Hire senior Swift engineers in your time zone.

A senior Swift engineer is responsible for far more than writing views. They own the architecture decisions that determine whether an app stays maintainable two years and a dozen iOS releases later.

Interface and state architecture. They decide how state flows through the app, whether that is SwiftUI's native state management, the Observation framework, or a Combine-based pipeline feeding older UIKit screens. Getting this wrong shows up later as bugs that only appear on specific navigation paths or after backgrounding the app.

Concurrency and performance. Swift's structured concurrency with async/await and actors removes a lot of the historical pain of multithreaded iOS code, but it still requires a real understanding of data isolation. A senior engineer knows when a task should run on the main actor, when it should not, and how to use Instruments to find the one screen that is dropping frames.

Release ownership. Shipping to the App Store is not a one-time event. A senior engineer manages certificates and provisioning profiles, runs TestFlight betas, handles App Store review rejections calmly, and plans phased rollouts so a bad release does not reach every user at once.

Cross-platform consistency. On teams shipping to iPhone, iPad, Mac, and Apple Watch from one codebase, they decide what is truly shared logic versus what needs a platform-specific interface, keeping the codebase from splintering into duplicated logic.

Swift development lives inside a specific, opinionated toolchain, and depth here separates engineers who can ship reliably from those who fight the tools.

Xcode and build configuration. Beyond writing code, this means understanding build settings, schemes, and how signing and provisioning actually work, since misconfigured signing is one of the most common causes of failed releases.

SwiftUI and UIKit interoperability. Most production apps are not purely one or the other. A strong hire knows how to bridge UIKit view controllers into SwiftUI and back, especially on apps with years of UIKit history being modernized incrementally.

Dependency management. Swift Package Manager has largely replaced CocoaPods for new projects, but many production codebases still run CocoaPods or a mix of both, so comfort with both matters.

Release tooling. Fastlane and Bitrise automate the repetitive parts of building, signing, and distributing to TestFlight, and a senior engineer should be comfortable maintaining these pipelines, not just running them.

Testing. XCTest for unit tests and XCUITest for UI tests are the backbone of confidence in a release, and engineers should have real habits here rather than treating tests as an afterthought before submission.

The fastest way to separate genuinely senior Swift engineers from those who have only worked on small or short-lived apps is to ask about production realities, not textbook syntax.

Start by asking for App Store links to apps they actually built, and ask what they owned versus what a team shipped around them. A candidate who can walk through specific screens, explain a tricky bug they fixed, and describe how a feature evolved across App Store versions is showing you real ownership.

Ask them to describe how they would structure state for a moderately complex SwiftUI screen, such as a form with validation and async loading. Their answer reveals whether they understand SwiftUI's data flow or are pattern-matching from tutorials.

Probe concurrency directly: ask about a time a background task caused a UI bug, and how they diagnosed and fixed it. Strong candidates talk comfortably about actors, the main actor, and Instruments.

Finally, ask about their last App Store rejection and how they resolved it. Every experienced iOS engineer has one, and how they handled it tells you how they will handle the next one on your app.

BetterEngineer already runs this kind of evaluation, covering SwiftUI architecture, concurrency, and release process, before you ever speak to a candidate.

Quick evaluation checklist:

• Ask for App Store links to apps they built and shipped, not just prototypes
• Review how they structure a SwiftUI view hierarchy and manage state
• Check their handling of concurrency: async/await, actors, and avoiding data races
• Probe their approach to App Store review issues and crash triage
• Assess testing habits with XCTest and whether CI runs on every pull request