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2025·Full-stack development (Freelance)
Internal system · In production
Alquileres J&M
Full-stack equipment-rental management platform for a construction company, running in production for internal use.
Next.jsFastifyPostgreSQLOn-premise

The problem
A construction company managed its equipment rentals with pen, paper and Excel sheets. That made client pre-billing slow and real inventory control difficult.
What I built
I designed and developed an end-to-end rental management platform, deployed to production on the company's on-premise server (private access within their network).
- Tracking of 200+ assets with real-time inventory.
- Client billing and automated pre-billing.
- Admin dashboard for daily operations.
Outcome
It fully replaced the manual process, sped up pre-billing and improved inventory control. Stack: Next.js, Fastify, PostgreSQL.
Screenshots

