iOS Engineer

Guilherme
de Mello.

I build and modernise iOS apps: concurrency-safe Swift, clean architecture, and AI features that ship to real users.

Who's writing this

6+ years writing iOS end to end. Currently at EIDA Solutions in Ireland, I own the full platform and lead the implementation of ambitious features, like Slopes, the migration of login to Auth0, and the modernisation of the platform from RxSwift / UIKit to Combine / SwiftUI.

I care about the things that actually break apps in production, data races, retain cycles, and the memory issues that hide until you're at scale.

On the side I ship AI-powered apps on the App Store. I write, I speak at conferences like iOSDevUK, and I've authored a book on native iOS development.

The toolkit.

Swift & Concurrency: Swift 6strict concurrencyasync/awaitactorsSendablestructured concurrencyCombineGCDARC & memory management
UI: SwiftUIUIKitaccessibility (VoiceOver, Dynamic Type)Apple Human Interface Guidelines
Architecture: MVVMMVVM-CoordinatorClean ArchitectureSOLIDDependency InjectionProtocol-Oriented ProgrammingSPM modularisationCocoaPods
AI & LLM: Anthropic Claude APIClaude CodeCodexApple Foundation ModelsAgent configurationsCustom Skills
Data & Offline-first: GRDBSQLiteCore DataSwiftDataCloudKitbackground syncconflict resolutioncaching
Networking: URLSessionAlamofireRESTCodablepaginationretry/backoff
Security & Auth: KeychainAuth0 (OIDC/OAuth 2.0)SSL/certificate pinningbiometricsdata protection
Quality & Delivery: XCTestXCUITestTDDSwiftLintFastlaneGitHub ActionsXcode CloudTestFlight
Monetisation & Observability: StoreKit 2RevenueCatFirebaseCrashlyticsAnalyticsRemote Config