Demaecan Sponsors JJUG CCC 2026 Spring, Japan's Largest Java Community Event

Demaecan Sponsors JJUG CCC 2026 Spring, Japan's Largest Java Community Event

Demaecan Co., Ltd. announced today that it will serve as a booth sponsor for JJUG CCC 2026 Spring, one of Japan's largest Java community events, to be held on Saturday, May 30, 2026.

At the event, Demaecan will present a technical session featuring engineers who support the company's back-end systems and will operate a sponsor booth. By sharing practical knowledge of Java and Spring Boot, which support one of the largest delivery infrastructures in Japan, the company aims to contribute to the revitalization of the Java developer community while fostering an environment where engineers can thrive.

### Dedication to Java in Supporting Delivery Services

Demaecan is a delivery service operating in all 47 prefectures across Japan, processing over 60 million orders annually (as of the fiscal year ending August 2025). The company has long utilized Java and Spring Boot as the back-end technology for its large-scale platform. Everything at Demaecan, which supports the experiences of users, merchants, and delivery workers, is powered by a system infrastructure built on Java.

Through this sponsorship, Demaecan aims to share the technical insights and challenges gained while promoting the daily use of delivery services, and hopes to grow together with Java engineers. This marks the fifth consecutive sponsorship over three years, following the Spring and Fall editions of both JJUG CCC 2024 and 2025.

### Overview of Exhibit and Session

1. [Technical Session] - Title: "The Story of Implementing Demaecan's Menu Registration and Update API with Spring Boot + Kafka" - Presenter: Yuji Nakagawa, Merchant & Business System Development Dept., Product Development Division, Demaecan Co., Ltd. - Overview: This session will discuss how the menu integration functionality was built using Spring Boot and Kafka. The presenter will share the chosen architecture, design trade-offs, and implementation efforts required to process massive amounts of menu information within a strict time limit, featuring actual code and architecture diagrams.

2. [Booth] Engineers from Demaecan will be on-site to explain the company's tech stack, development environment, and the technical challenges the team faces. Visitors are encouraged to stop by. - Tech Board Display: Explanations and discussions based on Demaecan's service architecture diagrams. - Novelty Distribution: Original Demaecan merchandise will be distributed to attendees.

### Event Details: JJUG CCC 2026 Spring

- Event Name: JJUG CCC 2026 Spring (Japan Java User Group Cross Community Conference) - Date/Time: Saturday, May 30, 2026, 9:30 - 17:15 (Doors open around 9:20) - Venue: Bellesalle Shinjuku Grand Conference Center - Organizer: Japan Java User Group (JJUG) - Details: https://ccc2026spring.java-users.jp/