The short version

A mobile developer builds the apps your customers run on their phones, whether native for iOS and Android or cross-platform from a single codebase. Hiring one on contract or through a vetted network lets you add proven app-building capability in days, which matters most when you have an app to ship, update, or rescue and no in-house mobile skill to do it.

• Typical engagement: 3 to 12 months on contract, often tied to a build or a release cycle
• Day rates in Australia: A$700 to A$1,300/day depending on seniority, platform, and app complexity
• Specialisations: native iOS (Swift), native Android (Kotlin), and cross-platform with React Native or Flutter
• Hire one when: you need an app built, an existing app updated or fixed, or a specific platform skill your team lacks
• Time to deploy: curated shortlists in 48 hours via Expert360
• Engagement types: contract, project-based, fractional, or interim

What is a mobile developer?

A mobile developer builds applications that run on smartphones and tablets. The work splits along two lines. Native developers build for one platform using its own tools and language, Swift for iOS or Kotlin for Android, which gives the best performance and deepest access to device features. Cross-platform developers use a framework such as React Native or Flutter to build for both iOS and Android from a single codebase, which is faster and cheaper when the app does not need deep platform-specific features.

In Australia, demand for contract mobile developers comes from businesses launching a customer app, modernising an ageing one, or adding mobile to an existing product, across retail, financial services, health, media, and startups. The native-versus-cross-platform choice is the defining decision, and it drives both cost and the kind of developer you need. Cross-platform frameworks have matured to the point where they cover most builds, with native reserved for performance-critical or hardware-heavy apps.

The title sits alongside several related ones. The short version:

• iOS developer: a mobile developer specialised in Apple's platform, usually in Swift.
• Android developer: a mobile developer specialised in Google's platform, usually in Kotlin.
• React Native or Flutter developer: a cross-platform mobile developer building both platforms from one codebase.
• Front-end engineer: builds web interfaces; related skills, but mobile apps are a distinct discipline.

When you describe your app to Expert360, we help you work out whether native or cross-platform, and which platform skills, the build actually needs.

When should you hire a mobile developer?

The trigger is usually that you have an app to build, fix, or improve, and no in-house mobile capability to do it well. A contract mobile developer is the right call when that work is real and time-bound.

• You're building a new app. A customer-facing or internal app needs building, and you need someone who has shipped apps to the stores before.
• You're modernising an existing app. An ageing app needs rebuilding to current standards, or migrating to a new framework.
• You need a specific platform skill. A build needs deep iOS, Android, React Native, or Flutter expertise your team does not have.
• Your app has problems. Crashes, poor performance, battery drain, or app store rejections need someone who knows the platform's quirks.
• You're adding mobile to a product. An existing web product needs a mobile app, and that is a distinct build from your web work.
• You're covering a gap. A key mobile developer has left mid-project and you need continuity while you recruit.

If two or more of these match, a contract mobile developer is likely the right next step.

How much does a mobile developer cost in Australia?

Rates vary with seniority, the platform, and how complex the app is. Native specialists in scarce skills and apps needing deep device integration sit higher.

The below rates are indicative only. Experts in our network set their own rates, and you'll be able to compare real rates after requesting a talent shortlist.

Mid-level mobile developer: A$700–A$950/day

Typically 3 to 6 years' experience, building and shipping apps in a defined platform or framework with limited supervision. Suits steady feature delivery and standard app builds.

Senior mobile developer: A$950–A$1,150/day

Usually 6 to 10 years' experience, owning app architecture, handling complex platform features, and shipping reliably to the app stores. Suits complex apps and teams needing technical leadership on mobile.

Lead or specialist developer: A$1,150–A$1,300/day

Deep expertise in a scarce platform skill, performance-critical or hardware-heavy native work, or technical leadership of a mobile team. Native specialists for demanding apps sit at the top of this band.

On a fractional basis, expect roughly A$8,000 to A$17,000 per month for 2 to 3 days a week, which suits ongoing mobile oversight or maintenance without a full-time hire. Rates rise for scarce native skills and demanding apps, and ease for longer commitments.

What drives the variance:

• Native versus cross-platform: native specialists for demanding apps command more than cross-platform generalists
• App complexity: deep device integration, real-time features, and performance demands raise the rate
• Platform scarcity: strong native iOS and Android skills are scarcer than cross-platform
• Engagement length: longer contracts often come with a lower day rate

It is worth separating developer rates from total app cost. A medium-complexity app in Australia often runs from tens of thousands into six figures depending on scope, and cross-platform builds typically save a significant share against building two native apps. For comparison, a permanent mobile developer earns roughly A$100,000 to A$160,000 base depending on platform and level, or higher fully loaded with superannuation and on-costs. A contract developer costs more per day but adds no on-costs, ramps fast, and ends cleanly when the work does.

Native vs cross-platform – what's the difference?

This is the central decision in mobile, and it shapes which developer you hire. Here is how it plays out in practice.

Native development builds separately for each platform, Swift for iOS and Kotlin for Android, giving the best performance, the smoothest feel, and the deepest access to device features. The cost is building and maintaining two codebases. Best for performance-critical apps, games, and apps that lean heavily on device hardware.

Cross-platform development uses React Native or Flutter to build both platforms from one codebase, with most code shared and only a small share platform-specific. It is faster to build and cheaper to maintain. Best for most business apps, where the savings are real and the feature needs are standard.

The practical point: for the majority of apps, cross-platform is the sensible default and a cross-platform developer is the right hire. Reach for native specialists when performance or deep hardware integration genuinely demands it. The costly mismatch is building two native codebases for an app that did not need them, or forcing a performance-critical app onto cross-platform. When you describe your app to Expert360, we help you make this call before you hire.

What does a mobile developer actually do?

The day-to-day varies by platform and app, but most contract mobile developers cover some combination of the following.

• Build the app. Writing the code that delivers the app's features, in the chosen platform or framework.
• Build the interface. Creating screens that follow each platform's design conventions and feel right to users.
• Integrate with backends and devices. Connecting the app to APIs and to device features like the camera, location, notifications, and biometrics.
• Handle performance and offline behaviour. Making the app fast, responsive, and sensible when the connection drops, which matters more on mobile than web.
• Ship to the app stores. Navigating Apple's and Google's review processes, which have rules that catch out the inexperienced.
• Maintain and update. Keeping the app working as the operating systems and devices change, which is ongoing rather than one-off.
• Test across devices. Making sure the app works across the range of phones and screen sizes your users actually have.

A contract engagement usually starts with a short ramp-up on the app, its codebase, and the target platforms, then moves into steady delivery, with a senior developer also shaping app architecture and release process along the way.

How to choose the right mobile developer

The real risk in hiring a mobile developer is rarely whether they can write code. It is whether they fit your platform choice, have actually shipped apps to the stores, and leave an app your team can maintain.

• Platform fit. Match the developer to your native or cross-platform choice and the specific platform. A strong iOS developer is not automatically a strong Flutter one.
• Evidence of shipped apps. Ask for apps they have built that are live in the stores. A published app you can download tells you more than a CV.
• App store experience. Getting through Apple and Google review is a skill in itself. Ask about rejections they have handled and how.
• Right seniority for the work. Pay for senior judgement where app architecture and complex features matter, and mid-level delivery where the path is clear.
• Maintenance mindset. Apps need ongoing updates as operating systems change. Ask how they build for maintainability, not just launch.
• References from real apps. A reference from a product owner or engineering lead they worked under tells you most. Ask whether the app shipped, performed, and held up.

Every mobile developer in the Expert360 network is vetted for real app-building experience and reference-checked against the platforms they claim, so the shortlist you see reflects developers who have shipped apps like yours.

Frequently asked questions

What does a mobile developer do?

A mobile developer builds applications for smartphones and tablets. They write the app's code, build its interface to platform conventions, integrate with backends and device features, handle performance and offline behaviour, ship to the app stores, and maintain the app as operating systems change.

Should I build a native or cross-platform app?

For most business apps, cross-platform with React Native or Flutter is the sensible default: one codebase for both iOS and Android, faster to build and cheaper to maintain. Choose native, with Swift or Kotlin, when the app is performance-critical or leans heavily on device hardware. The choice drives which developer you hire.

How much does it cost to hire a mobile developer in Australia?

Contract mobile developers in Australia typically charge A$700 to A$1,300 per day. Mid-level developers sit around A$700 to A$950/day, senior developers A$950 to A$1,150/day, and native specialists for demanding apps A$1,150 to A$1,300/day. Total app cost is separate and depends on scope.

What's the difference between an iOS and an Android developer?

An iOS developer builds for Apple devices, usually in Swift; an Android developer builds for Google's platform, usually in Kotlin. They are distinct native skills. A cross-platform developer using React Native or Flutter can build for both from one codebase, which suits most business apps.

Do I need separate developers for iOS and Android?

Only if you build native. Two native apps need iOS and Android skills, often two developers. A cross-platform build needs one developer or team working in React Native or Flutter, which is the main reason cross-platform is cheaper for most apps.

What about ongoing app maintenance?

Apps need regular updates as Apple and Google release new operating systems and devices, or they break. Budget for ongoing maintenance, not just the build. A fractional or retained mobile developer is a common way to cover this without a full-time hire.

How quickly can I hire a mobile developer through Expert360?

Expert360 provides a curated shortlist of vetted mobile developers within 48 hours of you describing your needs. Because the network is pre-vetted, you can typically have a developer engaged and starting within one to two weeks, far faster than a permanent search.

Can a mobile developer work remotely?

Yes, mobile development suits remote and hybrid work, and many contract developers work this way. Some teams value on-site time for onboarding and collaboration, and government engagements may require on-site presence and a security clearance.