Case 01 · Mobile app · Fintech

A credit simulator for small businesses

Six of every ten people abandoned the application. Not because of the rate — because they had no certainty about the credit they were taking.

ClientFintech LATAM
RoleProduct Design
ScopeApp, design system, research
DesignerAdry Salazar XP

The starting point

Where the request died — and what changed

MetricBeforeAfter Drop-off in the simulation flow60%−72% Time to accept the credit7+ days1 day Completed applicationsBaseline2.5× Reported scoreNot measured4.1/5

Baseline: bank landing page in Adobe Analytics, previous year vs. current, highest-volume months. After: Hotjar + moderated sessions, 15+ participants, first 80 days.

The cost

What the applicant could not see

No certainty

Is this figure mine?

The landing showed an approximation. People could not tell whether the number described their situation or an example.

No lever

What do I change?

Even when the maths was right, nothing told them which variable to move so the loan would fit their business.

No ceiling

Can I carry it?

Without payment capacity on screen, over-indebtedness was a decision the product let people make blind.

The friction was trust, not interface

Users did not believe the figures they saw until they verified them on their own. That hypothesis is what sent me to research before production — I had to know whether the real problem was calculation, clarity, or trust in the number.

Initial hypothesis

Research design

The same five steps, walked twice

Method

A comparative journey with 15 people actively looking for credit: once on the bank's live landing page, once on a simulator prototype carrying a dummy amortisation rate.

15 interviews · 5 Whys

Why a dummy rate

The point was never accuracy. It was whether a number tied to their situation reads differently from a range — and it does.

The finding

The drop happens at trust, not at maths

Landing pageSimulator prototype
15
15
Reaches the pageStep 01
6
14
Understands the offerStep 02
3
12
Trusts the figureStep 03
2
13
Knows what to adjustStep 04
4
11
Would complete itStep 05

In their words

An approximation is not an answer

"On the page it's an approximate that doesn't feel real to me. I don't know if that's my payment or an example."

Interviewee 04 · landing page

"Here I can see what I'd be paying and how much room I have. That's what tells me whether I can take it."

Interviewee 09 · simulator prototype

The call I made

The request was "build us a simulator". I decided not to take that as the problem statement.

People were not missing a calculator — they could not tell which variable to move. So I reframed the brief from showing the maths to showing the consequence of each adjustment, and that set the architecture of every screen after it.

Architecture

One screen, one decision

01

Simulate

Move one variable and see what it does to the payment.

02

Compare

Two scenarios side by side, summarised before the detail.

03

Request

Data capture only once the decision is already made.

04

Confirm

The final terms restated, with nothing new introduced.

The call I made

Interviews showed drop-off clustered wherever a screen asked for a decision and a data entry at once. Anything that could not be reduced to a single question got split — even when that meant adding a step.

The solution

Three decisions that carry the flow

Decision 01

One interaction per screen

Each number answers which banking factor to adjust, so the amount lands realistic instead of optimistic.

Decision 02

Loan data pinned on top

Terms stay visible while you simulate, so changing conditions never means losing your place.

Decision 03

Words the user already uses

Interactions and labels written in their language, which is what makes the next step feel safe.

The trade-off

What we deferred, and why

What users asked for

The simulator at the very start

Show me what I'd pay before you offer me anything.

Why it waited

Without real data there is no figure

Bureau data, monthly sales and business details are the minimum needed for a number that means anything. Showing one earlier would have meant showing a guess — the exact problem we were solving.

Alignment

The hard disagreements were about data, not design

Cloud

Availability

What the flow does when the service is slow or silent.

Database

Consistency

Adjusted amounts that contradict the factory offer are worse than none.

Offer Service

Risk-driven rates

Amortisation adjusts from the risk and bureau evaluation.

The call I made

I did not push the simulator through as a front-end feature. No state would ship without a defined behaviour for missing or late data — so loading, timeout, out-of-range and capacity-exceeded became designed states, and the release stopped depending on the service always being up.

Results

Certainty is what moved the numbers

−72%

Drop-off in simulation

Against the previous version, 80 days after release.

2.5×

Completed applications

Time to accept the credit fell from 7+ days to 1.

4.1/5

Reported score

On the experience of the process and the analysis time.

Hotjar behaviour data plus interviews and moderated sessions, 15+ participants. Internal product figures, not an audited study — the share attributable to design is what the qualitative sessions support.

What I take away

Three things this project taught me