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Senior Penetration Tester (Cyber Security) - Tokyo, Japan

ideal folks llc • Japan
Visa Sponsorship
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AI Summary

Senior Penetration Tester role focused on securing advanced cloud-native telecom networks, including 4G/5G platforms, AI/ML systems, and APIs. Responsibilities include manual/automated penetration testing, AI/ML security assessments, red teaming, and vulnerability research. Requires 10+ years of hands-on penetration testing experience with expertise in web, mobile, cloud, and AI security.

Key Highlights
10+ years of penetration testing experience required
Focus on securing cloud-native telecom networks, AI/ML systems, and APIs
Visa sponsorship available
Key Responsibilities
Conduct manual and automated penetration testing of web/mobile applications, APIs, cloud platforms, and network infrastructure
Evaluate AI/ML systems for vulnerabilities such as prompt injection, data leakage, and AI supply chain risks
Execute security assessments on telecom-specific systems including BSS/OSS applications and eSIM platforms
Support red team exercises 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 remediation recommendations
Research emerging attack techniques and AI-assisted offensive security methods

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Technical Skills Required
Penetration Testing AI/ML Security Cloud Security (AWS/Azure/GCP)
Benefits & Perks
Visa sponsorship
Competitive salary (Japanese Yen 6-10M total)
Stock options

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Nice to Have
Experience with telecom technologies and mobile core networks
Certifications such as OSCP, CRTP, CRTO, OSEP, OSWE, GPEN, or GXPN
Specialized skills in AI/LLM security testing and adversarial machine learning
Red team operations and advanced exploit development

Job Description

As Senior Penetration Tester, 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.

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.

Job Duties

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Job Overview
Posted Nov 12, 2026
Employment Full-time
Experience Mid-Senior level
Location Japan
Category Cyber Security
Company ideal folks llc
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