Hire Swift Developers for Every Apple Platform

How to vet a Swift developer

A Swift specialist goes beyond building screens. Look for a solid grasp of the language itself: value and reference semantics, protocols and generics, error handling, memory management and Swift concurrency with actors and Sendable types. These skills matter most in shared modules, SDKs and complex business logic, where design mistakes spread across the whole codebase.

Ask candidates about migrations they have led, such as moving code to Swift concurrency or enabling stricter checking for Swift 6, and how they kept the app stable while doing it. Strong developers explain their reasoning with concrete examples and know when a simpler design beats a clever abstraction.

Context matters when choosing a Swift specialist rather than a general iOS developer. Libraries, SDKs, shared business logic and large migrations benefit from deep language expertise, while feature work on screens usually needs broader platform knowledge, so define the work before writing the job profile.

• Clear understanding of structs, classes, protocols and generics.
• Experience with Swift concurrency and data race safety.
• Designs clean public APIs for modules and packages.
• Writes testable code with dependency injection.
• Keeps up with language evolution and migration tooling.

Interview questions we use for Swift developers

These questions test depth in the language. We expect candidates to write or sketch small code examples and to discuss how their choices affect performance, safety and readability. We also ask how they would explain a design choice to a junior teammate, since clear reasoning matters as much as the right answer.

• When do you choose a struct over a class, and what changes when you do?
• Show protocol-oriented design solving a real problem from your work.
• What changes in a codebase when strict concurrency checking is enabled?
• How would you design a generic network client with typed errors?
• How do actors and Sendable types work together to prevent data races?
• How do you test asynchronous code reliably?

Onboarding a Swift developer in the first two weeks

During the first week, the developer learns the codebase's conventions: module structure, dependency injection approach, concurrency patterns and how code is tested. They pair with an existing team member on a small change, review open pull requests to understand standards, and identify areas where language features are used inconsistently. Pairing speeds this up.

In week two, they deliver a focused improvement, such as refactoring a module to modern concurrency or tightening a shared API, with tests and documentation. The team lead and developer then agree a plan for larger work, for example a staged migration to stricter compiler checks, with clear milestones and risk controls.

Teams comparing Apple's language with Android's often find our Swift vs Kotlin comparison useful context. A Swift specialist can also help both mobile teams align on shared patterns, such as error handling and networking layers, so behavior stays consistent across platforms.