Senior Penetration Tester

Integrity360; Dublin; On-site; EUR 60,000 - 80,000; Full time

Job summary

Integrity360 is looking for a skilled Penetration Tester to join our team in Dublin. The ideal candidate will have over 5 years of experience in information security and penetration testing across various environments. Responsibilities include conducting advanced security assessments, mentoring junior testers, and producing detailed technical reports. Strong communication skills, a Bachelor’s degree in a related field, and current certifications are essential. We offer an innovative work environment where you can grow your career and contribute to our cybersecurity success.

Qualifications

• 5+ years of relevant professional experience in penetration testing.
• Security Clearance or local vetting as required.
• Broad understanding of hosting/cloud environment.

Responsibilities

• Perform advanced manual penetration tests across multiple platforms.
• Produce high-quality technical reports for diverse audiences.
• Mentor junior testers and support their development.

Skills

Information security experience

Penetration testing

C/C++, C#, VB.NET, ASP, PHP, Java, Python or Ruby

Unix security skills

Windows security skills

Networking security skills

Manual penetration testing

Communication skills

Custom scripts or tools for vulnerability identification

Networking knowledge

Security auditing tools understanding

Ethical hacking experience

Reporting skills

Education

Bachelor’s degree in Computer Science, Cybersecurity, or related field

Relevant certifications such as OSCP, OSCE, OSEP, CRTO

Job description

About Us

Integrity360 is a leading independent cybersecurity and PCI specialist operating across Europe, Africa, the Caribbean, and North America. The company has office locations in Ireland, the UK, Bulgaria, Italy, Sweden, Spain, Lithuania, Ukraine, Africa, the Caribbean, and Canada, supported by six Security Operations Centres (SOCs) located in Dublin, Sofia, Madrid, Stockholm, Rome, and Cape Town. With over 780 employees, including more than 585 dedicated cybersecurity professionals, Integrity360 delivers a full suite of professional, support, and managed security services across the complete cyber risk lifecycle, from identification and prevention to detection, response, and recovery. Integrity360 supports over 3000 mid‑market and enterprise organisations across sectors including financial services, insurance, government, healthcare, retail, telecommunications, and utilities. At Integrity360, people come first. We invest heavily in learning, development and progression, fostering a dynamic culture where innovation, collaboration and continuous growth are at the heart of what we do.

Role Overview

We’re looking for a Penetration Tester with at least 5 years of real‑world professional experience, fully independent, with consultancy and tutoring skills and experience. In this role, you’ll support and deliver testing projects (web, infra, cloud, AD, and mobile and not limited to), guided by experienced technical leaders. You’ll be involved in pre‑sales activities, travelling onsite on customer environments and delivering high‑quality services.

Job Role / Responsibilities

As a Senior Security Tester, you will deliver advanced penetration testing and security assessments across a wide range of environments and technologies. You will also contribute to internal capability development, collaborate with other departments, and represent Integrity360 in client engagements and technical forums. This role blends deep technical expertise with excellent communication and documentation skills.

Core Responsibilities

Security Testing & Delivery

• Perform advanced manual penetration tests and technical security assessments (web, mobile, infrastructure, cloud).
• Execute Red Team or assumed breach engagements as part of a team or independently.
• Identify, exploit, and document vulnerabilities in complex systems, clearly articulating risk and remediation to stakeholders.
• Review application architectures and source code for security weaknesses.

Reporting & Communication

• Produce high‑quality technical reports and executive summaries tailored to various audiences.
• Present findings to clients and internal stakeholders in a clear and professional manner.

Research & Innovation

• Continuously research new vulnerabilities, attack techniques, and tools to stay ahead of evolving threats.
• Contribute to the development of internal methodologies, tools, and automation scripts.

Internal Support & Mentoring

• Act as a mentor for junior and mid‑level testers, supporting their growth and development.
• Support the testing team in delivery planning, documentation, and knowledge sharing.

Cross‑Team Collaboration

• Work closely with SDMs, Project Managers, and other technical teams to ensure smooth delivery.
• Support Sales and Marketing teams with technical insights for proposals, events, or webinars when needed.

Desired Skills

• Solid experience in information security.
• Industry experience working in Dev/Admin/Engineer field.
• Industry experience working in Information security field as a penetration tester.
• Development and/or source code review experience in C/C++, C#, VB.NET, ASP, PHP, Java, Python or Ruby.
• Strong Unix, Windows and networking security skills.
• Familiarity with general application and network security concepts.
• Excellent communication skills.
• Manual penetration testing experience above and beyond running automated tools.
• Experience developing custom scripts or tools used for vulnerability scanning and identification.
• In depth networking knowledge (ports, protocols, firewalls, routing, VPN, MPLS, BGP, OSPF, IPv6, TOR).
• Understanding of development frameworks.
• Broad understanding of hosting/cloud environment.
• Broad understanding of SIEM & Defensive Technologies.
• Understanding of Security Auditing tools.
• Ethical hacking experience.
• Intrusion prevention experience.
• Report writing experience.
• Presentation skills.
• Scripting/coding, sys admin or networking experience.
• Understanding of programming methodologies.
• Understanding of quality management and project management principles.
• Knowledge of advance cloud architecture.

Certifications / Qualifications

• Security Clearance or local vetting (as required by region or client sector).
• Relevant certifications such as OSCP, OSCE, OSEP, CRTO, CREST, or equivalent.
• Bachelor’s degree in Computer Science, Cybersecurity, or related field (or equivalent hands‑on experience).