iOS Developer is a role in the Mobile Development family. It has 53 skills across 5 levels (from Junior to Principal). 108 skills are mandatory. Key domains: Programming Fundamentals, Backend Development, Frontend Development.
Technology Stack
Focus by Level
Building UI screens from designs (UIKit/SwiftUI). Working with URLSession/Alamofire. Layout with Auto Layout. Writing unit tests. Fixing bugs.
Designing module architecture (MVVM/TCA). Working with CoreData/SwiftData. Setting up push notifications. In-App Purchases. Code review.
Application architecture. Performance optimization (Instruments). Modularization (SPM). Offline-first design. Mentoring.
iOS platform: CI/CD, modularization, design system. SwiftUI vs UIKit strategy. Coordination with backend and QA. Release management.
Company mobile strategy. Choosing native vs cross-platform. Architecture for scale. WWDC insights and adoption strategy.
Skill Matrix
53 skills × 5 levels. Click on a cell for details.
AI-Assisted Development
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| GitHub Copilot | A | W | A | E | E |
| Cursor IDE | A | W | A | A | — |
| ChatGPT / Claude | A | W | A | E | E |
| Prompt Engineering for Code | A | W | A | E | — |
API & Integration
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| REST API Design | A | W | A | E | E |
| GraphQL Design | A | W | A | E | E |
| WebSocket API Design | A | W | A | E | E |
| API Documentation | A | W | A | E | E |
Architecture & System Design
2 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| System Design Fundamentals | A | W | A | E | E |
| Clean Architecture | A | W | A | E | E |
Backend Development
2 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Apache Kafka | A | W | A | E | E |
| Redis | A | W | A | E | E |
Cloud & Infrastructure
5 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Docker | A | W | A | E | E |
| Kubernetes Core | A | W | A | E | E |
| Terraform | A | W | A | E | E |
| AWS | A | W | A | E | E |
| Network Fundamentals | A | W | A | E | E |
Database Management
3 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| PostgreSQL | A | W | A | E | E |
| Database Indexing | A | W | A | E | E |
| Query Optimization | A | W | A | E | E |
DevOps & CI/CD
1 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| GitHub Actions / GitLab CI | A | W | A | E | E |
Frontend Development
1 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Data Fetching | A | W | A | E | E |
Mobile Development
8 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Swift & SwiftUI | A | W | A | E | E |
| UIKit & Auto Layout | A | W | A | E | E |
| Core Data & SwiftData | A | W | A | E | E |
| Combine & Swift Concurrency | A | W | A | E | E |
| Mobile CI/CD | A | W | A | E | E |
| Mobile Security | A | W | A | E | E |
| Mobile Performance | A | W | A | E | E |
| App Store Optimization (ASO) | A | W | A | E | E |
Observability & Monitoring
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Structured Logging | A | W | A | E | E |
| Prometheus & Grafana | A | W | A | E | E |
| OpenTelemetry | A | W | A | E | E |
| SLI / SLO / SLA | A | W | A | E | E |
Performance Engineering
1 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Performance Budgets | A | W | A | E | E |
Programming Fundamentals
9 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Algorithms & Complexity | A | W | A | E | E |
| Data Structures | A | W | A | E | E |
| OOP & SOLID Principles | A | W | A | E | E |
| Design Patterns | A | W | A | E | E |
| Multithreading | A | W | A | E | E |
| Async Programming | A | W | A | E | E |
| Code Quality & Refactoring | A | W | A | E | E |
| Type Safety & Type Systems | A | W | A | E | E |
| Memory Management | A | W | A | E | E |
Security
3 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| OWASP & Application Security | A | W | A | — | — |
| Secure Coding Practices | A | W | A | E | E |
| JWT / OAuth2 / OIDC | A | W | A | E | E |
Testing & QA
4 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Unit Testing | A | W | A | E | E |
| Integration Testing | A | W | A | E | E |
| E2E Testing | A | W | A | E | E |
| Mobile Testing | A | W | A | E | E |
Version Control & Collaboration
2 skills| Skills | Jun | Mid | Sen | Lead | Princ |
|---|---|---|---|---|---|
| Git Advanced | A | W | A | E | E |
| Code Review | A | W | A | E | E |
FAQ
What skills are needed for the iOS Developer role?
The iOS Developer role requires 53 skills, of which 108 are mandatory. Skills are distributed across 5 levels: from Junior to Principal. See full matrix.
How to advance to the next level in the iOS Developer role?
Use the Grade Calculator to assess your current level and get personalized recommendations. The system will show which skills need to be developed for the next level.
What tech stack is used in the iOS Developer role?
The stack includes 5 technologies at different levels. Swift 5.9+, SwiftUI/UIKit, URLSession, Auto Layout, Xcode, CocoaPods/SPM, XCTest, Swift 5.9+, SwiftUI + UIKit, Combine/async-await, CoreData/SwiftData, SPM, Fastlane, XCTest + Quick/Nimble, Firebase, Swift 5.9+, TCA/MVVM-C, SwiftUI advanced, Instruments profiling, Modular architecture (SPM), Metal basics, Core Animation...
How does the community define requirements for the iOS Developer role?
Role requirements are shaped by the community through a proposal system. Any member can suggest changes that go through voting and expert review.