What Do Mobile App Developers Do? Role, Skills, Tools, Salary and How to Become an App Developer
What mobile app developers do day to day
In this article
Mobile app developers design, build, test and maintain applications for smartphones and tablets, typically for iOS (Swift), Android (Kotlin) or both using cross-platform frameworks like Flutter or React Native. They turn designs into working screens, connect apps to backends and APIs, handle data and security, fix bugs, publish to app stores and keep apps updated as operating systems change.
What a mobile app developer does day to day
| Task | Details |
|---|---|
| Planning | Review requirements and designs, estimate work |
| Building UI | Screens, navigation, animations, accessibility |
| Business logic | Features, state management, offline behaviour |
| Integration | APIs, authentication, payments, maps, push notifications, AI features |
| Data | Local storage, sync, caching |
| Testing | Unit, UI and device testing; fixing bugs |
| Performance and security | Battery, memory, secure storage, permissions |
| Publishing | Builds, signing, App Store and Google Play submissions |
| Maintenance | OS updates, library upgrades, crash fixes |
| Collaboration | Designers, backend developers, product managers, QA |
Types of mobile developers
| Type | Technologies |
|---|---|
| iOS developer | Swift, SwiftUI, Xcode |
| Android developer | Kotlin, Jetpack Compose, Android Studio (see How to build an Android app) |
| Cross-platform developer | Flutter (Dart), React Native (JavaScript/TypeScript) |
| Mobile full-stack | App + backend (Node.js, Firebase, Supabase) |
Skills needed
- A primary language (Swift, Kotlin, Dart or JavaScript/TypeScript)
- UI frameworks and design implementation
- APIs, JSON, authentication
- Local storage and data sync
- Git and version control
- Testing and debugging tools
- App store processes (see How to publish an app on the App Store)
- Soft skills: communication, problem-solving
How much does an app developer earn?
In the US, mobile app developer salaries commonly range from around $80,000 to $150,000+ depending on experience, location and company, with senior and specialised roles higher. Freelancers often charge hourly rates from about $40 to $150+. Earnings vary significantly by country.
How to become an app developer
- Choose a platform/framework (Flutter or React Native for both platforms; Kotlin or Swift for native)
- Learn programming fundamentals
- Complete an official course (e.g., Android Basics with Compose, Apple's SwiftUI tutorials)
- Build 3–5 portfolio apps solving real problems
- Publish at least one app to a store
- Learn backend basics and APIs
- Contribute to open source or freelance small projects
- Apply for junior roles or internships
(Hands-on: How to make an app, How hard is it to make an app?)
How AI is changing app development
AI coding assistants speed up boilerplate, tests and debugging, and AI app builders generate prototypes. Developers increasingly focus on architecture, reviewing AI output, integrating AI features and delivering quality.
Frequently asked questions
What do mobile app developers do?
They design, build, test, publish and maintain apps for phones and tablets, connecting them to backends and keeping them updated.
What skills do app developers need?
A programming language like Kotlin, Swift, Dart or JavaScript, UI implementation, APIs, data storage, testing, Git and app store publishing.
How much does an app developer earn?
In the US, often around $80,000–$150,000+ per year depending on experience and location; freelancers charge varied hourly rates.
How long does it take to become an app developer?
Typically six months to two years of consistent learning and building projects.
Do app developers need a degree?
Not necessarily; a strong portfolio of published apps and practical skills often matters more.
Is app development a good career?
Yes, demand remains strong, especially for developers who combine mobile skills with backend, AI integration and product sense.
Want this built for your business?
I design and build AI agents and automations that run in production, not just in demos. Tell me which process is eating your team's week.
Start a conversationWritten by Sachin Rawat
AI & automation engineer · websites, apps and motion design
I build AI agents, automations, websites, apps and motion design for businesses. These guides answer the questions people actually search, written from hands-on experience building them.
Work with meMore stories