CargaTurno

The problem

Knowing whether a charger is free sounds trivial and isn't: almost nobody publishes that information. Spain's official source does, but its public quota is 5 requests per hour and each returns a single charging point. With tens of thousands in the catalogue, any given point would refresh once every few months.

The solution

Combine five data sources and rigorously separate three things the industry routinely conflates: inventory (what exists), operational status (whether it works) and real availability (whether it is free right now). The app never presents «in service» as if it meant «free». For live data, a source offering 2,500 daily lookups covering a whole station was added, keeping the official one for what it does best.

What it includes

• Request budget tracked in the database and shared across every code path, so external API quotas can never be exceeded
• Vector cartography with a bespoke style and GPU-side point clustering
• Driver handovers, queues, incident reports and ratings
• Trip planner with stops computed from real vehicle range
• Deduplication of points appearing in several sources at once
• Installable on mobile and usable offline

Outcome

Live application with 1,789 points in the local copy and real-time availability working against real data. The separation between inventory, operational status and availability is enforced by the data model, not by convention.