Kotlin: Build powerful and efficient applications
Kotlin is a modern, statically typed programming language that targets the Java Virtual Machine (JVM), Android, JavaScript, and native platforms. Known for its conciseness, safety, and interoperability with Java, Kotlin is an excellent choice for developing a wide range of applications, from mobile apps and server-side systems to web frontends and data science tools.
What to look for in Kotlin freelancers
When hiring a Kotlin freelancer, consider their experience with:
- Kotlin coroutines for asynchronous programming
- Kotlin multiplatform projects for code sharing across platforms
- Relevant frameworks like Ktor, Spring Boot, or Compose
- Testing frameworks like JUnit and Mockito
- Version control systems like Git
A strong portfolio showcasing completed projects is essential. Look for clean, well-documented code and evidence of best practices.
Main expertise areas
Android development
Kotlin is the preferred language for Android development. Freelancers specialising in this area should be proficient in building user interfaces, handling data persistence, integrating with APIs, and optimising app performance.
Backend development
Kotlin's JVM compatibility makes it a powerful choice for backend development. Look for experience with server-side frameworks like Spring Boot, Ktor, and exposure to database technologies.
Multiplatform development
Kotlin Multiplatform allows developers to share code between different platforms, reducing development time and costs. Freelancers with this expertise can help you build applications that run seamlessly on Android, iOS, web, and desktop.
Relevant interview questions
- Describe your experience with Kotlin coroutines and how they improve asynchronous programming.
- Explain your approach to testing Kotlin code. What frameworks do you prefer?
- Have you worked with Kotlin Multiplatform? Describe a project where you used it.
- What are your preferred Kotlin libraries and frameworks, and why?
- How do you stay up-to-date with the latest advancements in Kotlin?
Tips for shortlisting candidates
- Review portfolios carefully, paying attention to code quality and project complexity.
- Check for contributions to open-source projects and active engagement in the Kotlin community.
- A good communicator is crucial, so assess their ability to articulate technical concepts clearly.
Potential red flags
- Lack of a portfolio or demonstrable Kotlin experience.
- Inability to explain core Kotlin concepts.
- Poor communication skills.
- Unwillingness to adapt to different project requirements.
Typical complementary skills
Kotlin freelancers often possess expertise in related areas such as:
- Java
- Android SDK
- iOS development (for multiplatform projects)
- JavaScript (for web development)
- SQL and NoSQL databases
What problems a Kotlin freelancer can solve for you
Hiring a skilled Kotlin freelancer can help you:
- Develop high-performance, cross-platform applications.
- Reduce development time and costs through code sharing and efficient language features.
- Improve the maintainability and scalability of your software.
- Gain access to a wider pool of talent.
- Focus on your core business while experts handle your development needs.
For example, a Kotlin freelancer could help you build a robust mobile app for both Android and iOS using Kotlin Multiplatform, or develop a scalable backend system using Ktor and Spring Boot. They could also modernise your existing Java codebase by migrating it to Kotlin, improving its readability and maintainability.
Another example could be developing a desktop application using Kotlin/JVM and Compose for Desktop, allowing you to leverage your existing Kotlin expertise for desktop development.
Or, perhaps you need a performant and scalable web application; a Kotlin freelancer with Ktor experience could build a robust solution tailored to your specific needs.
