Kotlin Core

4.5133 hours92K learnersCertificate
Kotlin, developed by JetBrains, is Google's preferred language for Android app development. Master the language under the guidance of its original creators.
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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

In this course, you’ll get familiarized with the language syntax, concepts, and libraries, as well as with the basics of OOP. Working on real-life projects, you’ll learn to appreciate the simplicity, clarity, and beauty of Kotlin code.
What you will do:

  • learn the Kotlin syntax and work with a variety of its features;
  • simplify your application design with functional decomposition;
  • master key programming concepts;
  • clarify your code with OOP decomposition;
  • get familiar with helpful tools like Java and Kotlin libraries;
  • learn how to deal with bugs in your programs;
  • work with professional development tools, IDEs;
  • get text processing experience;
  • learn how to work with the file system.

Ready to get your feet wet? Select the course and start your journey!

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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.

Parking Lot

Cities are becoming smarter to meet our needs, and parking spaces are an essential part of urban design. As a developer, you can help improve them. In this project, you will create a parking lot management program that keeps track of vacant spots and parked cars.

Graduate

Tasklist

It's always good to have something that can remind you about important tasks. It may be simple paper notes or a sophisticated app. In this project, you will create a text-based program that shows tasks, deadlines, and priorities.

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Topics covered by this course

Types and data structures
64 topics
Fundamentals
57 topics
Object-oriented programming
43 topics
Control flow
40 topics
Additional instruments
34 topics
Basics
12 topics
Algorithms and Data Structures
12 topics
Concurrency and parallelism
8 topics
Advanced features
5 topics
Math
2 topics
System administration and DevOps
2 topics

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

Yunus Emre Gamsız
4 weeks ago
Great for building a practical foundation in Kotlin, but be prepared for a slow start and strict project requirements.
Jean-Pierre Gonçalves
2 months ago
In this course I learned the basics of Kotlin language. This course alternates theory and practice with exercises, as well as very interesting projects to carry out.
Oleg Kabakov avatar
Oleg Kabakov
6 months ago
This is the first course I've completed on Hyperskill, and I'm really glad that I've discovered this resource. It wasn't always easy, but many topics were explained very well, and the learning system worked great. Thank you, JetBrains team, for this opportunity!

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Course provided by JetBrains Academy
Anonymous 154248806has successfully completed the courseKotlin Core
Issue date November 28, 2025
279 topics completed

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