Contact person: GPS based multiplayer game

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Location: Zurich, Switzerland

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I am looking for a developer to build a GPS-based multiplayer mobile game similar to [login to view URL], but played in the real world.
Players move in the real world and draw a trail on a map using GPS data. When they close a loop, the enclosed area is captured.

Main Features:

Two modes:

1. Without public transport – only walking/cycling counts as trail.


2. With public transport – vehicle movement also counts as trail.



Create and join lobbies (game sessions) with game settings.

Real-time area and trail updates for all players in a lobby.

Map display with polygons (captured areas) and polylines (active trail).

Loop-closing logic with size/density limits and opponent area subtraction.

Public transport lines from OpenStreetMap integrated for movement detection.


Technical Requirements:

Frontend: FlutterFlow (preferred, low-code) or Flutter

Backend: Supabase (PostgreSQL + PostGIS) with Edge Functions (Deno/TypeScript)

Maps: Google Maps or MapLibre integration in FlutterFlow

Realtime: Supabase Realtime Channels

OSM Import: Public transport lines imported into PostGIS (tram, train, subway, etc.)


Deliverables:

1. Fully functional FlutterFlow app with the described features.


2. Supabase database schema with tables, views, and security rules (RLS).


3. Edge Function for GPS position ingestion and loop-closing logic.


4. Map rendering of trails and territories with real-time updates.


5. Documentation for deployment and basic admin tasks.



Additional Information:

A full developer briefing with database schema, API specs, and code examples will be provided.

The game logic and server-side functions must be implemented in a secure, anti-cheat way." (client-provided description)