Technology Comparison

Kotlin vs Java - Which Should You Use?

Comparing Kotlin and Java for your next project. Honest analysis of performance, ecosystem, and suitability for Australian businesses.

2 weeks

Prototype Delivery

50+

Businesses Served

under 2 seconds

Average Load Time

Book Free Assessment Build Your Stack

Our Development Capabilities

Custom-built solutions for your specific business needs.

Performance Engineering

Server-side rendering, code splitting, and caching strategies that deliver sub-second load times at scale.

CI/CD and DevOps

Automated testing, continuous integration, and deployment pipelines that keep your application reliable and easy to update.

Progressive Web Apps

Web applications that feel native on mobile devices. Offline support, push notifications, and app-like performance.

Custom Web Applications

Bespoke web applications built from the ground up to solve your specific business problems. No off-the-shelf compromises.

Quick Comparison

Side-by-side comparison to help you decide.

Criterion	Kotlin	Java
Null safety	Null safety built into the type system - nullable types explicit	Null is valid for any reference type; NullPointerException is the most common Java bug
Syntax conciseness	Data classes, extension functions, lambdas - significantly less boilerplate	Verbose - getter/setter, constructor boilerplate standard without Lombok
Coroutines	First-class coroutines - structured concurrency without callback hell	Virtual threads (Project Loom, Java 21) - excellent async without coroutine syntax
Spring Boot compatibility	Full compatibility; Spring provides Kotlin extensions and DSL	Native - Spring was built for Java; most docs and examples are Java
Android development	Google-preferred language for Android since 2019	Still supported but Kotlin is the recommended path for new Android projects
Hiring in Australia	Growing - most Java shops are adopting Kotlin; Android market is Kotlin-first	Larger existing pool; Java remains dominant in banking, government, and large enterprises

Our Verdict

Choose Kotlin for new JVM projects, Android development, and Spring Boot backends where the team wants null safety and reduced boilerplate. The interoperability with Java is excellent - you can call Java libraries from Kotlin and migrate incrementally. Choose Java when the team is Java-proficient and has no appetite for a new language, when you are on Java 21+ with virtual threads (Project Loom makes async Java competitive with Kotlin coroutines), or when senior Kotlin expertise is difficult to source in your market. For Android development, Kotlin is the clear choice - it is Google's recommended language and most Android tooling is Kotlin-first.

Choose Kotlin when:

✓ Android application development - Kotlin is Google's preferred language
✓ New Spring Boot backend where null safety and coroutines are valued
✓ Team is migrating from Java and wants to adopt Kotlin incrementally
✓ Reducing boilerplate is a priority - data classes, extension functions reduce LOC significantly

Choose Java when:

✓ Java 21+ project using Project Loom virtual threads for structured concurrency
✓ Large existing Java codebase where language migration is not justified
✓ Hiring context where Kotlin expertise is scarce and Java is the team standard
✓ Large organisation or government context where Java is the mandated language

Frequently Asked Questions

Pricing depends on what you need - a simple web app costs less than a complex system with multiple integrations. We provide fixed-price proposals after a free discovery session.

Our core stack is Next.js, React, and TypeScript, but we select technology based on your project needs. We have experience with Python, Node.js, PostgreSQL, and all major cloud platforms.

Yes, our team has experience with both Kotlin and Java. We choose the right tool based on your project needs and recommend accordingly during our free assessment.

It depends on your project requirements. Kotlin and Java each have strengths. Our detailed comparison above covers the trade-offs to help you decide.

We specialise in integration. Whether it is your CRM, accounting software, or industry-specific tools, we connect your new application to your existing systems.

Yes. Every project includes 3 months of post-launch support covering bug fixes, performance tuning, and minor feature additions. We also offer ongoing retainer plans.

Timelines depend on scope, but most projects go from kickoff to launch in 4-8 weeks. A working prototype is ready within the first 2 weeks for early feedback.