Senior Penetration Tester

 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. These span 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. If you're ready to take your cyber security career to the next level, we’d love to hear from you. 

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)

#LI-PM2