IConfiguration vs IOptions NET
Synchronous and Asynchronous in .NET Core
Model Binding and Validation in ASP.NET Core
ControllerBase vs Controller in ASP.NET Core
ConfigureServices and Configure methods
IHostedService interface in .NET Core
ASP.NET Core request processing
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Building a Taxi Booking Application |
To build a reliable taxi-booking application like Uber or Ola, GPS alone is not enough. GPS provides raw geographic coordinates (latitude and longitude), which are highly inaccurate indoors, suffer from signal "drift," and lack human-readable context.
To turn raw coordinates into a functional booking experience, you need a complete Location Stack consisting of the following technical components:
GPS gives you 17.3616, 78.4747. Your user needs to see "Charminar, Hyderabad".
What it does: Converts raw lat/long coordinates into a readable address, street name, or building name for the pickup field.
Top Options: Google Places API (Reverse Geocoding), Mapbox Geocoding API, Radar, or OpenStreetMap (Nominatim) for an open-source alternative.
Users rarely wait for GPS to lock onto their exact location; they usually start typing their pickup point or destination.
What it does: Provides type-ahead predictions, matches partial text to real-world locations, and corrects spelling errors.
Top Options: Google Places Autocomplete, Mapbox Search, or TomTom Search API.
Relying solely on GPS hardware drains the phone's battery rapidly and fails entirely inside high-rise buildings, tunnels, or metros.
What it does: Combines hardware inputs—Cell Tower IDs, Wi-Fi Networks, Bluetooth Beacons, and Accelerometers—with GPS to determine location instantly, even indoors or under heavy tree cover.
How to use it:
Raw GPS coordinates bounce around. If a user is standing on the sidewalk, the GPS might inaccurately place them inside a building or on an adjacent highway.
What it does:
Top Options: Google Maps Roads API, OSRM (Open Source Routing Machine), Valhalla, or Mapbox Directions.
To show a list of nearby drivers to a customer, your backend cannot query millions of driver coordinates globally every second. It will crash.
What it does: Divides the earth into a grid (cells). When a customer opens the app, the backend only searches for active drivers inside the customer's specific grid cell and adjacent cells.
How to use it: Implement Redis Geo commands (GEOSEARCH), PostgreSQL with PostGIS extensions, or libraries using H3 (Uber’s hexagonal hierarchical spatial index) or Geohash.
A taxi app requires instant updates. As drivers move, their positions must update smoothly on the customer's screen without refreshing the page.
What it does: Maintains a constant, lightweight, open connection between drivers, servers, and customers to stream live coordinate updates every 1 to 3 seconds.
Top Options: WebSockets, Socket.io, gRPC, MQTT (highly optimized for mobile networks), or managed services like Pusher and AWS AppSync.
| Feature Needed | Tech/API Tool | Purpose |
|---|---|---|
| Address Generation | Google/Mapbox Geocoding | Converts GPS dots to real street addresses. |
| Search/Type-ahead | Places Autocomplete | Allows manual address search with text prediction. |
| Indoor/Fast Lock | Fused Location (iOS/Android) | Combines Wi-Fi + Cell towers with GPS for battery efficiency. |
| Finding Nearby Cars | Redis Geo / Uber H3 | Indexes driver locations so matching takes milliseconds. |
| Live Map Movement | WebSockets / MQTT | Streams moving vehicle icons across the user's screen. |
For a taxi booking app, GPS alone is not enough. A production-grade taxi app typically needs the following location and mapping components:
Purpose: Get the customer's current position.
Required:
Data obtained:
{
"latitude": 17.3850,
"longitude": 78.4867,
"accuracy": 15
}
Purpose: Convert coordinates into a human-readable address.
Example:
17.3850, 78.4867 ↓ Banjara Hills, Hyderabad, Telangana
Providers:
Purpose: Let users search pickup and destination locations.
Example:
Providers:
Purpose: Show pickup point and route.
Features:
Options:
Purpose: Find route between pickup and destination.
Returns:
Example:
{
"distance": "12.5 km",
"duration": "28 min"
}
APIs:
Purpose: Find nearest drivers and ETA.
Example:
Driver A → 2 mins Driver B → 5 mins Driver C → 7 mins
APIs:
Purpose: Continuously update driver position.
Common technologies:
Driver sends location every:
2-5 seconds
Purpose: Detect when a driver enters or leaves an area.
Uses:
You need to handle:
Not just GPS coordinates.
Factors:
Used for:
Driver arriving in 3 mins Trip duration 25 mins
After getting locations:
Customer Location ↓ Nearby Drivers ↓ Calculate distance ↓ Choose nearest available driver ↓ Send ride request
Backend may use:
For a .NET/C# taxi application, a popular stack is:
.NET MAUI / Flutter
ASP.NET Core Web API
SignalR
PostgreSQL + PostGIS
Google Maps Platform
or
Mapbox
Firebase Cloud Messaging
If you're building the first version, implement:
These seven features will cover about 90% of the location functionality needed for an Uber/Ola-style taxi booking app
Features:
Technology:
Features:
Technology:
Most ride companies focus mainly on Android for drivers.
Responsible for:
Technology:
Stores:
Tables:
Responsible for:
Ride States:
Most important service.
Stores:
Functions:
Responsible:
External:
Responsible:
Providers:
Use:
For:
For geo-spatial searches.
UserId Name Phone Email Role
DriverId VehicleId Status CurrentLocation
VehicleId Type Number Model
BookingId CustomerId DriverId PickupLocation DropLocation Status CreatedDate
PaymentId BookingId Amount Status
Use Redis heavily.
Purpose:
Example:
driver:1001 lat:17.4512 lng:78.3812 online:true
Instead of:
foreach(driver)
{
CalculateDistance();
} Use PostGIS:
ST_DWithin()
Example:
SELECT * FROM Drivers WHERE ST_DWithin(location,customer_location,5000);
Returns drivers within 5 km.
Driver Phone | | Every 3 sec | v SignalR Hub | v Location Service | v Redis | v Customer App
Driver sends:
{
"lat": 17.412,
"lng": 78.456,
"speed": 43
}
For production:
Alternative AWS:
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