Kotlin Developer

4.5173 hours53K learnersCertificate
Learn Kotlin for backend, frontend, and Android app development to expand your reach across multiple platforms with a concise language developed by JetBrains.
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Study at your own pace
Fit learning around your schedule. Suitable for all levels.
Learn from the experts
Short, practical text lessons by seasoned developers.
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Integrated with professional tools by JetBrains.
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What you'll learn

Here, you will upgrade your functional programming expertise alongside testing, debugging, and data-organizing skills. Working on challenging projects, you will gain competence with smart algorithms, handy libraries, and advanced development tools. What you will do:

  • simplify your application design with functional programming;
  • master key programming concepts, such as binary numbers;
  • get familiar with helpful tools like Java and Kotlin libraries;
  • learn how to efficiently organize your data;
  • get experience with different data formats, such as JSON, CSV, etc.
  • practice making your code clear and concise even in most complex tasks;
  • learn how to find bugs in your code;
  • implement some popular algorithms;
  • work with professional development tools (IDE);
  • understand how AI tools can support problem-solving and coding tasks and use them to explore solutions, review code, and improve productivity;
  • handle multiple tasks quickly and efficiently.

Show your commitment to the Kotlin cause, select the course, and have a nice Kotlin!

Course program

View all 53 sections

This course includes:

1620+
Choice problems
1210+
Coding problems
406
Theoretical articles
36
Projects to choose from
Certificate of completion
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Learn by doing

# 1
Apply knowledge into practice
You already know the theory. Now it's time to code like you do at work—in a professional IDE, with real project constraints, solving problems that actually matter. Welcome to software engineering as it should be.
# 2
Navigate complexity with surgical precision
Most developers waste months learning random concepts without seeing how they connect. Our interactive Knowledge Map fixes this. It shows exactly how every programming concept relates to others, helping you build a structured mental model of coding.
# 3
Copy the best. Then improve.
Here's what top engineers do that others don't: they study other people's code obsessively. When you get stuck on Hyperskill, you can explore solutions published by other developers. See their exact code. Understand their approach. Learn their tricks.
# 4
Code review that actually makes you better
We stripped code review down to what actually matters: does your solution work? Have you handled the edge cases? Is there a cleaner way to write this? Hyperskill acts like a competent reviewer who actually tests your code. Not genius-level analysis, not architecture debates — just solid feedback on making your code better.

Elevate your engineering mastery through real-world challenges

Master advanced engineering concepts through ambitious projects. Each project deepens your expertise and transforms you from an experienced engineer into an exceptional one.

Minesweeper (Kotlin)

They say a minesweeper makes only two mistakes in their life: the first is their choice of occupation, and the second one is fatal. In this project, you will create your own, safe "Minesweeper" – a game that will be a brain teaser for both you and your players.

Phone Book (Kotlin)

You suddenly remember you need to call your aunt and wish her a happy birthday, but how do you find her number quickly in a giant phonebook? Write a program that will solve this problem once and for all. Create a phonebook that allows you to find the information you need quickly and easily. Names and numbers, here we come.

Graduate

Maze Runner (Kotlin)

Mazes are amazing: keep running, find the exit if you can! If you are not too happy about getting stuck in the actual maze, you can entertain yourself with a virtual one. In this project, you will write a program that generates mazes and looks for a way out.

Explore all projects

Learn from the industry experts

JetBrains Academy

JetBrains Academy

JetBrains Academy is a part of JetBrains, a global software company specializing in the creation of intelligent, productivity-enhancing tools for software developers and teams. With years of expertise in software development and education, JetBrains Academy empowers more than a million people worldwide to learn and teach computer science, and help organizations inspire their teams to reach their goals in tech. Professional development tools play a big role in computer science education. This is why JetBrains Academy courses offer integration with JetBrains IDEs. This integration assists learners in getting experience with real development processes to streamline their learning curve at future work.

Your peers think Hyperskill rocks

Geovanny Mendoza avatar
Geovanny Mendoza
3 weeks ago
Curso muy completo para quien viene de backend con Java y quiere profundizar en Kotlin, cubre desde fundamentos del lenguaje hasta temas avanzados como corrutinas, coroutines exception handling, Flow/StateFlow, Channels, Kotlin Multiplatform, reflection e interop con Java. Lo mejor: mucho ejercicio ...
Charles Perry avatar
Charles Perry
6 months ago
Learn most of everything I know about Kotlin. I also learned what seam cutting is as well as how to implement it.
René Berndt
8 months ago
A really good course! I had to switch from PHP to Kotlin for work (using a hybrid functional approach) because my company was bought out by a competitor. I really enjoyed the course, and it helped me develop my skills.

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Course provided by JetBrains Academy
John Callbackhas successfully completed the courseKotlin Developer
Issue date September 2, 2026
406 topics completed

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