Let's learn Kotlin on the backend

Hello ๐Ÿ‘‹

My name is Piotr Wolak and I will help you learn Kotlin and backend skills.

Below you can find my courses, as well as free series.

Image presents a photo of Piotr Wolak - founder of Codersee and instructor of the course.

My Courses

Learn Kotlin in a clear, step-by-step way withย The Complete Kotlin Course 2023: From Zero to Expert.ย 

Become a sought-after Kotlin professional with structured lessons, engaging exercises, and expert support.

This free course is everything you need to know to authenticate and authorize users, assign and verify roles, generate JWT access tokens, and implement a JWT refresh token flow.


I really put a lot of heart and effort into creating valuable courses and learning materials.

Below you can find what other people think about them ๐Ÿ˜‰

Free tutorials and courses on Kotlin & backend

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