Kotlin App Development Services
Modern, concise code for Android and beyond.
Kotlin is a modern programming language, and Google's preferred language for building Android apps. It is also used on servers and, through Kotlin Multiplatform, to share code across platforms. NetOfficials provides Kotlin app development services for B2B clients, from native Android apps to shared business logic. The full Android build process is covered by our Android app development services.
- Engagement models
- 3
- Every project has
- A named lead
- Signed before details
- Mutual NDA
- Confirmed in the contract
- Your IP
What We Build With Kotlin
Kotlin covers more than phone screens. These are the kinds of things we build with it.
Native Android Apps
Apps that use the full Android platform, from the camera to background work.
Jetpack Compose Interfaces
Screens written declaratively, with less boilerplate than older view layouts.
Java to Kotlin Conversion
Move an older Java Android app to Kotlin in steps while it keeps shipping.
Shared Business Logic
Use Kotlin Multiplatform to share networking and rules between Android and other platforms.
Kotlin Back Ends
Server code in Kotlin where a team wants one language across app and API.
Tested App Code
Unit and interface tests built alongside features so releases stay safe.
When to Choose Kotlin
Kotlin is the natural choice for Android, and a useful one beyond it.
-
Businesses building for Android
A new native Android app
You want the best fit with the platform and its newest features.
- Android-first design
- Access to device features
- Release through Google Play
-
Teams with an old Java app
A codebase that is costly to change
Boilerplate and null errors slow the team, and you want a safer language.
- Convert in stages
- Java and Kotlin side by side
- Tests added before big moves
-
Companies targeting several platforms
Shared logic without a shared interface
You want native screens on each platform but one source of truth for the rules.
- Shared networking and models
- Native look on each platform
- Less duplicated testing
Kotlin or Java for Android?
Both run on the same Android platform and can live in one project. Kotlin is the newer and now preferred option, while Java remains common in older apps.
Kotlin is usually the better choice when
- You are starting a new Android app
- You want built-in protection against null errors
- Your team wants less repetitive code
- You plan to use Jetpack Compose
| Consideration | Kotlin | Java |
|---|---|---|
| Amount of code | Concise, less boilerplate | More verbose |
| Null safety | Built into the type system | Relies on convention and checks |
| New Android features | Often Kotlin first | Supported, but examples lean to Kotlin |
| Existing library and developer base | Large and growing | Very large and long established |
| Asynchronous code | Coroutines read like normal code | Callbacks or other libraries |
| Best for | New Android work and modern codebases | Maintaining large older codebases |
How We Deliver Your Kotlin App
Every project moves from a written scope to agreed review points, so you always know what is happening and what comes next.
Choose Libraries and Architecture
We agree the app structure, Compose or views, and the libraries for networking, storage and dependency handling.
Architecture decidedBuild the Core Flows
Navigation, data layer and key screens are built in sprints, with a demo on a real device.
Working app skeletonAdd Features and Integrations
Remaining features, push messages and back-end connections are added and tested on several devices.
Feature complete buildTest and Prepare
We run tests on a spread of Android versions and screen sizes, then prepare the store listing materials.
Release candidateRelease and Hand Over
The app is released through Google Play, and the source, build setup and documentation are handed over.
Live app and documentation
What Affects the Cost of Kotlin App Development
Kotlin and its tooling are free to use, so cost comes from the scope and the team. These are the factors we confirm in discovery.
Screens and features
Each screen, flow and device feature adds design, build and test work.
Device and version range
Supporting many Android versions and screen sizes needs more testing.
Conversion from Java
Converting an existing codebase depends on its size, tests and structure.
Shared code
Kotlin Multiplatform adds set-up work but can reduce duplicated effort later.
Back-end integration
An API that is ready costs less than one that must be built alongside the app.
Release requirements
Store listings, review rules and update planning add work.
Why Build With Kotlin and NetOfficials
The working terms below are part of every engagement, not extras.
One Cross-Functional Team
Design, development, testing and DevOps run through a single team, so decisions stay connected.
Senior From Day One
The senior engineer who scopes your work stays involved while it is delivered.
You Own Everything
IP assignment is confirmed in the contract, and you receive the full source code and documentation at handover.
Mutual NDA
We sign a mutual NDA before you share the details of your project.
Your Working Hours
We agree a communication window that suits your time zone at the start.
Visible Progress
Work is tracked in Jira, with a demo and your feedback at the end of every sprint.
Tools Around Kotlin
We recommend technology for your project and your team's future, not for our convenience. Three questions guide every choice.
Will it handle your load?
We size the design for your expected users, data and growth, so it does not need rebuilding when the business grows.
Will it fit your systems?
We check how the stack connects with the tools, databases and partners you already rely on before we commit to it.
Can you support it later?
We favour well-supported technology with a wide talent pool, so your own team or any future partner can maintain it.
Technologies we work with
Kotlin
Flutter
React Native
Swift
Java
Node.js
GraphQL
AWS
Azure
Google Cloud
Docker
TerraformFlexible Ways to Work With Us
Pick the model that fits where your project is today. You can move between them as it grows.
Project Delivery
We deliver an agreed scope, timeline and price.
- Written discovery scope
- Milestone reviews
- Best for a clear first release
- For ongoing work
Dedicated Team
A team that works only on your project, led by a named delivery lead.
- Cross-functional team
- Sprint demos and planning in Jira
- Scale the team up or down
Team Extension
Specialists who join your existing team, tools and processes.
- Works in your process and tools
- Agreed overlap hours
- Best for adding a missing skill
Related Technologies and Services
Technology choices connect to services and hiring. These pages cover what people usually read next.
Kotlin App Development FAQs
What is Kotlin used for?
Kotlin is mainly used to build Android apps. It also runs on servers and can share code between platforms through Kotlin Multiplatform.
Is Kotlin better than Java for Android?
For new apps, Kotlin is generally the better choice, because it is more concise and safer with null values. Java code still works and can sit beside Kotlin.
Can you convert our Java app to Kotlin?
Yes. We usually convert in stages, starting with the code that changes most, and test as we go so the app keeps working.
Can Kotlin be used for iOS apps?
Kotlin Multiplatform can share business logic with an iOS app, but the iOS interface is usually written in Swift. We discuss whether sharing helps your case.
Do you use Jetpack Compose?
It is our usual recommendation for new interfaces. For an older app we may keep existing views and add Compose gradually.
Who owns the app source code?
You do. The contract confirms ownership before the build begins, and you receive the source, build configuration and documentation.
Ready to Build Your Kotlin App?
Share a few details. A senior engineer reads every brief and replies with questions and a suggested next step.
- We review your briefAnd reply with questions
- We sign a mutual NDABefore you share the details
- You get a written scopeTeam, timeline and model, before any commitment