Wasali • Delivery App

Overview

Wasali is a native Android delivery platform composed of two Kotlin apps: one for customers and another for delivery partners. The system streamlines the process of ordering and delivering shopping items. Customers submit a shopping list, which is automatically assigned to the nearest delivery partner. The partner purchases and delivers the items, and receives payment in cash.

I was the main Android developer on the Wasali project, but also worked closely with another developer on the delivery partner app. I also collaborated with the backend team to implement new features and integrate RESTful APIs using Retrofit. The apps follow the MVVM architecture and utilize modern Android tools such as Dagger-Hilt for dependency injection, Kotlin Coroutines for asynchronous programming, and the Google Maps API for geolocation. One of the core features I worked on is a background location tracking service in the delivery partner app, enabling real-time tracking of delivery agents to ensure efficient order assignment.

This project was a valuable experience in which I learned a wide range of advanced Android skills, including implementing real-time location tracking in the background, scheduling and executing background tasks using Alarm Manager, and waking the app from a paused or locked state to notify delivery partners of new orders.

Technologies Used

◆ Platform: Android

◆ Programming Language: Kotlin

◆ Architecture: MVVM

◆ Backend: REST API

◆ Authentication: Custom OTP system (Icosnet API)

◆ Android Stack: Google Maps API, Places API, Retrofit, Room, Proto DataStore, Coroutines, Dagger Hilt, Jetpack Navigation, Paging 3, Coil

◆ Notifications: Firebase Cloud Messaging

◆ Completion Date: May 2024

Key Features

◆ User authentication with phone-based OTP and Trusted Devices system to reduce authentication costs
◆ Dynamic shopping list UI for customers to easily create and edit their orders
◆ Background location tracking service for delivery partners, active even when the app is minimized
◆ Wake-lock notifications that alert partners about new orders even when the screen is off
◆ Order reminder system using Alarm Manager to notify partners about unhandled orders
◆ Real-time notifications for status updates, new orders, and reminders

◆ Partner wallet screen showing current earnings, payable amount, and transaction history
◆ Token refresh system to maintain secure sessions with Retrofit Authenticator
◆ In-app language switching allowing users to change the app language instantly