21 Swift Developers to match Apple's tech and design standards

Swift developers at Cortance are chosen for the parts of an Apple app that users never see: concurrency, memory, packages and the Objective-C code many apps still carry. Together, they list 100+ Swift projects, as of October 2026, from an iPad app connected to an implanted medical device to the IHG Hotels & Rewards app.

We match on that project history, not on the word Swift in a resume. Two engineers with the same years of Swift can have spent them on very different problems.

Can a Swift developer move a GCD codebase to async/await without freezing releases?

Yes, if the move goes one module at a time and new code stops adding to the old pattern first. Grand Central Dispatch still dominates the Swift work in our network: it appears in 18 projects, against 8 that use async/await. The trap is switching the whole app to the Swift 6 language mode in one step. That mode reports possible data races as compiler errors. A codebase full of callbacks that touch shared state will not build until someone decides which actor owns each piece of it.

Ruslan M. has worked on both ends of that path in 14 years in software. He shipped Objective-C apps such as the Hosteeva guest and partner apps. His recent projects, including the AI-powered interior redesign app VisionRoom AI, where he was the only iOS developer, run on async/await and Combine. When a brief mentions a concurrency migration, engineers with that kind of history go to the top of our shortlist.

Memory leaks and slow screens found in Instruments, before users find them

Swift's automatic reference counting frees most memory on its own, which is why the leaks that remain are hard to spot. A closure or Combine subscription that captures self strongly can keep a whole screen alive after the user has left it. The fix is usually one line; finding it takes Instruments and patience.

On the IHG Hotels & Rewards app, Agil M. made the app 30% faster and cut memory use by 25% by caching images and loading them lazily. On Automattic's Simplenote, he profiled the app with the Allocations, Leaks and Time Profiler tools. If your problem is a slow or crashing app rather than a missing feature, say so in the brief, and we shortlist engineers whose projects show profiling work.

Swift packages and SDKs that other teams build on

A growing Swift app eventually splits into modules, and each module becomes code that other people depend on. Swift Package Manager appears in 25 Swift projects in our network, CocoaPods in 21, and many older apps carry both. Moving a dependency from one to the other is routine. Deciding what a module exposes publicly is not, because every public type becomes a promise to the teams that import it. We look for engineers who have shipped such a boundary: an NFC identity SDK, a separate analytics framework, firmware updates pushed to audio hardware from four chip vendors.

Let Xcode's coding agents draft the code, and keep a Swift engineer on the review

Since February 2026, Xcode 26.3 can run Anthropic's Claude Agent and OpenAI's Codex inside the IDE, where they build the project, run tests and read Apple's documentation. Swift adds a specific review risk to that workflow. When the compiler reports a data race, the quickest way back to a green build is to mark a type as @unchecked Sendable or a variable as nonisolated(unsafe). Both silence the check without making the code thread-safe, so every concurrency annotation an agent adds needs a person who reads it.

For clients whose teams already work with Xcode agents, Cortance shortlists engineers with Swift Concurrency project history. They can tell a fixed race from a silenced one.

Tell us which Swift version the app builds with, whether Objective-C files are still in the target, and what the next release has to ship. We send engineers whose project history fits, you interview the ones you like, and the one you choose can start within 2 days.