Senior Java Full Stack Developer

Appealing Points

• Take on a technical leadership role, driving modern engineering practices (Agile, DevOps, CI/CD) while mentoring junior engineers
• Work hands-on with cutting-edge cloud-native technologies (AWS, Kubernetes, Docker) and microservices architecture
• Flexible employment options — both contract and permanent placement available, with a hybrid work model

Annual Salary: ¥7 Million and above

Job Responsibilities

Software Development & System Design

• Design, develop, and maintain robust, scalable, and high-performance applications
• Implement trunk-based development practices to enable continuous integration and rapid delivery
• Develop clean, maintainable, and testable code following SOLID principles and software design best practices
• Ensure high levels of unit test coverage, test-driven development (TDD), and behavior-driven development (BDD)
• Actively contribute to hands-on coding, code reviews, and refactoring to maintain high engineering standards

Engineering Excellence & Best Practices

• Drive the adoption of modern engineering ways of working, including Agile, DevOps, and CI/CD
• Advocate for automated testing, infrastructure as code, and continuous monitoring to enhance software reliability
• Apply BDD, TDD, and unit testing to ensure code quality and functionality
• Conduct thorough code reviews, ensuring adherence to best practices in readability, performance, and security
• Implement and enforce secure coding practices, performing vulnerability assessments and ensuring compliance with security standards
• Collaborate effectively in agile environments, embracing DevOps principles and fostering continuous delivery and improvement

Technical Leadership & Collaboration

• Partner with architects, product owners, and cross-functional teams to design scalable and distributed systems
• Mentor junior engineers and foster a culture of engineering excellence and continuous learning
• Collaborate closely with DevOps teams to optimize deployments, observability, and production resilience
• Lead technical discussions and contribute to design documentation

Required Qualifications

• Strong hands-on experience in Java; working knowledge of C++ is a plus
• Deep expertise in system design and microservices architecture
• Experience with trunk-based development, feature flags, and progressive delivery strategies
• Proficiency in TDD, BDD, and an automation-first mindset to ensure high test coverage and reliability
• Strong understanding of CI/CD pipelines and DevOps practices
• Experience conducting code reviews, vulnerability assessments, and secure coding
• Familiarity with modern cloud-native technologies (AWS, Kubernetes, Docker)
• Excellent problem-solving skills and ability to work in fast-paced, agile environments
• Strong communication and collaboration skills
• Mandatory skill: Full Stack Java (Enterprise)

Preferred Qualifications

• Experience with event-driven architecture and distributed systems
• Knowledge of performance tuning, observability, and production monitoring
• Familiarity with Agile frameworks and modern ways of working in product development

Language Required - Business level Japanese (N2 and above) and Business level English

About Company

A leading global information technology, consulting, and business process services company. We harness the power of cognitive computing, hyper-automation, robotics, cloud, analytics, and emerging technologies to help our clients adapt to the digital world and make them successful. A company recognized globally for its comprehensive portfolio of services, a strong commitment to sustainability, and good corporate citizenship, we have over 160,000 dedicated employees serving clients across six continents. Together, we discover ideas and connect the dots to build a better and bold new future.

[Measures against passive smoking]

No smoking indoors allowed

Designated smoking area

. Skillset Required: Agile, DevOps, CI/CD, Java, C++, System Design, Microservices Architecture, Trunk-based Development, Feature Flags, Progressive Delivery, TDD, BDD, Automation, CI/CD Pipelines, Code Reviews, Vulnerability Assessments, Secure Coding Practices, AWS, Kubernetes, Docker, Problem-solving, Communication, Collaboration, Full Stack Java, Event-driven Architecture, Distributed Systems, Performance Tuning, Observability, Production Monitoring, Agile Frameworks, Business level Japanese, Business level English