative load time, average January to September 2025. The speed comes from the rebuild as a whole, design and engineering together.
09 · What travels

Two lessons I take to any product.

Ship to learn.

A beta in real hands ends more debates than any review meeting.

Experts want density.

People who work in a screen all day want to see everything at once. Familiar placement is a feature.

Next: the task list, the Werkzaamhedenlijst. It has been through two designers before me. The same playbook is now at work there.