Senior Penetration Tester, Security Operations Center Group -Cyber Defense Operations Section (RMI Security Eng. & Ops Dep)
Rakuten Mobile, Inc.Japan
Posted February 20, 2026
Full Time
About the Company
Rakuten Mobile, Inc. is a Rakuten Group company responsible for mobile communications, centered on its mobile network operator (MNO) business. Through continuous innovation and the deployment of advanced technology, Rakuten Mobile aims to redefine expectations in the mobile communications industry in order to provide appealing and convenient services for diverse customer needs.
Job Description
We are looking for a seasoned Senior Penetration Tester with 10–12+ years of hands-on experience in offensive security to lead complex penetration tests across web, mobile, API, internal infrastructure, and cloud environments.
Requirements
- 10–12+ years of hands-on penetration testing, red teaming, or offensive security experience.
- Strong expertise in web, mobile, API, network, and infrastructure security.
- Solid experience with cloud environments (AWS, Azure, GCP).
- Understanding of OWASP, PTES, MITRE ATT&CK, and modern adversarial techniques.
- Proficiency with tools such as Burp Suite Pro, Nmap, Metasploit, Cobalt Strike, BloodHound, Kali Linux.
- Strong scripting skills (Python, Bash, PowerShell).
- Familiarity with AI/ML concepts and LLM-based applications.
Benefits
- Generous Paid Time Off
- 401k Matching
- Retirement Plan
