Join a major global technology organization in Tokyo as a Senior Java Software Engineer, developing and operating a high-scale communication platform that serves millions of users every day.

You will design, build, migrate, test, and operate distributed services supporting campaign management and personalized communications across a large digital ecosystem. Working with engineering teams across Japan, India, and Singapore, you will apply your expertise in Java, distributed systems, microservices, CI/CD, and cloud-native technologies to solve complex engineering challenges at scale.

The role also provides exposure to AI-assisted software development, modern engineering practices, and large-scale system architecture within an international technology environment.
Key Responsibilities

• Design, develop, migrate, and test core distributed services and microservices within the Communication Platform.
• Build scalable backend systems that support campaign management and personalized communications for millions of users.
• Use AI-assisted engineering workflows to explore new design approaches and improve development efficiency and user experiences.
• Expand automated test coverage and implement software engineering best practices to maintain system quality, reliability, and performance.
• Write clean, scalable, and maintainable Java code across the software development lifecycle.
• Conduct peer code reviews and create clear documentation for software architecture and technical designs.
• Work with CI/CD and container technologies to support reliable application development and deployment.
• Collaborate with cross-functional engineering teams across Japan, India, and Singapore to achieve shared product and technology goals.

Required Skills and Qualifications Experience:

• 5+ years of hands-on professional software development experience.
• Strong programming expertise in Java.
• In-depth knowledge of distributed systems and microservices architecture.
• Hands-on experience with CI/CD pipelines and technologies such as Jenkins, Docker, and Kubernetes.
• Experience with automated testing frameworks or approaches such as Karate, BDD, and Cucumber.
• Experience writing maintainable production code and participating in code reviews and technical documentation.

Soft Skills:

• Strong interpersonal and cross-cultural communication skills.
• Collaborative mindset with the ability to work effectively across international engineering teams.
• Ability to align with cross-functional technical stakeholders and contribute toward shared product goals.
• Strong problem-solving skills when working with complex, high-scale software systems.
• Proactive approach to software quality, reliability, and continuous improvement.

Language Requirements:

• Japanese: Basic
• English: Intermediate/Business

Preferred Skills & Qualifications

• Previous experience or technical knowledge within the email technology or digital communication industry.
• Experience with modern frontend frameworks such as React or Angular.
• Strong ownership and initiative across the complete software development lifecycle.
• Experience working on high-traffic platforms or large-scale distributed applications.
• Exposure to AI-assisted software engineering tools and workflows.
• Experience collaborating with globally distributed engineering teams.

About the Company
A major global technology organization operating a large, interconnected digital ecosystem used by millions of users. Its engineering teams develop sophisticated marketing and communication technologies supported by high-scale distributed systems, modern cloud architectures, and AI-assisted development tools.

You will join a global technology community of more than 150 domain experts across Tokyo, Singapore, and India, providing opportunities to exchange knowledge and solve complex real-world engineering challenges in an international environment.
Why You'll Love Working Here

• Develop high-scale distributed systems serving millions of users.
• Strengthen your expertise in Java, microservices, Kubernetes, Docker, CI/CD, and automated testing.
• Gain hands-on exposure to AI-assisted engineering tools and modern software development practices.
• Collaborate with more than 150 technology specialists across Tokyo, Singapore, and India.
• Work in a flexible hybrid environment with a casual dress culture.
• Enjoy complimentary meals through the on-site employee food hall.
• Receive health, labor, and employment insurance coverage as well as monthly transportation support.
• Build valuable experience solving complex engineering challenges within a major global technology organization.

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