# Swift Skills Test and Verified Swift Score > A Swift skills test for iOS developers, plus live SwiftUI sessions with practitioners and repositories connected through GitHub. Prove your Swift skills. Source: https://getlemma.io/skills/swift An app on a personal phone is a start, but it rarely shows how you think. Lemma records your Swift through live sessions with practitioners, adaptive assessments and the repositories you connect. How Swift is assessed ## What Swift competence looks like A capable Swift developer leans on the type system: optionals are unwrapped deliberately, enums with associated values model state, and protocols describe behaviour. They pick value types by default and know when a class is genuinely needed. Memory issues such as retain cycles in closures are something they spot early. In iOS work, they manage SwiftUI state with the right property wrappers, keep views small, and move side effects out of the view layer. They use async and await with structured concurrency and actors to keep data races out, and they know how to profile a slow scroll or a launch that drags. ### Optionals and types Optionals, enums with associated values, generics and protocols used to model state precisely. ### SwiftUI state State, bindings and observable models, and where each piece of state should live. ### Structured concurrency Async and await, tasks, actors and avoiding data races on the main thread. ### Memory management Reference counting, weak and unowned references, and retain cycles in closures. ### App architecture Separating views, models and services so features stay testable as the app grows. ### Performance profiling Using Instruments to find slow renders, heavy launches and excessive memory use. ## What counts as evidence of Swift skills? An app store link does not say who built what. Lemma records Swift evidence that does: sessions with another developer, an adaptive test and repositories linked from your own account. Each entry below shows its source. See the [evidence methodology](https://getlemma.io/methodology#evidence-types) for how each source is weighed. [Live session](https://getlemma.io/product/sessions) ### SwiftUI build session with a practitioner Build or refactor a screen live while an iOS practitioner watches your state handling and architecture. Their rating becomes Swift evidence. [Adaptive assessment](https://getlemma.io/product/assessments) ### Adaptive Swift assessment Scenarios cover optionals, concurrency and memory. Harder rounds describe a problem such as a retain cycle or a data race, and you choose the correct diagnosis. [GitHub connector](https://getlemma.io/product/passport) ### An iOS project on GitHub Connect a repository or commit from a Swift project. Lemma checks that it exists and that your account can access it. [Live session](https://getlemma.io/product/sessions) ### Teaching Swift concepts Teach a session on concurrency or SwiftUI state to someone learning. Teaching counts for more than learning, because explaining it well takes depth. ## How is a Swift skills test run on Lemma? The Swift test adapts as you go, between 15 and 25 questions on device, lifecycle and offline problems, getting harder while you answer correctly. Together with sessions and linked work it sets your Swift SCI, where older evidence slowly counts for less. [How the SCI score is calculated](https://getlemma.io/product/sci)[How adaptive skills assessments work](https://getlemma.io/product/assessments)[Practise Swift in live skill swap sessions](https://getlemma.io/product/sessions)[Which evidence types count](https://getlemma.io/methodology#evidence-types)[What your Skills Passport shows](https://getlemma.io/product/passport) 1. ### Build a screen together In a live session you work on a SwiftUI view or a networking layer with an iOS practitioner. They look at how you model state, handle errors and keep the main thread free. 2. ### Take the adaptive assessment Questions adjust to your answers and cover the type system, SwiftUI, concurrency and memory. Each realistic scenario is timed, harder ones count for more, and you can't go back. 3. ### Connect your iOS code Link your Swift repositories through GitHub. Keep practising and taking sessions, because recent evidence counts for more than old work. ## Swift skills: common questions ### How do I prove iOS development skills without an App Store app? An App Store listing helps but isn't required. Build or refactor SwiftUI screens in live sessions with an iOS practitioner, pass the adaptive Swift assessment, and connect your repositories through GitHub. That shows how you build, not just that you shipped once. ### What Swift topics come up in iOS interviews? Optionals and error handling, value versus reference types, retain cycles, SwiftUI state management and async and await with actors. Lemma's Swift assessment and sessions cover the same areas, so they double as interview preparation. ### Should I learn SwiftUI or UIKit first? SwiftUI is where most new iOS work starts, but many production apps still mix in UIKit. Learn SwiftUI well and be able to read UIKit code. Lemma's Swift evidence focuses on the language and modern SwiftUI patterns. ### Does Swift evidence also count as mobile development evidence? Not automatically. Swift is tracked as a language skill and mobile development as a broader skill covering platform concerns like offline behaviour and release flow. You can build evidence for both, and each score stays specific. ## Skills related to Swift [Browse the skills directory](https://getlemma.io/skills) [### Mobile development Evidence for building mobile apps that work offline, stay fast and survive real devices. Evidence for mobile development](https://getlemma.io/skills/mobile-development)[### Kotlin Evidence for idiomatic Kotlin, coroutines and Android development, recorded from real work. Evidence for Kotlin](https://getlemma.io/skills/kotlin)[### UI/UX design Show that your interfaces are usable, accessible and consistent, not just attractive. Evidence for UI/UX design](https://getlemma.io/skills/ui-ux-design) ![Painting of an olive grove in soft sunlight with hills beyond](https://cdn.sanity.io/images/islu4peo/production/613eb3f93566423c9adf45246f2cf1a61437c04c-1680x1120.jpg?w=1080&fm=webp&q=68&fit=max) ## Start your Swift evidence record. Lemma is in early access. Request an invite and we will email you when your place is ready.