Finaer & Fivy

I owned UX and market research, information architecture, app and web flows, the full design of finaer.es and the evolution of the design system. Three connected products:

• B2C mobile app · Fini → Fivy

  For tenants looking for a flat: they check their rental capacity, add participants and complete their file from their phone.

• B2B platform · SAI and Fivy Pro

  The agencies’ backoffice: properties, applications, applicant groups and risk assessment.

• Corporate website · finaer.es

  A complete redesign of the public pages to attract and convert agencies, landlords and tenants.

Tools and stack

• Figma
• Design systems
• UX Research
• Information architecture
• Mixpanel
• Firebase

Renting in Spain is slow: manual solvency checks, candidates lost along the way and group applications (couples, flatmates, guarantors) that are hard to assess.

The design challenge was to connect several players (main tenant, co-tenants, guarantors and agency) in one experience, simplify document collection and turn complex financial data into clear decisions for everyone.

The friction

• Slow processes

  Solvency was checked by hand and every file piled up back-and-forth documents between tenant and agency.

• Lost candidates

  While an application was being assessed, the tenant kept searching and the agency lost the candidate.

• Group applications

  Couples, shared flats and guarantors: several people, several documents and one single decision to make.

The app and the backoffice share the same file. I designed the whole journey so each player sees their part and both environments show the same result.

1. 01The agency creates the application

   • Adds the property in SAI
   • Opens an application (it can be saved as a draft)
   • Links candidates or groups

2. 02Participants complete their part

   • Applicant, co-tenants and guarantors
   • Personal details from the app
   • Step-by-step document upload

3. 03Risk assessment

   • Data and documents cross-checked
   • Solvency traffic light

4. 04Result in both environments

   • Risk traffic light
   • Maximum Guaranteed
   • Additional Deposit, if needed

Fini started as Finaer’s tenant app and, after a rebrand, evolved into Fivy: a companion for finding a flat in Spain that supports the user before, during and after choosing a home.

Key flows

• An onboarding that branches

  A first question about the housing situation adapts the journey: those who already chose a flat go straight to their application; those still searching can learn their rental capacity first.

• Several participants

  Collaborative flows to invite co-tenants and guarantors to the file and combine their solvency, without leaving the application.

• Documents and Maximum Guaranteed

  Step-by-step document upload with clear progress bars to reduce drop-off, and an easy-to-read Maximum Guaranteed result.

Tenant web platform

The same journey lives on Finaer’s tenant website: a five-step profile (property, personal details, co-tenants, guarantors and summary) that ends in a pre-guarantee certificate to share with landlords and agencies.

The result: a pre-guarantee to share

At the end, the tenant gets an estimated pre-guarantee, shares it via WhatsApp, link or QR, and sees what is left to confirm it. If the profile needs strengthening, the screen itself suggests adding a flatmate or a guarantor.

Fini: the mobile concept

Before the rebrand I explored the Fini mobile app: tenant–home matching explained step by step, searching by areas drawn on the map, and offers with their compatibility level.

Corporate website finaer.es

I designed the public pages of finaer.es end to end, built to attract and convert each audience: agencies, landlords and tenants, each with its own journey.

Agency backoffice (SAI)

The Smart Self-Management System is where the agency works on each file: it manages properties, draft applications and applicant groups (families or shared flats).

• A solvency traffic light (low, medium and high), so the agent understands a file’s viability at a glance.
• The Maximum Guaranteed and Additional Deposit shown next to the traffic light, to decide without doing the maths.

Evolving into Fivy Pro

Fivy Pro extends the backoffice with modules built for agencies’ day-to-day work:

• Lead management
• Property listings
• Extension feature
• Built-in chats
• Bookings

I instrumented the product with Mixpanel and Firebase to measure conversion and activation funnels and make data-driven decisions.

I fed the design system of both digital products, the app and the web platform, and unified them in one language, creating, refactoring and replacing in the master file the components that carry the longest flows.

• Multi-step progress bar

  Critical in the document onboarding: it says where you are and what’s left.

• Buttons

  Hierarchies, states and variants.

• Adaptive headers

  The same structure on mobile and web.

• Bottom sheets

  Actions in context: documents and participants without losing the screen.

• Faster files

  Creating and assessing a rental file became much simpler for agencies and tenants.

• One language

  Full consistency across the Fivy app, the SAI / Fivy Pro backoffice and the finaer.es website.

• Ready to scale

  An architecture built to grow and measured with Mixpanel and Firebase.

Takeaways

• In an ecosystem, design lives in the seams: what the agency sees and what the tenant sees must tell the same story.
• Translating financial risk into a traffic light and a number lets people make a complex decision in seconds.
• Progress bars and bottom sheets aren’t details: they are what keeps someone from quitting halfway through their documents.