9 Mobile Backends

9 Mobile Application Backend APIs

Production-Grade REST APIs for iOS & Android

Laravel REST APISanctumNode.jsMySQLPush NotificationsJWTWebSockets

Mobile Apps Powered

9apps

API Response Time

<45ms

Push Notifications

1M+sent

Active Endpoints

200+routes

Architected and deployed production-grade RESTful APIs for 9 mobile applications (iOS & Android) spanning hotel booking, attendance tracking, ride-hailing, logistics, e-commerce, and HR systems. Each API features Sanctum JWT authentication, FCM push notifications, WebSocket integration, and highly optimized database queries.

Architecture & System Design

Each mobile backend follows a modular Laravel API architecture with Sanctum token authentication, versioned API endpoints, and FCM integration for push notifications. The systems share common patterns but are independently deployable with app-specific business logic.

Request Flow

Mobile Client (iOS/Android)

API Gateway (Rate Limited)

Sanctum Token Auth

Versioned Route Handler

Service Layer

Eloquent + Optimized Queries

FCM Push / WebSocket Response

Shared authentication pattern across all 9 apps using Sanctum with device-specific token management
FCM push notification service with per-app topic subscriptions and targeted user notifications
Database query optimization reduced N+1 queries by 90% using eager loading and query scoping
API versioning strategy (v1/v2) for backward compatibility during mobile app updates

Engineering Challenges

Cross-Platform Token Management

Problem

Managing authentication tokens across 9 different mobile apps with varying session requirements and device types (iOS, Android, tablets).

Solution

Built a unified token management system using Sanctum with device fingerprinting, per-device token limits, and automatic token rotation for security.

Result

Single auth system serving 9 apps. Token-related support tickets dropped by 95%.

Push Notification at Scale

Problem

Sending targeted push notifications across 9 apps with different FCM configurations, user segments, and delivery priorities.

Solution

Created a centralized notification service with per-app FCM configuration, topic-based subscriptions, queued delivery with retry logic, and delivery confirmation tracking.

Result

1M+ notifications delivered with 99.2% delivery rate and < 2s average delivery time.

API Response Optimization

Problem

Mobile apps on 3G/4G networks needed minimal payload sizes and fast response times to maintain good user experience.

Solution

Implemented API Resource transformers for lean payloads, conditional field inclusion, pagination with cursor-based navigation, and Redis caching for frequently accessed data.

Result

Average API response time: 45ms. Payload sizes reduced by 60% with selective field loading.

Core Features

Hotel Booking System

Real-time room availability, date-range searching, payment processing, and booking confirmation with automated email/SMS.

Clean Code

FCM Notification Service — Queued Push Delivery

1<?php
2
3namespace App\Services;
4
5use App\Models\User;
6use Illuminate\Support\Facades\Http;
7
8class FCMNotificationService
9{
10    public function sendToUser(
11        User $user,
12        string $title,
13        string $body,
14        array $data = []
15    ): void {
16        $tokens = $user->deviceTokens()
17            ->where('is_active', true)
18            ->pluck('fcm_token');
19
20        $tokens->chunk(500)->each(
21            fn ($chunk) => SendPushNotification::dispatch(
22                $chunk->toArray(),
23                compact('title', 'body', 'data')
24            )
25        );
26    }
27}