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About the Role

At Rakuten Mobile Security Assurance, you will help secure one of the world's most advanced cloud-native telecom networks, protecting millions of customers across digital, mobile, cloud, and AI-driven services. We work on cutting-edge offensive security challenges spanning 4G/5G telecom platforms, cloud-native infrastructure, APIs, AI/ML systems, and emerging technologies. We offer an environment where innovation is encouraged, continuous learning is supported, and security experts are empowered to make a direct business impact. You will work alongside industry-leading engineers, build next-generation security capabilities, leverage AI to transform security testing, and contribute to protecting critical telecommunications infrastructure at scale.

Responsibilities

Conduct manual and automated testing of web/mobile applications, APIs, cloud platforms, and network infrastructure.
Evaluate LLM-based systems, AI agents, RAG implementations, and MLOps pipelines.
Identify vulnerabilities such as prompt injection, insecure model integrations, data leakage, and AI supply chain risks.
Execute security assessments on telecom-specific systems, including BSS/OSS applications, eSIM platforms, subscriber management, and mobile network services.
Support red team exercises, conduct attack path analysis, and perform exploit validation using realistic attacker techniques.
Perform source code reviews, secure design reviews, and architecture-level security assessments.
Develop proof-of-concepts, create detailed technical reports, and provide actionable remediation recommendations.
Validate fixes through re-testing.
Research emerging attack techniques, exploit methodologies, and AI-assisted offensive security methods.

Requirements

10+ years of hands-on penetration testing and application security experience.
Deep expertise in web, mobile, API, cloud, infrastructure, and AI security testing.
Proficiency with Burp Suite, Kali Linux, Metasploit, BloodHound, Nmap, Nessus, and modern offensive security frameworks.
Strong knowledge of Python, JavaScript, Bash, or PowerShell for testing and automation.
Proficiency with cloud platforms (AWS, Azure, or GCP) and containerized environments (Kubernetes, Docker).
Experience with telecom technologies, mobile core networks, BSS/OSS systems, and cloud-native telecom applications.
OSCP, CRTP, CRTO, OSEP, OSWE, GPEN, GXPN, or equivalent certifications.
AI/LLM security testing and adversarial machine learning.
Red team operations and advanced exploit development.
Bug bounty, vulnerability research, and AI-assisted penetration testing.
English (Overall - 3 - Advanced)
Japanese (Overall - 2 - Intermediate)

Skills

Penetration Testing
Application Security
Web Security
Mobile Security
API Security
Cloud Security
Infrastructure Security
AI Security
LLM Security
Prompt Injection
Data Leakage
AI Supply Chain Risks
Telecom Security
BSS/OSS Systems
eSIM Platforms
Subscriber Management
Mobile Network Services
Red Teaming
Adversary Emulation
Attack Path Analysis
Exploit Development
Source Code Review
Secure Design Review
Architecture Security Assessment
Vulnerability Reporting
Remediation
Attack Techniques Research
Offensive Security
Python
JavaScript
Bash
PowerShell
AWS
Azure
GCP
Kubernetes
Docker
Adversarial Machine Learning
Bug Bounty
Vulnerability Research
AI-Assisted Penetration Testing

Experience Level

10+ years

About the Company

Rakuten Mobile Security Assurance helps secure one of the world's most advanced cloud-native telecom networks.
We protect millions of customers across digital, mobile, cloud, and AI-driven services.
We work on cutting-edge offensive security challenges spanning 4G/5G telecom platforms, cloud-native infrastructure, APIs, AI/ML systems, and emerging technologies.
We offer an environment where innovation is encouraged, continuous learning is supported, and security experts are empowered to make a direct business impact.
You will work alongside industry-leading engineers, build next-generation security capabilities, leverage AI to transform security testing, and contribute to protecting critical telecommunications infrastructure at scale.