Security Architect (SIEM & IR Security Engineering) - Rakuten-CERT Section, Cyber Security Defense Department (CSDD)

Job Description

The role designs, implements, and improves security information and event management (SIEM), incident response, detection, and security monitoring capabilities within Rakuten-CERT. Candidates are expected to have practical experience in security architecture, SIEM platforms, log management, threat detection, incident investigation, and security engineering. Knowledge of cloud environments, network security, scripting, automation, and frameworks such as MITRE ATT&CK is highly valuable. The position requires strong problem-solving, communication, documentation, and collaboration skills, as the successful candidate will work with technical teams across Rakuten to protect systems and respond to cyber threats.

Company Info

Rakuten Group, Inc. is a major Japanese technology and internet company headquartered in Tokyo. Founded in 1997, it operates a broad ecosystem spanning e-commerce, fintech, mobile communications, digital content, online advertising, travel, and professional sports. Its services are used by millions of customers in Japan and internationally, supported by the Rakuten membership and points ecosystem. Rakuten is also expanding its cloud, telecommunications, artificial intelligence, and cybersecurity capabilities. The company employs a diverse, multinational workforce and commonly uses English in many corporate and technology roles. Working at Rakuten can provide exposure to large-scale platforms, complex international operations, and security challenges across multiple business sectors. The Rakuten-CERT team supports enterprise-wide cyber defense, security monitoring, incident response, and resilience across the group.

Destination Guide

Japan offers strong opportunities in cybersecurity, software engineering, cloud computing, telecommunications, finance, and international business, especially in Tokyo, Osaka, and major regional cities. Workplace culture values reliability, teamwork, preparation, and respect for hierarchy, although global technology companies often have more flexible and English-friendly environments. Japan provides excellent public transport, high safety, quality healthcare, rich food culture, and varied lifestyles from urban living to rural and coastal communities. Housing and commuting costs are generally highest in Tokyo. Skilled foreign professionals typically need an appropriate work visa, often sponsored by their employer; common routes include Engineer/Specialist in Humanities/International Services and Highly Skilled Professional visas. Applicants should prepare academic and employment documents, and family members may qualify for dependent visas. Learning basic Japanese greatly helps with daily life, administration, and social integration.