Build the Backbone of Scalable Applications — Be Our Java Expert

■ Job Title

Senior Java App Developer

■ Company Overview

Join a technology-driven organization committed to delivering high-performance, scalable, and secure digital solutions. Our teams work at the intersection of software engineering and enterprise-grade architecture to power mission-critical systems.

■ Your Role and Responsibilities 

• Design, develop, and implement Java-based applications and microservices following best practices.
• Write clean, efficient, and well-documented code using modern frameworks such as Spring Boot, Quarkus, Apache Camel, and others.
• Participate in all phases of the software development lifecycle—requirements gathering, design, coding, testing, deployment, and maintenance.
• Implement and maintain RESTful or SOAP APIs.
• Ensure code quality and reliability through unit, integration, and end-to-end testing.
• Use test automation and static analysis tools to enforce security and performance standards.
• Troubleshoot, debug, and optimize application performance and scalability.
• Work with relational and/or NoSQL databases and develop efficient data access layers.
• Collaborate with cross-functional teams including product owners, designers, QA, and DevOps.
• Participate in agile ceremonies such as sprint planning, daily stand-ups, and retrospectives.
• Contribute to code reviews and promote a culture of continuous improvement.
• Stay updated on the latest trends in Java development and bring innovative ideas to the team.
• Deploy and maintain applications across various environments, including cloud and on-premise.

■ Experience and Qualifications

• Expertise in Java development, including experience with frameworks like Spring Boot, Apache Camel, and/or Quarkus.
• Proficient in writing automated tests (UT/ITa/ITb/E2E), as well as using static code analysis and performance tools.
• Strong understanding of application architecture and microservices design.
• Hands-on experience with web services (REST and/or SOAP) and database technologies.
• Experience with troubleshooting, debugging, and performance tuning in production environments.
• Business level Japanese and English (Customer facing experience is a plus)

■ Additional Preferred Qualifications

• Familiarity with Jakarta EE (formerly Java EE), Hibernate/JPA.
• Experience in deploying applications in hybrid or cloud-native environments.
• Background in working with DevOps and CI/CD pipelines.
• Understanding of agile development methodologies and cross-team collaboration.

■ Good Reasons to Join

• Join a high-impact team working on large-scale enterprise systems.
• Access to advanced tools, modern frameworks, and continuous learning opportunities.
• Contribute to mission-critical systems in a collaborative, agile environment.
• Flexible work culture and hybrid/remote options available depending on the project.

■ Work Location

Tokyo