Event overview

DroidKaigi 2025 Workshop Day will provide hands-on content that only DroidKaigi 2025 In-Person participants can apply for.
Please purchase DroidKaigi 2025 tickets and apply.

Note:
The number of participants is limited on Workshop Day, so please apply early.
Those who will join our scholarship program cannot apply.
There are no plans to publish the contents of this workshop after this event ends.
Lunch will not be provided.

For detailed information on DroidKaigi 2025, please visit our official page and DroidKaigi 2025 ticket sales page.

Schedule

Wed, 10 September 2025

Time	Contents
12:00-13:00	Reception hours
13:00-13:30	Welcome Talk
13:30-17:30	Workshop
17:30-18:00	Closing

Ticket summary

For this event, those who have tickets for DroidKaigi 2025 can apply to participate on a first-come, first-served basis.
The number of participants is limited.

• Price: Free
• First come first served

About the Workshop

We will be inviting Sebastian Aigner and Márton Braun from JetBrains to host the Workshop.
All content is provided in English, and simultaneous interpretation will not be provided.

DroidKaigi staff members will provide technical support, so please feel free to apply regardless of your English proficiency.
You will need to bring your laptop to participate. Detailed setup instructions will be provided at a later date.

Workshop Details

Updated: 27th Jul.

Title: Building cross-platform apps in Kotlin with Compose Multiplatform

In this workshop, you'll learn how Kotlin Multiplatform and Compose Multiplatform make it possible for you to build great cross-platform applications with maximum code reuse.

We’ll briefly cover the fundamentals of working with Kotlin Multiplatform, with its unique ability of interfacing with platform capabilities and the ecosystem of KMP libraries that support you in developing your apps.

Then, we’ll turn our attention to the main focus of the workshop: building with Compose Multiplatform, the shared UI framework for Android, iOS, Desktop, and Web, which allows you to use already well-established APIs on entirely new platforms.

During the workshop’s practical tasks, you’ll work with Compose code to build new features using Compose Hot Reload, load images from the network, manage persistence with the Room database, and put architecture components like ViewModels, lifecycle, and navigation to use.

Covering the latest available APIs and best practices, we’ll equip you with everything you need to start using Compose Multiplatform in your own apps!

A basic understanding of Jetpack Compose is required for this workshop. Basic understanding of Kotlin Multiplatform concepts can be beneficial, but aren’t required.

Instructor

Sebastian Aigner
Developer Advocate at JetBrains

Márton Braun
Developer Advocate at JetBrains

Venue overview

Venue name: Bellesalle Shibuya Garden
Address: 1F, Sumitomo Fudosan Shibuya Garden Tower, 16-17 Nanpeidaicho, Shibuya-ku, Tokyo
https://goo.gl/maps/AvGs2DFv4CXiCb2FA

Facilities

We will provide Wi-Fi networks available for participants.

How to check-in

At the reception, please present the two QR codes for the ticket on this page and the ticket for DroidKaigi 2025 from the Doorkeeper ticket email.

Note:
If you do not have a DroidKaigi 2025 ticket, you will not be able to enter.
To avoid crowding at the reception, please be sure to open the QR code while lining up.

Notes on registration

• Please purchase a ticket for DroidKaigi 2025 and apply.
• Speakers (including co-speakers) do not need to purchase a ticket for DroidKaigi 2025. If you would like to participate in Workshop Day, please apply from this page without purchasing a ticket for DroidKaigi 2025.
• Those who will join our scholarship program cannot apply.
• If you need to cancel your participation, please withdraw it from this page.

Other notes

• There will be photography and press coverage during the event. The photos taken may be posted on the Internet for the purpose of promoting the event. Thank you for your understanding.
• DroidKaigi staff members may take photos on the day and use them for public relations activities. We cannot respond to inquiries via Doorkeeper. If you have any questions, please contact us at info@droidkaigi.jp.
• We are working to ensure the safety and security of everyone coming to DroidKaigi 2025, by cooperating with the local governments, especially the Tokyo municipality where the venue is located, public health centers and other administrative bodies under its jurisdiction, as well as the venue providers. We plan to provide lunch boxes and hold a meetup, but there might be changes by the time of the event in September 2025 depending on the situation regarding COVID.