Security Architect (Cloud Monitoring & Response) - Product Security Section, Cyber Security Defense Department (CSDD)

The Cyber Security Defense Department (CSDD) is responsible for safeguarding all Rakuten companies and users from cyber threats, ensuring the security and integrity of Rakuten Group's global internet services.

We oversee all aspects of both Secure Development and Security Operations for services developed within the group, with dedicated security teams and operation centers strategically located in key regions worldwide.

To design and evolve a world-class security monitoring and response ecosystem that provides deep observability and rapid defense capabilities across Rakuten’s global hybrid cloud infrastructure, ensuring our ecosystem is both secure by design and resilient by default.

We are looking for a visionary Security Architect to lead the design of our global cloud security monitoring and incident response infrastructure. You will be the technical authority responsible for creating the blueprint for how we ingest, analyze, and act upon security telemetry for our private cloud environments. You will bridge the gap between high-level security strategy and technical implementation, ensuring our platforms are capable of detecting and neutralizing advanced threats at scale.

・Design and architect the next-generation security monitoring platform (SIEM/Data Lake/SOAR) capable of handling massive telemetry volume across a global, private cloud footprint

・Define the architectural patterns for high-fidelity detection, ensuring that security logs, cloud-native telemetry, and endpoint data are effectively correlated

・Architect the automated response framework (SOAR) to ensure we can contain threats at machine speed, minimizing the impact of incidents on production

・Collaborate with SRE and Cloud Platform teams to embed "Security Observability" into our infrastructure, ensuring we have the visibility required for modern threat hunting

・Evaluate and select security technologies (commercial and open-source) that align with Rakuten’s scale, latency requirements, and long-term security goals

・Establish global architectural standards for logging, monitoring, and response to ensure consistency across all Rakuten business units