InmobiThe multilingual real estate platform built for borderless property investment — serving US buyers
By Kenneth Melchor, Founder & Technology Director

Overview
This case study details how KAUFAST built the InmobiMobi platform — a solution that could serve property buyers, sellers, and investors enabling borderless property investment across 5 European and Latin American markets, each with its own legal frameworks, tax structures, and language expectations. We built a full-stack multilingual real estate platform supporting 12 locales, country-specific property intelligence, and native mobile apps from a single shared codebase.
The engagement covered the full product lifecycle — from multi-locale architecture and AI-powered data pipelines to native iOS and Android apps sharing a single codebase. Every component was designed to feel native in each market, adapting tax calculations, mortgage tools, and listing formats to local expectations.
The Challenge
Cross-border real estate is fragmented. A buyer in Germany looking at property in Spain faces language barriers, unfamiliar tax systems (ITP, AJD, Grunderwerbsteuer), and incompatible listing formats. Existing platforms either serve one country well or many countries poorly. InmobiMobi needed to feel native in every market — showing Stamp Duty calculators in the UK, Kaufnebenkosten breakdowns in Germany, Fideicomiso guidance in Mexico, and EPC energy certificates in Spain — all while maintaining a single deployable application. The technical challenge: zero hardcoded text across 25 translation namespaces, country-aware financial calculators, and hybrid mobile apps for iOS and Android.

The Solution




A single codebase serves property seekers in 5 countries across 12 languages — from council tax bands in London to Fideicomiso zones in Cancun — with zero hardcoded text and sub-1.5s page loads.
Results
12
Languages supported simultaneously
5
Country markets with localized intelligence
95%
Code shared between web and mobile apps
<1.5s
Largest Contentful Paint (LCP)
Performance
Mobile · Google PageSpeed Insights
KAUFAST Track Record
97+
Lighthouse score on kaufast.com across all four categories — verified via Google PageSpeed Insights, June 2026
20+
Years delivering technology solutions — founded in Barcelona, 2004
50+
Projects delivered across 6 countries and 3 continents
< 100ms
Time to First Byte via Vercel Edge Network — every managed project, worldwide
All metrics independently verifiable. Last audited June 2026.

Credits
Technologies
- React
- TypeScript
- Node.js / Express
- PostgreSQL (Supabase)
- Vite
- Capacitor (iOS & Android)
- Cloudflare R2
- i18next
- Leaflet / Google Maps
- Railway
- Vercel
- Playwright
Team
- Product & Strategy Lead
- Full-Stack Engineer
- i18n & Localization Architect
- Mobile Platform Engineer
- SEO & Performance Engineer
- QA & E2E Testing
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