iOS app development services: senior Swift and SwiftUI teams
Senior iOS teams that build Swift and SwiftUI apps for iPhone, iPad and Apple Watch, and keep them fast, accessible and passing App Review release after release.
By the Ryz Labs team · Updated October 2026
Ryz Labs provides iOS app development services through senior teams that build Swift and SwiftUI apps for iPhone, iPad and Apple Watch and ship them through App Review. Our iOS engineers are in the top 1% of the tens of thousands we interview, work on US business hours, and handle everything from a new app to modernizing a large UIKit codebase and adopting each year's iOS release.
What we build
iOS users expect apps to feel native: smooth scrolling, system gestures, Dynamic Type, and features that show up on the Lock Screen and in Siri. These are the iOS deliverables our teams own.
- New SwiftUI apps: built on the Observation framework, NavigationStack and Swift concurrency, with a modular structure in Swift Package Manager so several engineers can work without collisions.
- UIKit to SwiftUI modernization: moving screens incrementally with UIHostingController, keeping navigation and state consistent between old and new code, with no big-bang rewrite.
- Swift 6 concurrency migration: turning on strict concurrency checking, fixing data races with actors, @MainActor and Sendable, and removing legacy completion-handler code.
- System surfaces: WidgetKit widgets, Live Activities and Dynamic Island, App Intents for Siri, Shortcuts and Spotlight, and notification actions.
- Subscriptions and payments: StoreKit 2 subscriptions with server-side receipt validation through App Store Server API and notifications, plus Apple Pay for physical goods.
- Offline-first data: SwiftData, Core Data or GRDB with background sync, conflict handling and migrations that don't lose user data on update.
- Companion apps: watchOS apps and complications, iPad layouts with multitasking, and CarPlay or HealthKit integrations where your product calls for them.
Shipping on Android too? See Android app development or our cross-platform options under mobile app development.
How an engagement works
- Talk. We look at your app or designs, crash and hang reports from Xcode Organizer, App Store ratings and what blocks your releases today.
- Match. We propose iOS engineers (plus back-end or QA if needed) with names and a monthly price.
- Join. The team gets access to your repo, App Store Connect and signing setup, joins standups and design reviews on US hours, and starts with small fixes that prove the pipeline.
- Grow. Keep the team on a release cadence, add Android or back-end engineers, or hand the app to your in-house iOS developers.
Week 1 is a clean build locally and in CI, a review of signing and provisioning, and reading crash logs to find the top issues. Month 1 typically includes a TestFlight build with fixes or a first feature. By month 3, the team releases on a regular cadence with phased releases and owns stability metrics. Pace depends on scope, design readiness and your onboarding.
The stack our teams work in
| Layer | Tools we use | Notes |
|---|
| Language and UI | Swift 6, SwiftUI, UIKit, Combine where it already exists | SwiftUI for new screens, UIKit interop as needed |
| Architecture | MVVM, The Composable Architecture, Swift Package Manager modules | We follow your existing pattern unless it is the problem |
| Data | SwiftData, Core Data, GRDB, URLSession, Keychain | Versioned schema migrations |
| Apple frameworks | WidgetKit, ActivityKit, App Intents, StoreKit 2, HealthKit, MapKit | Adopted when they serve the product |
| Testing | Swift Testing, XCTest, XCUITest, snapshot tests | Tests run on every pull request |
| CI/CD | Xcode Cloud, fastlane (match, pilot), GitHub Actions, Bitrise | Signing automated, TestFlight on merge |
| Monitoring | Xcode Organizer, MetricKit, Crashlytics, Sentry | Crashes, hangs, launch time and battery |
How we keep iOS apps fast and crash-free
Most iOS quality problems fall into a handful of categories. A senior iOS team prevents them structurally rather than chasing them one report at a time.
- Data races and main-thread violations. UI updates from background tasks cause crashes that are hard to reproduce. Swift 6 strict concurrency checking, actors and @MainActor isolation turn many of these into compile errors.
- Hangs and slow launches. The team tracks hang rate and launch time in Xcode Organizer and MetricKit, profiles with Instruments, and moves heavy work off app launch.
- Memory leaks. Retain cycles in closures and delegates keep screens alive. The memory graph debugger and leak checks in UI tests catch them before release.
- App Review rejections. Privacy manifests with required-reason APIs, App Tracking Transparency, in-app account deletion and correct use of in-app purchase are checked before submission, not after a rejection.
- The September iOS release. Each new iOS version changes behavior. Our engineers test on the betas over the summer, adopt new SDK requirements, and ship a compatible build before launch day.
- Signing and certificate expiry. Certificates and profiles are managed with fastlane match or Xcode Cloud, so an expired certificate never blocks an urgent fix.
- Accessibility gaps. VoiceOver labels, Dynamic Type and sufficient contrast are part of the definition of done, verified with Accessibility Inspector.
Team shapes and cost
Typical Ryz cost is $7,000–$15,000 per engineer per month, mostly mid-level to senior: mid-level (comparable to Amazon L5) $7,000–$10,000, senior (comparable to Amazon L6) $10,000–$15,000, and leads $15,000+, quoted per team.
- iOS pair: 2 senior iOS engineers working on your existing app. 2 × $10,000–$15,000 = $20,000–$30,000 per month.
- New app team: 2 senior iOS engineers, 1 back-end engineer and 1 QA engineer. 4 × $7,000–$15,000 = $28,000–$60,000 per month, depending on seniority mix.
- Modernization team: an iOS tech lead plus 3 senior iOS engineers for a large UIKit to SwiftUI migration. 3 × $10,000–$15,000 = $30,000–$45,000, plus the lead at $15,000+, so $45,000+ per month.
You get a scoped plan, a price and the names of the people before you start.
Dedicated team or staff augmentation?
A dedicated development team fits a new iOS app or a major rebuild where one team owns implementation, back end and release. Staff augmentation fits when you have an iOS lead and a roadmap and need more senior hands: iOS developers and Swift developers who work on your team and follow your release train.
When Ryz isn't the right fit
If you need a quick prototype from a self-serve freelance marketplace, or engineers on European or Asian hours, other providers fit better. If you are deciding whether you need an iOS app at all, a product strategy engagement comes first.
Related
FAQ
How much do iOS app development services cost with Ryz?
Typical cost is $7,000–$15,000 per engineer per month, mostly mid-level to senior, with leads at $15,000+ quoted per team. Total cost is team size × duration × monthly rate: two senior iOS engineers for 6 months is 2 × 6 × $10,000–$15,000 = $120,000–$180,000.
How fast can an iOS team start?
After the scoping call we propose a team with named engineers. Most of the timeline depends on scope and your onboarding, including access to your repo and App Store Connect.
Do you use SwiftUI or UIKit?
SwiftUI for most new work, UIKit where an existing app depends on it or SwiftUI lacks a capability. Our engineers are fluent in both and mix them deliberately.
Can you handle App Store submission?
Yes. The team prepares builds, metadata, privacy details and review notes, and submits under your Apple Developer account, which you own.
Do you build for iPad and Apple Watch?
Yes. We build adaptive iPad layouts and watchOS companion apps and complications when the product needs them.
Questions we didn't answer? Email info@ryzlabs.com.