The Senior Cyber Threat Hunter will proactively identify and mitigate advanced threats to strengthen Rakuten Mobile's cyber defense posture. The role develops and executes hypothesis-driven hunts, analyzes security data, and translates findings into actionable detection improvements while supporting incident investigation and containment.
Provide L2/L3 troubleshooting support for 5GC E2E operations and resolve technical issues across Core & Cloud. The role includes operational analysis, audits, change implementation, incident support, and collaboration with internal teams, partners, and vendors. The position is based in the Tokyo office.
Design and develop container-based virtualization infrastructure for mobile communication systems. The role integrates hardware, operating systems, virtualization infrastructure software, and third-party components, and includes infrastructure automation, performance tuning, and implementing functionality to support stable and efficient service delivery.
Resolve enquiries from Japanese Slack customers via email and chat, primarily in Japanese, with occasional support for customers in Korea and internal communications in English. Triage customer requests, identify and document bugs, test new features and fixes with product development and QA, and share customer feedback.
As a Technical Lead, Assisted Services within Premium Network Services, this role manages and executes customer change requests for customers contracted to Assisted Services. It involves validating customer requirements, implementing network changes across IP and SD-WAN technologies, and coordinating delivery with customers and internal teams.
Lead the recruitment lifecycle for Japan, attracting and hiring talent across diverse functions. Partner with hiring managers, HR business partners, and senior leaders to drive strategic recruitment initiatives, improve candidate and hiring manager experiences, and meet business needs and organizational goals.
Serve as the Customer Lead Engineer for assigned strategic customers, acting as the primary engineering advocate and technical lead for the MCSfMSC engagement. Lead responses to high-severity incidents and escalations, drive customer service improvement plans and health reviews, and use engagement insights to improve mission-critical services.
This senior infrastructure engineer role focuses on core Microsoft infrastructure technologies, scripting, and automation, and is based at the Tokyo Headquarters while working with global teams. Responsibilities include managing public cloud platform services and server environments, improving operational processes through automation and AI, contributing to global projects as a lead engineering resource, and serving as a final-tier escalation point.