Security Detection & Automation Engineer - Product Security Section, Cyber Security Defense Department (CSDD)

Role summary

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Rakuten is seeking a Security Detection & Automation Engineer to join its Product Security Section within the Cyber Security Defense Department. The role involves designing, developing, and maintaining security detection capabilities, automated response workflows, monitoring systems, and security tools that protect products and services. Candidates are expected to have experience in cybersecurity engineering, threat detection, incident response, scripting or software development, and security automation. Familiarity with cloud environments, SIEM platforms, logging, threat intelligence, DevSecOps, and languages such as Python is valuable. Strong analytical, problem-solving, communication, and collaboration skills are required. The successful candidate will proactively identify threats, improve detection accuracy, automate repetitive security processes, and work with engineering teams to strengthen Rakuten's overall product security posture.

About the employer

Rakuten Group, Inc. is a major Japanese technology and internet services company headquartered in Tokyo. Founded in 1997, it operates a broad ecosystem that includes e-commerce, fintech, mobile communications, digital content, travel, advertising, and online services. Rakuten is known for its membership-based ecosystem, which connects millions of customers and businesses through a common loyalty program. The company operates internationally and employs people from many nationalities, making English-language work possible in several technology and corporate roles. Its technology organization supports large-scale platforms, cloud services, telecommunications infrastructure, cybersecurity, data analytics, and software development. Rakuten generally promotes innovation, entrepreneurship, collaboration, and the use of technology to improve customer experiences. Roles in security and engineering may involve working with global teams, protecting high-volume consumer services, and helping develop secure products across a diverse digital business.

Working in Japan

Japan offers strong opportunities in software engineering, cybersecurity, cloud computing, telecommunications, finance, manufacturing, and research. Tokyo, Osaka, Yokohama, Nagoya, and Fukuoka are major employment centers, with international companies often recruiting English-speaking technology professionals. Japanese workplaces value reliability, teamwork, preparation, respect, and attention to detail, although global firms may have more flexible cultures. Lifestyle varies from energetic city living to quieter regional communities. Public transportation is excellent, healthcare is accessible, and daily life is generally safe, though housing and commuting costs in Tokyo can be high. Eligible professional employees usually need an Engineer/Specialist in Humanities/International Services visa, supported by the employer; highly skilled professionals may qualify for a faster-track visa. Applicants should prepare qualifications, employment history, and proof of education. Relocating often requires arranging housing, residence registration, health insurance, a bank account, and tax procedures. Learning basic Japanese is highly recommended for administration and daily life.