iOS app development

Teams searching for iOS development are usually past the platform debate: the product will live on iPhones, and it has to clear Apple's gate. For regulated products – banking, payments, identity – that choice carries real weight, because the iPhone's security model becomes part of your compliance story. Biometric login, hardware-backed key storage and the App Store's review regime are not features you bolt on at the end; they shape the architecture from the first sprint.

That is the work WislaCode does: native Swift builds for products where security review, audit and App Store approval are part of the definition of done. The reference point is our mobile banking build for a bank with 700,000+ customers – a move from a basic feature set to a digital bank where everything can be done online, first release in six months. The same model applies whether you are launching a new product or replacing an app your customers have outgrown: a small senior team, design and engineering synchronised, and production quality from day one rather than a prototype that gets rewritten later.

If you are still weighing one shared codebase against two native apps, start with cross-platform development.

Apple's review is a hard gate between code-complete and live, and it is where inexperienced teams lose weeks. Permission prompts that do not explain why the app needs them, missing privacy declarations, sign-in flows that break Apple's account rules, payment screens that drift into guideline territory – each one is a rejection, and each rejection restarts the queue. Financial apps get looked at harder: reviewers expect account opening, money movement and data handling to be demonstrably in order, and they need a working demo account to test against.

We treat review as an engineering constraint rather than a formality at the end. Guideline requirements go into the backlog next to functional ones, privacy declarations are written alongside the features that trigger them, and reviewer notes and demo credentials are prepared as deliverables, not scrambled together on submission day. Submissions are timed so a rejection cannot move the launch date, and the response to a rejection – what we appeal, what we change, how fast we resubmit – is agreed in advance. Phased rollout is the default for first releases, so an issue in production reaches a fraction of users instead of all of them.

To see this discipline carried through a regulated product, read the Swift and Kotlin banking build.

We build in Swift and choose between SwiftUI and UIKit per product, not by fashion: the minimum iOS version you need to support, the complexity of custom interactions and how long each screen has to live decide the split. Architecture is modular, so features build, test and ship independently – which is also what makes a security audit tractable. The security layer leans on what Apple's hardware already provides instead of reinventing it:

• Face ID and Touch ID login, with keys held in the Secure Enclave
• Keychain storage and certificate pinning for credentials and transport security
• Apple Pay where the product moves money, push notifications through APNs
• Privacy-by-design data handling that matches the App Store declarations

Ecosystem and tooling work sits inside the same scope: App Store Connect setup, TestFlight distribution and the signing and provisioning machinery every iOS team eventually fights are handled in the engagement, not left as an exercise for your staff. The result feels native because it is native, and it passes a dependency review without an exotic third-party list attached.

An honest iOS quote starts with an admission: nobody can price your app from a phone call. What we can name up front is where iOS budgets actually go. Apple's narrow device range keeps the testing matrix manageable, so the spend concentrates elsewhere: in the integrations behind each journey – core platforms, KYC providers, payment rails – in the security and audit evidence a regulated product has to carry, and in the review-readiness work described above. That is why we scope before we quote: the first deliverable is a mapped backlog with estimates and explicit assumptions, so you are challenging a feature list rather than accepting a single number.

Engagements run in two shapes: a fixed-scope build with a defined release, or a dedicated team that carries the roadmap past launch. For calibration on pace rather than promises: the mobile banking app in our case work reached its first release in six months, and the review on this page from Aleksei Malenkin, CTO of $lana (Monetech), singles out the speed of delivery. Timelines like these come from running design, engineering and review preparation in parallel, not from cutting the testing budget.

When the roadmap needs both platforms moving in step, pair this work with Android app development.

An iOS app stays inside Apple's machinery for as long as it is on the store: every update goes back through the same review that gated the first release, and Apple sets deadlines of its own – within months of each major iOS release, new submissions must be built against the current SDK. Because iPhone users adopt new versions quickly, any change in system behaviour reaches most of your customer base within weeks.

Our post-release scope is built around that reality. Crash and performance monitoring is wired to alerting an engineer actually receives, releases run on a train so fixes and features batch into predictable review submissions, and signing assets and push credentials are renewed on a calendar rather than after an outage. When Apple publishes developer betas, we test against them before your customers do, so version-day surprises surface in our pipeline first.

This is also where the engagement settles into a steady shape: a maintenance retainer for compatibility and fixes, or a continued product team for a roadmap that keeps moving. Either way, the discipline that got the app through review the first time stays in place.