Skill Profile

Core Data & SwiftData

Persistent storage, NSFetchedResultsController, migrations, CloudKit sync, SwiftData

Mobile Development iOS Development

Roles

3

where this skill appears

Levels

5

structured growth path

Mandatory requirements

9

the other 6 optional

Domain

Mobile Development

Group

iOS Development

Last updated

3/17/2026

How to Use

Choose your current level and compare expectations. The items below show what to cover to advance to the next level.

What is Expected at Each Level

The table shows how skill depth grows from Junior to Principal. Click a row to see details.

Role Required Description
Flutter Developer Uses Core Data and SwiftData at a basic level in Flutter 3. Creates simple screens from designs. Understands the application lifecycle.
iOS Developer Creates simple Core Data models and performs basic CRUD operations. Understands NSManagedObjectContext and persistent store coordination. Migrates lightweight schema changes.
React Native Developer Understands Core Data basics for hybrid storage in React Native iOS apps. Bridges native persistence layer with JavaScript via native modules. Works with SwiftData for simple local storage.
Role Required Description
Flutter Developer Independently implements complex screens with Core Data and SwiftData in Flutter 3. Optimizes performance and memory consumption.
iOS Developer Independently implements complex screens with Core Data and SwiftData. Optimizes performance and memory consumption. Works with asynchronous patterns.
React Native Developer Independently implements complex screens with Core Data and SwiftData. Optimizes performance and memory consumption.
Role Required Description
Flutter Developer Required Designs mobile app architecture with Core Data and SwiftData. Optimizes performance for low-end devices. Implements CI/CD for mobile development. Mentors the team.
iOS Developer Required Architects mobile application with Core Data and SwiftData. Optimizes performance for low-end devices. Implements CI/CD for mobile development. Mentors the team.
React Native Developer Required Architects mobile application architecture with Core Data and SwiftData. Optimizes performance for low-end devices. Implements CI/CD for mobile development. Mentors the team.
Role Required Description
Flutter Developer Required Defines mobile application architecture. Establishes development standards. Conducts architectural reviews and defines the technical roadmap.
iOS Developer Required Designs Core Data data model for iOS applications: entity schema, migrations, fetch request optimization. Configures NSFetchedResultsController for efficient data display, implements background contexts for heavy operations. Implements CloudKit synchronization via NSPersistentCloudKitContainer for multi-device support.
React Native Developer Required Defines the iOS data storage strategy for React Native projects — choosing between AsyncStorage, MMKV, SQLite, Realm. Reviews native module integration for Keychain and UserDefaults access. Establishes guidelines for data migration between app versions on iOS.
Role Required Description
Flutter Developer Required Defines mobile strategy at the organizational level. Evaluates cross-platform vs native approaches. Shapes platform solutions.
iOS Developer Required Develops data persistence strategy for large iOS applications: choosing between Core Data, SwiftData, and Realm with justification. Designs migration pipelines for data schema evolution, optimizes performance with millions of records. Implements conflict resolution strategies for cloud synchronization and data layer testing.
React Native Developer Required Shapes the organizational strategy for iOS platform data management. Defines native module architecture for optimal storage — when Core Data bridging is justified vs MMKV/SQLite. Coordinates compatibility between React Native and native iOS team solutions.

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