Buying a house in Portugal means a broker's spreadsheet, ten banks moving at different speeds, and a layer of taxes and fees that is rarely explained in English. I built a dashboard with Claude Code to bring it all into one place.
Design & development
Personal project
Claude Code
Every offer re-priced for the same house: cheapest per month against cheapest overall, with the best value on each row in green
Claude Code proposing a three-panel layout: sidebar views, a pinned summary strip and a Scenario panel for every input
Claude Code's proposal for the three-panel layout
The first step was structure. Emails, offers, appointment notes and broker messages became one consistent schema, and Portugal's lending rules, such as the Banco de Portugal debt-to-income stress test, became code, so every offer is assessed the same way.
A BANKS object in code: each bank's loan-to-value, term, rates, insurance and fees as one typed entry
Each bank's offer as one structured entry
Code implementing the Banco de Portugal debt-to-income stress test rule
The regulator's lending rule, written as code
The broker's comparison is re-priced against the house price and down payment I set. Each row is colour-coded, green for the best value and yellow-green for close behind, so the strongest offer stands out without reading every column. Using those offers and each bank's own lending rules, the calculator then shows what is realistically within reach as you adjust house price, down payment and annual income.
Adjust income, price or down payment to see what it takes, and what it costs
A full breakdown of the mortgage and every fee on top of it, alongside a timeline of when each payment falls due.
Cash needed for the deal, the monthly payment, and when each amount is due
A sanity check on the whole decision: over a given time horizon, does buying actually beat renting?
Adjust rent, time horizon and growth assumptions to see which option comes out ahead
An overview of where each application stands, and the next step with every bank.
Application status for ten banks with the next step for each
Ten banks in one table: the stage each application has reached and what comes next
Every step from choosing a house to getting the keys, with typical timings, so nothing in the process comes as a surprise.
Numbered roadmap from offer and reservation through valuation to final approval
The route from offer to keys, with typical timings for each step
Angelo Wellens, Product Designer
Builds from first idea to launched product
