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Meet our Kotlin Developer community

Braintrust is a user-owned talent platform created by and for the world’s top talent. This includes a talented network of experienced Kotlin Developer available for hire.

Looking for Work

Allen Ahner

Allen Ahner

Software Engineer
Allendale Charter Township, MI, USA
  • Kotlin
  • Ruby

Looking for Work

Iaroslav Titov

Iaroslav Titov

Software Engineer
Alexandria, VA, USA
  • Kotlin
  • C#

Looking for Work

Breno Batista Machado

Breno Batista Machado

Sr. Software Developer
Vancouver, Canada
  • Kotlin
  • Java
  • C#

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How to hire Top Kotlin Developer


Hiring a Kotlin developer for app development involves careful consideration of various factors, both technical and non-technical. Technical competencies, such as a thorough understanding of the Kotlin language, familiarity with the Java Virtual Machine (JVM), and proficiency in relevant frameworks and libraries, are paramount. Other critical technical skills include knowledge of Android mobile app development, proficiency in unit testing and debugging, understanding of software development principles, familiarity with ios, familiarity with version control systems, and more.

On the non-technical side, soft skills are crucial. Good communication, problem-solving abilities, a willingness to learn, and the capacity to work well in a team all contribute to the overall success of a project.

The nature of your organization, whether it's a startup or a larger company with a development team, can significantly influence the hiring process. In a startup environment, a Kotlin developer might need to wear multiple hats and be comfortable working in a fast-paced, often changing environment. They may need to be more self-directed, adaptable, and willing to take on tasks outside of their core job description. Conversely, in a larger company, roles can be more clearly defined and processes more established. A Kotlin developer in such a setting would benefit from being detail-oriented and having the ability to work within specific frameworks and protocols.

The decision to hire Kotlin developers full-time versus an hourly contractor depends on your project's scope and timeline. Full-time developers can be ideal for long-term projects where continuity and deeper engagement with the product are valuable, or when in-house collaboration is critical. They’re often more immersed in the company culture and are typically available during regular business hours, which can aid in collaboration. The developers’ time zone is another factor worth considering. On the other hand, hourly contractors can be a good fit for short-term projects or specific tasks that require specialist knowledge. They offer flexibility and can often be brought on board more quickly than full-time employees. You can often work with someone with years of experience at a much lower total cost to meet your business needs.

Lastly, remember that cultural fit, passion for the role, and alignment with your company's values are crucial when making a hiring decision. The best Kotlin developers are those who are not only technically proficient but also align with the vision and objectives of your company. In the ever-evolving world of technology, an eagerness to stay updated and continually improve one's skills is another hallmark of a great developer.

Proficiency in Kotlin

Kotlin is a statically typed programming language that runs on the JVM, and it is fully interoperable with Java. A proficient Kotlin developer should have a solid understanding of its syntax and core libraries. They should be skilled in using its unique features like null safety, which reduces the risk of null pointer exceptions, and extension functions that allow adding methods to classes without modifying their source code. They should understand and use constructs like coroutines for handling multi-threading tasks. In terms of tools, IntelliJ IDEA is the preferred integrated development environment (IDE) for Kotlin development due to its excellent support for the language. A candidate should have a track record of projects or contributions that demonstrate their Kotlin expertise, and ideally, they should be able to demonstrate their ability to write clean, maintainable, and efficient Kotlin code.

Understanding of JVM

Kotlin is JVM-based, which means it's crucial for a Kotlin developer to understand the workings of the JVM. This includes understanding how the JVM handles memory management, just-in-time compilation, and garbage collection. A strong grasp of concurrency in the JVM is also crucial, as Kotlin's coroutines are built on top of JVM's native threads. The developer should be proficient in using tools like VisualVM or Java Mission Control to monitor application performance and diagnose issues. Furthermore, understanding the JVM ecosystem is important for handling dependencies and using tools like Gradle for build automation.

Experience with Frameworks and Libraries

Kotlin can be used with a variety of libraries and frameworks to speed up development and make code more maintainable. If you're developing a web application, having knowledge of Ktor, a Kotlin-native framework, or Spring Boot, which has first-class support for Kotlin, is important. For Android development, knowing Jetpack libraries that simplify common Android tasks is crucial. A good Kotlin developer should also be adept at using libraries that aid in writing concise and functional code, such as Arrow for functional programming, or kotlinx.coroutines for handling concurrency.

Android Development Knowledge

If the role involves Android development, the developer should be familiar with the Android Software Development Kit (SDK) and how to use Kotlin features effectively within the Android ecosystem. They should understand Android-specific concepts such as handling lifecycle events, creating user interfaces with XML or Jetpack Compose, data persistence with Room, and network requests with Retrofit. Furthermore, they should know how to use Android Studio, Google's official IDE for Android development. Proficiency in using Android's profiling tools to optimize app performance and experience with the Android app publishing process are also valuable skills.

Unit Testing and Debugging Skills

The ability to write testable code and conduct thorough testing is a must-have skill for any Kotlin developer. This includes proficiency in unit testing, integration testing, and end-to-end testing. A good Kotlin developer should be able to write test cases using frameworks such as JUnit, Mockito, or Espresso for Android UI testing. Kotlin also has a multiplatform testing tool known as 'kotlin.test' that allows writing tests that can run on any platform Kotlin supports. In addition to writing tests, they should be proficient in debugging code using IDEs like IntelliJ IDEA or Android Studio. Understanding how to read stack traces, use breakpoints, and inspect variables during execution are all crucial debugging skills. Additionally, knowledge of Continuous Integration (CI) tools such as Jenkins or CircleCI for automated testing would be beneficial.

Knowledge of Software Development Principles

A proficient Kotlin developer should understand and implement solid software development principles. Familiarity with object-oriented programming (OOP) principles like encapsulation, inheritance, and polymorphism is critical, as is an understanding of functional programming concepts like higher-order functions and immutability, both of which are well-supported in Kotlin. Understanding architectural patterns such as Model-View-Controller (MVC), Model-View-ViewModel (MVVM), or Model-View-Intent (MVI) for structuring code is important, especially in the context of Android development. Further, they should have knowledge of software development methodologies like Agile or Scrum, which involve iterative development, continuous feedback, and flexibility to change.

Version Control Systems

Effective use of a version control system is vital for any developer. It allows them to track changes, collaborate with other developers, and revert to previous versions if a problem arises. Git is the most widely used system, and understanding it is crucial for any Kotlin developer. They should be familiar with common operations such as committing changes, creating branches, merging changes, and resolving conflicts. Experience with a platform like GitHub, Bitbucket, or GitLab for repository management and code review is also a valuable skill. It's equally important for the developer to understand concepts like branching strategies, pull requests, and CI/CD integration with these platforms.

Soft Skills

Beyond technical proficiency, certain soft skills can make a Kotlin developer more effective in their role. Good communication skills are crucial for understanding requirements, explaining technical concepts, and collaborating effectively with team members. Problem-solving skills are also essential, as developers often need to find creative solutions to complex technical challenges. A passion for learning is important given the fast-paced nature of software development, as is the ability to accept feedback and continuously improve. Lastly, team players who can effectively collaborate with others and understand the bigger picture beyond their individual tasks will be more likely to contribute positively to a project's success.

Frequently Asked Questions

How much does it cost to hire a Kotlin Developer?

The cost of hiring a Kotlin developer can vary significantly based on several factors, such as the developer's experience level, the complexity of the development project, the length of the engagement, and the location. In the US, the annual salary price tag for a Kotlin developer can range from $70,000 for entry-level developers to over $130,000 for senior developers. Besides the salary, there might be additional costs for benefits, office space, and other overheads if you're hiring a full-time employee.

Where can I hire a Kotlin Developer?

There are numerous platforms where you can hire a Kotlin developer. These include general job listing sites such as Indeed, LinkedIn, and Glassdoor. You could also look on platforms specifically tailored to tech and software development roles. Freelance marketplaces like Braintrust offer opportunities to find contract-based Kotlin developers. Additionally, local networking events, meetups, or tech conferences can also be a good way to connect with potential candidates.

How do I recruit a Kotlin Developer?

Recruiting a Kotlin developer involves a few steps. First, you need to clearly define the role and responsibilities, the skills and experience required, including project management expertise, and the project's specifics. Once the job description is ready, post it on relevant job boards, websites, and social media platforms. You can also reach out to a recruitment agency specializing in tech hiring. Once applications start coming in, screen them based on their resume, portfolio, and past experience. The interview process should assess both technical and soft skills. It's a good practice to include a coding test or a review of their previous code to evaluate their Kotlin proficiency.

How much does a Kotlin Developer charge per hour?

The hourly rate for a Kotlin developer can vary widely depending on their experience, skill level, and geographical location. Kotlin programmers like other software engineers in the US might charge anywhere from $30 to over $100 per hour. Developers in other regions or countries may have different rates. For instance, in Eastern Europe or Asia, rates could be lower due to differences in cost of living. It's important to consider these factors, as well as the complexity of your development process and the scope of your project when negotiating an hourly rate.

Is Kotlin for frontend or backend?

Kotlin is a versatile programming language that can be used for both frontend and backend development. In the context of mobile application development, Kotlin is often used for frontend development, specifically android applications and Android app development, where it is now Google's preferred language. It enables developers to create interfaces and client-side functionalities. On the backend, Kotlin can be used to develop server-side applications, thanks to its compatibility with Java libraries and frameworks such as Spring Boot, and Kotlin-specific frameworks like Ktor. The advent of Kotlin/JS also makes it possible to use Kotlin for web-frontend development.

What language is Kotlin?

Kotlin is a statically-typed, cross-platform programming language developed by JetBrains. It is designed to interoperate fully with Java, and it runs on the Java Virtual Machine (JVM). Its syntax is more concise and expressive than Java's, which can help reduce the amount of boilerplate code. One of Kotlin’s key design goals is to improve upon some of Java's shortcomings, such as null pointer safety. Since its introduction, Kotlin has gained popularity and has been adopted by many companies for its readability, simplicity, and compatibility with Java.

Is Kotlin better than Java?

Determining whether Kotlin is "better" than Java is subjective and depends on the specific context. Kotlin offers several improvements over Java, including null safety, lambda expressions and extension functions, and it generally involves writing less boilerplate code. Kotlin’s syntax is more concise, which can make code easier to read and write. However, Java has been around for a long time and has a larger ecosystem, with more libraries, tools, and resources available. There are also more developers who know Java, which can be a consideration for team compatibility and hiring. Both languages have their merits, and the choice between them often comes down to the specific needs of the project and the preferences of the team.

Is Kotlin and Java the same?

While Kotlin and Java are not the same, they are designed to be fully interoperable. This means that they can work together seamlessly in the same project. Kotlin is a more modern language and introduces several features that Java does not have, such as null safety, extension functions, and coroutines for simplified concurrent programming. However, it also retains a similar syntax and design philosophy to Java, which makes it easier for Java developers to learn. One of the key strengths of Kotlin is its ability to leverage existing Java libraries and frameworks, thereby allowing developers to benefit from the mature Java ecosystem while also using a more modern and expressive language.

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