Finding the best Kotlin development firms a priority? Top Kotlin development companies offering international services to their clients are listed below. Firms of various sizes regularly use the top Kotlin development companies shown on Software Outsourcing Journal. You may filter your search results by quality of portfolio, price of services, number of pleased clients, reputation in the field, and more.
Kotlin has become the language of choice for modern Android development and a rising star for backend and cross-platform projects. Google has recommended Kotlin as the preferred language for Android apps since 2019, and companies such as Pinterest, Netflix, and Uber use it in their products. Its concise syntax, built-in safety features, and full compatibility with Java help teams ship reliable software faster.
As demand for skilled Kotlin engineers grows, many businesses partner with the top Kotlin development companies to build, scale, and maintain their applications. In this guide, Software Outsourcing Journal explains what Kotlin development companies do, the core services they offer, common use cases, typical costs, and how to choose the right partner.
What Does a Kotlin Development Company Do?
Kotlin is an open-source, statically typed programming language developed by JetBrains, with version 1.0 released in 2016. It runs on the Java Virtual Machine (JVM), works seamlessly with existing Java code, and adds modern features such as null safety, coroutines for asynchronous programming, and concise syntax. With Kotlin Multiplatform, it can also share code across Android, iOS, web, and desktop. A Kotlin development company uses this language and its ecosystem to build software for its clients.
Build Android and cross-platform mobile apps
Most Kotlin development companies specialize in mobile apps. They build native Android applications with Jetpack Compose and modern Android architecture, and increasingly use Kotlin Multiplatform to share business logic between Android and iOS while keeping a native user experience on each platform.
Develop backends and connect business systems
Kotlin is also a strong choice for server-side development. Teams build APIs and backend services with frameworks like Spring Boot and Ktor, and integrate apps with databases, payment gateways, CRMs, ERPs, cloud services, and authentication providers. Using Kotlin on both mobile and backend helps teams share knowledge and code.
Manage releases, scaling, and maintenance
Experienced Kotlin teams handle app store releases, CI/CD pipelines, crash monitoring, and analytics. For backends, they containerize services and deploy them to cloud platforms. They also keep apps compatible with new Android versions, update libraries, fix security issues, and add features as your product evolves.
Key Kotlin Development Services
The top Kotlin development companies cover the full software lifecycle. These are the core services to look for.
Native Android App Development
Native Android development is the core service of most Kotlin companies. Teams design and build apps with Jetpack Compose, follow recommended architectures such as MVVM, and use libraries like Room, Hilt, and Retrofit. The result is a fast, stable app that follows Google’s best practices and delivers a smooth experience across thousands of Android devices.
Kotlin Multiplatform Development
Kotlin Multiplatform (KMP) lets teams write shared code for networking, data, and business logic once, then use it on Android, iOS, desktop, and web. Compose Multiplatform can also share UI code. Kotlin companies use KMP to reduce duplicated work and keep features consistent across platforms, without giving up native performance.
Kotlin Backend and API Development
Kotlin’s concise syntax and coroutines make it excellent for backend services. Developers build REST and GraphQL APIs, microservices, and real-time systems with Spring Boot, Ktor, or Micronaut. Because Kotlin runs on the JVM, it can use the entire Java ecosystem of libraries and tools.
Java-to-Kotlin Migration and Maintenance
Many companies run large Android apps or backend systems written in Java. Kotlin companies migrate these codebases step by step, since Kotlin and Java can live side by side in the same project. They also maintain existing apps, update them for new Android releases, improve performance, and reduce crashes and technical debt.
Kotlin Development Use Cases
Kotlin is versatile enough for mobile, backend, and cross-platform projects. Here are the use cases where it delivers the most value.
Consumer mobile apps
Social, entertainment, travel, food delivery, and fitness apps rely on Kotlin to deliver smooth, modern Android experiences. Jetpack Compose makes it faster to build polished interfaces with animations, while Kotlin’s safety features help reduce crashes that hurt app store ratings.
Fintech and banking apps
Banks, payment providers, and fintech startups use Kotlin for secure mobile banking, digital wallets, and investment apps. Kotlin Multiplatform helps them keep complex business rules identical on Android and iOS, which is critical for accuracy and compliance.
Enterprise and field service apps
Companies in logistics, healthcare, retail, and manufacturing build internal apps for inventory, delivery tracking, field inspections, and point of sale. Kotlin supports offline-first designs, device integrations like barcode scanners, and secure connections to enterprise systems.
Backend services and APIs
Kotlin powers backend services for mobile apps, SaaS platforms, and enterprise systems. Teams already invested in the JVM often choose Kotlin for new services because it is more concise than Java while remaining fully compatible with existing Java code and infrastructure.
How We Evaluate Top Kotlin Development Companies
At Software Outsourcing Journal, we assess Kotlin development companies using four core criteria. You can apply the same framework when reviewing vendors yourself.
| Criteria | What we look for |
|---|---|
| Relevant projects and client references | Published Android apps or live Kotlin services, case studies with measurable results, and verifiable client reviews. |
| Android, Multiplatform, and backend expertise | Strong Jetpack Compose skills, Kotlin Multiplatform experience, and backend work with Spring Boot or Ktor. |
| Code quality, security, and app performance | Automated testing, secure data handling, low crash rates, and strong app store ratings. |
| Pricing transparency and ongoing support | Clear estimates by phase and role, realistic timelines, and defined maintenance plans and SLAs. |
Relevant projects and client references
We prioritize companies with apps you can download and services running in production. Strong candidates share detailed case studies, such as improved app ratings, reduced crash rates, faster release cycles, or successful Java-to-Kotlin migrations, and provide client references we can verify on independent review platforms.
Android, Multiplatform, and backend expertise
We look for engineers who know modern Kotlin deeply, including coroutines, Flow, and Jetpack Compose, along with Android architecture components and dependency injection. Experience with Kotlin Multiplatform and server-side frameworks like Spring Boot or Ktor shows a team can support your product beyond a single platform.
Code quality, security, and app performance
We check whether vendors write unit and UI tests, use static analysis tools like Detekt and ktlint, and run regular code reviews. Security practices such as encrypted storage, secure API communication, and protection against reverse engineering matter, as do measurable results like startup time, crash-free sessions, and battery efficiency.
Pricing transparency and ongoing support
The best partners explain costs clearly before work begins and avoid hidden fees. They also offer reliable post-launch support, including bug fixes, Android version updates, library upgrades, security patches, and new feature development.
How Much Does Kotlin Development Cost?
Kotlin development typically costs from around $20,000 for a simple Android app or MVP to $300,000 or more for a complex, multi-platform enterprise solution. The final price depends on features, platforms, integrations, and team location. The figures below are approximate market ranges, so always confirm with detailed vendor quotes.
Pricing models and project scope
Most Kotlin development companies offer three engagement models:
- Fixed price: best for clearly defined projects, such as an MVP app with a set feature list.
- Time and materials: you pay for actual hours worked, ideal when requirements evolve during development.
- Dedicated team: a monthly fee for full-time Kotlin developers who work as an extension of your team.
| Project scope | Typical timeline | Approximate cost (USD) |
|---|---|---|
| Simple Android app or MVP | 2–4 months | $20,000–$60,000 |
| Feature-rich app with backend or Kotlin Multiplatform | 4–8 months | $60,000–$150,000 |
| Enterprise mobile and backend platform or large migration | 8–12+ months | $150,000–$300,000+ |
Hourly rates for Kotlin developers vary by region. As a rough guide, expect about $25–$50 per hour in South and Southeast Asia, $40–$80 in Eastern Europe and Latin America, and $100–$180 in North America and Western Europe.
Key cost drivers
- Feature complexity: real-time features, offline sync, maps, payments, and video require more development time.
- Number of platforms: adding iOS through Kotlin Multiplatform, or a web and desktop version, increases scope.
- Design requirements: custom UI, animations, and branded design systems cost more than standard components.
- Backend scope: apps that need custom APIs, databases, and admin panels cost more than front-end-only apps.
- Device and hardware integrations: Bluetooth, NFC, cameras, and wearables add development and testing work.
- Security and compliance: fintech and healthcare apps need extra security, audits, and documentation.
Hosting, infrastructure, and maintenance costs
Development is only part of the total budget. Kotlin applications also incur ongoing costs:
- App store fees: Google Play charges a one-time $25 developer registration fee, and Apple charges $99 per year if you also publish on iOS.
- Backend hosting: cloud servers, databases, storage, and push notification services can range from under $100 to several thousand dollars per month.
- Third-party services: analytics, crash reporting, maps, payments, and authentication providers may charge usage fees.
- Maintenance: plan roughly 15–20% of the initial build cost per year for Android version updates, bug fixes, library upgrades, and support.
Google Play regularly raises target API level requirements, so regular updates are essential to keep your app available to users.
How to Choose a Kotlin Development Partner
The right partner can deliver a stable, high-rated app that grows with your business, while the wrong one can leave you with crashes, poor reviews, and costly rewrites. Follow these four steps.
Define requirements and success criteria
Before contacting vendors, outline your business goals, target users, platforms, core features, and required integrations. Set measurable success criteria, such as launch date, crash-free rate, app store rating, startup time, or user retention. Clear requirements make it easier to compare proposals fairly.
Validate the proposed technical team
Ask exactly who will work on your project and review their Kotlin, Jetpack Compose, and Multiplatform experience. Download apps they have built, review code samples, or hold a technical interview to confirm they follow modern Android best practices. Check the balance of senior and junior developers and whether designers and QA engineers are included.
Confirm data privacy, IP ownership, and handover
Make sure your contract states that you own all source code, designs, signing keys, and app store accounts. Confirm how the vendor handles user data and complies with privacy rules such as GDPR, and sign an NDA before sharing confidential information. A good partner provides clear documentation and knowledge transfer so your team or another vendor can take over at any time.
Start with a scoped pilot
Rather than committing to a large contract immediately, start with a small, well-defined pilot, such as a clickable prototype, a core feature, or a code audit of your existing app. A pilot of a few weeks reveals the vendor’s communication, code quality, and delivery speed before you scale up the partnership.
| Vendor checklist | Questions to ask |
|---|---|
| Kotlin experience | Which Kotlin apps or services have you delivered, and can we download or see them live? |
| Code quality | How do you handle architecture, testing, static analysis, and code reviews? |
| Security | How do you protect user data, API keys, and the app against reverse engineering? |
| Ownership | Will we own all source code, signing keys, and app store accounts? |
| Cross-platform | Do you have experience with Kotlin Multiplatform for sharing code with iOS? |
| Support | What do your maintenance plans, Android update services, and SLAs include? |
FAQs
Is Kotlin free to use?
Yes. Kotlin is open source under the Apache License 2.0 and is free to use for commercial projects. Android Studio, Jetpack libraries, Ktor, and Kotlin Multiplatform are free as well. Your main costs come from design and development work, app store fees, backend hosting, third-party services, and ongoing maintenance.
How long does Kotlin development take?
A simple Android app or MVP usually takes 2–4 months. A feature-rich app with a custom backend or Kotlin Multiplatform often takes 4–8 months, while enterprise platforms or large migrations can take 8–12 months or longer. Clear requirements and ready designs can shorten timelines significantly.
Kotlin vs. Java: which should you choose?
Both run on the JVM and work together in the same project. Kotlin offers shorter, more readable code, built-in null safety that prevents a common class of crashes, and coroutines for simpler asynchronous programming. It is also Google’s preferred language for Android, with new tools like Jetpack Compose designed for Kotlin first. Java has a longer history and a very large talent pool.
For new Android apps, Kotlin is the clear choice. For backend systems, Kotlin is a strong option, especially for teams that want modern features while keeping access to existing Java libraries. Existing Java projects can adopt Kotlin gradually without a full rewrite.
Can Kotlin integrate with existing business systems?
Yes. Kotlin apps and services connect to existing software through REST and GraphQL APIs, gRPC, webhooks, and message queues. Because Kotlin is fully interoperable with Java, it can use any Java library or SDK, including those for Salesforce, SAP, AWS, Google Cloud, Firebase, and major payment providers, so new Kotlin applications can work alongside your current systems without replacing them.
Conclusion
Kotlin has become the modern standard for Android development and a powerful option for backend and cross-platform projects. With Jetpack Compose, Kotlin Multiplatform, and full Java compatibility, it helps businesses build reliable apps faster and share code across platforms. But results depend heavily on the team behind the code.
When comparing the top Kotlin development companies, focus on real app and backend experience, Android and Multiplatform expertise, code quality, security practices, and transparent pricing. Start with a clearly scoped pilot, measure results against your goals, and scale the partnership with confidence.
Ready to find the right development partner? Explore more outsourcing guides, vendor reviews, and rankings across popular Software Development Technologies on Software Outsourcing Journal.