Master new skills with our 21-day learning paths, broken into easy 5-minute daily lessons.

Start your journey for free.

mobile Intermediate 21 lessons

Realm Database

Master local-first mobile data. Implement Realm for high-performance offline storage and sync data seamlessly with MongoDB Atlas.

Users expect apps to work offline. Realm is a fast, object-oriented database built specifically for mobile devices. This course teaches you to define object models, perform complex queries, and handle migrations locally on the device. You will then learn to sync this data to the cloud using MongoDB Atlas Device Sync, handling conflict resolution and permissions. This local-first architecture ensures your app remains responsive regardless of network conditions.

✅ 100% Free & Lifetime Access
⏱️ 5-Minute Lessons (Bite-sized learning)
🚀 21-Lesson Path (Independent modules)
📱 Mobile Friendly (Learn anywhere)
Mobile Data
Start Learning
Secure Enrollment via SSL

Complete Course Syllabus

  • 1
    Realm Basics
    Installing the SDK and defining object schemas.
  • 2
    CRUD Operations
    Writing and querying data efficiently on the main thread.
  • 3
    Relationships
    Linking objects and managing cascading deletes.
  • 4
    Migrations
    Updating database schemas without losing user data.
  • 5
    Device Sync
    Connecting local Realm to cloud MongoDB Atlas.

Estimated completion time: 21 lessons • Self-paced learning • Lifetime access

Career Outlook

Estimated Salary
$100k - $140k

Career Paths

Mobile Data Engineer $110k-$150k
iOS/Android Lead $120k-$165k
Solutions Architect $130k-$170k

What You Will Learn

Design efficient local object models for mobile applications
Perform high-performance queries and transactions on device
Implement real-time data syncing with MongoDB Atlas
Handle schema migrations and data versioning safely
Manage conflict resolution strategies for offline data writes

Skills You Will Gain

Realm Database MongoDB Atlas Offline-First Design Data Sync Mobile Architecture

Who Is This For

Mobile Developers
Data Architects
Offline-First Devs

Prerequisites

Mobile Development
Database Basics

Realm Database FAQs

CoreData vs Realm?

Realm is faster and easier to use than CoreData/SQLite.

Cross-platform?

Yes, supports iOS, Android, React Native, and Flutter.

Is it free?

Local DB is free; Sync requires Atlas subscription.

SQL knowledge?

Not needed; Realm uses an object-oriented model.

Need more info?
All Reork courses are 100% free, self-paced, and fully accessible on mobile devices. No prior experience is required. Read our full Platform FAQ.

Tech Stack & Tools

Realm Studio
MongoDB Atlas
Android Studio
Xcode
Postman

Recommended Next Steps

Android with Kotlin

mobile Beginner

Build native Android apps. Master Kotlin programming, Jetpack Compose for UI, and Room database for local storage.

Mobile CI/CD (Bitrise)

mobile Advanced

Automate the app store. Build cloud pipelines with Bitrise to auto-sign, test, and deploy iOS and Android apps without a dedicated Mac.

Mobile UI Patterns

mobile Intermediate

Design intuitive mobile experiences. Master touch navigation patterns, gesture interactions, and platform-specific guidelines (HIG vs Material).

Start Learning