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UdemyKotlinPaid courseAll LevelsCertificate

Complete Kotlin development masterclass (Udemy.com)

Master the fundamentals and advanced features of Kotlin development

Created by: Catalin Stefan

Last updated February 2026

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What you will learn

  • Kotlin development
  • Kotlin coroutines
  • Functional programming
  • Object Oriented Programming
  • Kotlin language fundamentals
  • Kotlin extensions
  • Generics
  • Principles of software development

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Quality Score

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Overall Score : 96 / 100

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Course Description

This course is a unique experience on Udemy.

There are loads of Kotlin resources online to choose from, but this is the only course that takes you from a complete beginner in software development, teaches you the fundamentals, advanced topics, and makes you an expert in this field.

In addition, you have loads of practice exercises, challenges and projects to work on. I didn't just add a bunch of exercises at the end. Instead, each concept is put in code and practiced so that we make sure you apply and learn everything through action.

You get over 30 hours of on-demand videos, exercises and most importantly projects to apply the knowledge we talk about.

I've spent years building applications in Kotlin, and years again teaching people how to build code for themselves.

This is the most complete course I've ever done, and it's all to help you on your journey to become an expert developer.

We will cover basic topics such as

  • language fundamentals

  • collections

  • flow control

  • loops

  • handling errors and exceptions

  • functions

  • packages

As well as advanced topics such as

  • Object Oriented Programming

  • Principles of development

  • Standard functions

  • Types of classes

  • Extensions

  • Generics

  • Coroutines

And we will put everything in practice through examples and projects.

If you want to take ONE COURSE to master Kotlin take this course.

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Instructor Details

Catalin Stefan

I am an avid learner and teaching enthusiast. I love creating videos and courses that enrich people's lives and help them have a better experience, both personally and professionally. 

I am an expert mobile application developer with over 10 years development experience. I enjoy making courses related to AI, software development and mobile apps, and want to share the knowledge I have acquired.

I create courses based on my professional experience. I hope to teach people skills that help them in their careers, allow them to acquire new skills and improve their personal relationships.

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Reviews

4.8

3,181 ratings on Udemy

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By Andrew Thall on 4/28/2026

It's a very complete course, covering the low-level aspects of the language syntax and semantics but building toward upper-leval app development including Kotlin's concurrency mechanisms and using it for mobile development.

By Willem-Jan Boogerd on 4/23/2026

Good course in general. Very complete, clear explanations. Small comment: the literal retyping of the example already given and explained in the presentation sheets is adding much (for me). Would be nice if you could give another example or just give and explain it once.

By Louis-Gabriel BARRERE on 10/1/2025

Je trouve le cours trop long. Chaque section a un "section objectives", un "section recap" et des "practice" en plus d'exercices, je ne pense pas que tout ça soit nécessaire. C'est important d'avoir des exercises, mais c'est redondant avec les "practice". De même, on voit beaucoup de slides avec du code puis le code est réécrit à la main dans l'IDE, c'est redondant alors je zappe jusqu'aux explications. Autrement, le cours est très clair, détaillé et structuré.

By Vladimir on 5/29/2025

I bought this course to learn Kotlin from scratch and I am very pleased with the result. The course is a bit outdated, but at the same time it is as detailed and useful as possible for beginners. The teacher explains the material as clearly and in great detail as possible. Many thanks to the teacher for his hard work!

By Anastasiya Barska on 12/11/2023

Very good structured and in depth course for those who start their career with kotlin. It was too detailed for me, because I already had a kind of "learning by doing" experience and only needed to enforce some theoretical knowledge. One minor suggestion is to remove "2023" from the course title to make it more honest - as I understand, it was created in 2019-2020.

By Blazej Popowicz on 1/20/2022

This has been a very enjoyable course. The instructor takes time to explain concepts, there are many exercises which give an opportunity to practice and check your solutions. I had a very good time following the lectures. If you are a complete beginner, I'd say that up until section 36 you'll be perfectly fine. Section 36 needs an update and sections that follow introduce quite a few concepts that practically require another course. I'll be keeping an eye on other courses that this instructor has provided, i think that this is a very good value for money.

By Shahram Vazirnezami on 1/19/2022

This was a great course with great instructor. I originally got this course as a reference. However, after going thru few sections I really liked the course and decided to finish it. The instructor is very knowledgeable and the exercises are very practical and useful. I really recommend it. I will be taking his other course on retrofit. Thank you

By Vishal Kumar Khatri on 6/8/2021

I loved the course very well. I was totally a beginner when I was starting this course. Catalin guided very well through out the course. Exercise part which is being included in this course that helped me a lot in thinking in my own way of solving the problems. I hope he makes more courses based on Android. Just go for the course who is really a beginner.

By Phillip Gibb on 1/8/2021

Great starting point for anyone wanting to get an all round view of Kotlin. It is long but worth it. I did the course already knowing my way around Kotlin and with lots of Java experience, yet there were enough gems to keep me interested

By Francis Irwin on 4/3/2020

This course really does go from the basics all the way to a working knowledge of Kotlin. Lots of practice exercises are available. Production value is merely decent but the information taught is top notch.

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