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Kotlin Training Certified by JetBrainsGoogle Developer Expert Android 2026

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Carlos Piña

Carlos Piña

Android Eng. > Openbank

Mary Reza

Mary Reza

Expert Architect > NTT DATA

Alberto Díaz

Alberto Díaz

Apps Director > Sngular

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Claudia Luque Fernández
M-KOPA

I found the course very useful and productive. Antonio and Nino have really put in the work to make sure it is so.

The truth is that I had some experience with prompts and Claude Code, but I needed to enrich it with the basic fundamentals, MCPs, skills, and the different...

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Miguel Zaragoza

I totally recommend the AI-Expert training.

Thanks to Antonio and Nino, I have gone from a superficial use of AI to being able to develop code in languages that are new to me.

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Iván Yael García Pérez

The training has been extremely valuable, the knowledge that has been shared and the way it was delivered truly meant a total change in the paradigm I had.

Although I already had some experience using AI tools, I wasn't entirely sure how to use them correctly to avoid falling into Vibe...

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Juan Gabriel Pérez Leo
CapGemini

The course has been impressive for several reasons.

The order of the lessons seems very appropriate to me, allowing you to go from less to more, the quality of the classes has been very good, with unbeatable treatment, and moreover, they have managed to cover a lot of information in a...

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Daniel Benítez de Haro

Thanks to this training, I have been able to unlock a new level in my career as a developer.

Now I understand how to integrate AI so it does the heavy lifting, while I take on a more strategic role, guiding it like a conductor.

If you want to transform the way...

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Santiago Pérez Barber
Bytacora Soluciones Informáticas SL

Excellent course.

You start out just "tinkering" with AI tools and end up mastering a set of resources that are useful for your daily work and exponentially increase your productivity.

At the end of the course, you feel like you've moved to the next level ;)

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Albert Martorell Garcia
Seidor Opentrends

I have taken several courses taught by Antonio, and all of them have met my expectations.

From my point of view, the strongest aspects are that the content is very well explained, structured, updated quite regularly, and there is a balance between theory and practice.

It is also very interesting that you...

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Ramsés Alarcón Córdova
Happydonia

A very interesting training, straight to the specific points to address. The introduction was clear and concise, the practical examples were very good, and the dynamics were spot on. I would definitely do it again!

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Juan José Bonillo Espinosa
Happydonia

A ton of useful knowledge as you always provide. I have learned a lot these days and I am already applying it at work :)

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Julián Marqués García
Dinamic Área Software S.L

There isn't much information about accessibility online. But you can tell that Antonio has worked hard on the course content. As always, everything is very well explained. Having the project repository with a commit for each exercise to review them at any time is very useful. They also handle FUNDAE....

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Francisco José Bermúdez Hermoso
Vass

If you want to get started with Compose and reach an intermediate-advanced level, this training is for you. With Antonio, you will achieve the necessary foundations to become an expert in Compose. Also, you will understand everything perfectly.

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Joaquim Puyo Garrido
Rakuten TV

An essential course for both junior and more senior profiles. I really liked the short video format, and I also want to highlight that throughout the course, the material has been updated.

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Joaquim Puyo Garrido
Rakuten TV

Despite already having 10 years of experience in Android, the Testing Expert course has completely met my expectations.
The short video format seemed very appropriate to me, and the test configuration section is gold!

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Liset Beatríz Armas Aguila
YPSOMED

The course "Kotlin Expert and Jetpack Compose" by Antonio Leiva has been a transformative experience for me as an Android developer. Antonio explains advanced Kotlin topics, such as coroutines and functional programming, with clarity and depth, while the practical approach to Jetpack Compose allowed me to master this new declarative...

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Julián Marqués García
Dinamic Área Software S.L

My experience with the course has been very good. Each module is structured in clear and concise videos that explain the concepts, accompanied by code examples. The style is what Antonio has accustomed us to on YouTube, with clear, well-organized, and easy-to-follow explanations.

In a short time, you can get up...

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Pedro Aguilar Fernández

My experience in Architect Coders has been wonderful. From day one, Antonio and his team gave me unconditional support. At first, facing new challenges wasn’t easy, but with effort, desire, and enthusiasm, I managed to overcome my obstacles. I greatly value all the knowledge acquired during this time. Thank you,...

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Javier Carrasco
Profesor de Informática

I have nothing but words of gratitude. This course has helped me consolidate knowledge and discover others I didn’t know, helping me improve. I’m glad that the Kotlin community keeps getting bigger.

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Alex Tolón Gimeno

The course is well structured and is aimed at building code as the concepts are explained.

It’s true that the pace of technology updates hasn’t been fully reflected in this current version of the course, so sometimes applying certain dependencies (and the appearance of the Kotlin 2.0 compiler) creates learning bottlenecks...

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Guillermo González
Software Engineer

It has everything I needed to advance my knowledge of Jetpack Compose, and even has some extras that are worth their weight in gold!

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Francesc Perez
Senior Android Developer

Once again, a DevExpert course does not disappoint. Congratulations to the team for creating such a complete course on such a new technology. Your set of courses is essential for any Android developer to stay up to date in an environment that evolves so quickly and can be hard to...

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Oleksandr Tymoshenko
Mobile Developer

First of all, congratulations on the course!
I really liked the first part, which dealt with the technical topics of the language itself, although I have to say I missed more examples and more details on usage.
Regarding the second part, the multiplatform one, I found it very difficult to follow Antonio...

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Jose V. Mirabel

I thought it was an amazing training! There are many details of Kotlin that I didn’t have much control over and now I know what’s going on. Now it’s time to keep working and get into the habit until it comes naturally.
I’d like to highlight that there are many trainings...

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Victor Manuel Crespo Martín

I really liked the training. I think it’s a very complete course with lots of exercises to try to develop the theory.

DevExpert logo for Juan Jose Bonillo Espinosa
Juan Jose Bonillo Espinosa
Happydonia

Tremendous course from the great Antonio Leiva. If you used to get stuck with tests or didn’t understand how to do them, with this course that will be a thing of the past. Highly recommended.

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Josué Galindo
Desarrollador Android

The Architect Coders course met expectations, covering the important topics to know everything necessary to give any developer that boost. Also, the Android Boost course to learn Kotlin was included and was very useful.

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Victor Manuel Crespo Martín

I thought it was a very good course. It’s true that I missed having more exercises and some kind of final evaluation test. Also, the part about Kotlin Multiplatform regarding iOS—if you don’t have an iOS device, it’s impossible to practice, but that’s out of your control.
But overall, I think...

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Juan José Bonillo Espinosa
Android Developer

With this course you will learn everything you need to handle Jetpack Compose in Android.
Also, you won’t just stay at the basics, you’ll go deeper into its components and functions.
Definitely a great investment.

DevExpert logo for Roberto Muñoz Rodríguez
Roberto Muñoz Rodríguez
Desarrollador Android

All I can say is thank you for everything I’ve learned. Antonio is a great teacher. After taking several courses, I can confidently say this is the most complete one. He squeezes the technology to a point where you learn unique things. I’m leaving very happy with everything I’ve learned....

DevExpert logo for MANUEL MARÍA ALCONCHEL FERNÁNDEZ
MANUEL MARÍA ALCONCHEL FERNÁNDEZ
ANDROID ENGINEER

A totally necessary course to be able to understand everything involved in creating an Android project from scratch and how to understand the subtleties of clean code and a truly robust architecture.

DevExpert logo for Santiago Mattiauda
Santiago Mattiauda
MercadoLibre

A super comprehensive training, I recommend it for those who are not only starting with testing in Android but also for those who have already been working with Android for some time and want to add an extra boost to the quality of their solutions. You will not only learn...

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I have spent more than 12 years working in software development. During that time, I became an Android Engineer, a Google Developer Expert for Android, an official JetBrains training partner, and wrote and published my own book, “Kotlin for Android Developers”.

My name is
Antonio Leiva

Antonio Leiva
Kotlin Training Certified by JetBrainsGoogle Developer Expert Android 2026

Where you may have seen me

BBVA
Codemotion
Deloitte
Eventbrite
Globant
Google
Idealista
Kairos
NTT Data
Sngular
Telefónica
Wallapop