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NTT DATA Logo NTT DATA · IT - Software Development

Offensive Security Tester

United Kingdom, London · Job Posted March 25, 2026
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Job Description

The Offensive Security Consultant role involves leading advanced penetration testing engagements, utilizing threat intelligence to simulate real-world attacks across various environments. Candidates should have a minimum of 5 years of experience in penetration testing, strong communication skills, and relevant certifications such as CREST CRT. This position offers opportunities for professional growth and collaboration with diverse teams.

Job Responsibility

  • Lead and manage the full lifecycle of complex penetration testing engagements
  • Execute advanced penetration tests across a broad range of environments (applications, infrastructure, web, APIs, O365, Azure, AWS, OT)
  • Develop and maintain sophisticated test plans, execution plans, and targeted use cases
  • Identify and prioritize OT and IT assets, services, and systems based on their criticality and potential exposure
  • Strategically prioritize, plan, and schedule penetration testing engagements
  • Produce high-quality, detailed reports
  • Clearly and effectively communicate complex security concepts
  • Collaborate closely with client IT and cybersecurity teams
  • Track the progress of remediation efforts
  • Conduct proactive security research and contribute to the creation of technical content
  • Contribute to strengthening security monitoring (blue team) capabilities
  • Drive the patching regime for identified vulnerabilities

Requirements

  • Minimum of 5 years of demonstrable professional experience in penetration testing
  • Strong emphasis on understanding, emulating, and leveraging adversarial tactics and threat intelligence
  • Comprehensive understanding of OT and IT asset profiles, technologies, and security best practice principles
  • In-depth knowledge of network protocols, cryptography, security vulnerabilities, and common attack vectors
  • Demonstrated proficiency in utilizing a wide range of penetration testing tools and methodologies
  • Proven experience in scoping and executing complex penetration tests
  • Exceptional written and verbal communication skills
  • Strong organizational and time management skills
  • Current CREST CRT certification or higher is essential
  • Must hold or be eligible for SC Clearance

Nice to have

  • Experience with Breach Attack Simulation tools and methodologies
  • Experience in Vulnerability Management processes and integrating threat intelligence
  • Understanding of Risk Management frameworks and how threat intelligence informs risk assessments
  • Hands-on experience with security reviews of AWS, Azure, and GCP environments, incorporating cloud-specific threats
  • Experience with ISO 27001 auditing/implementation, understanding the role of threat intelligence in compliance
  • Other advanced cybersecurity certifications such as CISM, CISSP, ECSA, CREST CCT

What we offer

  • Tailored benefits that support physical, emotional, and financial wellbeing
  • Continuous growth and development opportunities
  • Flexible work options
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