Senior Penetration Tester - CTM

Instil; Belfast; On-site; GBP 50,000 - 70,000; Full time

Benefits offered by this job

Discretionary annual performance bonus

Flexible working arrangements

Highly competitive pension scheme

Private healthcare

Employee Assistance Programme

Cycle-to-work scheme

35 days holiday

Job summary

A cybersecurity firm in Belfast is seeking a Senior Penetration Tester to deliver high-quality penetration testing across diverse client systems. The role requires at least 2 years of experience, proficiency in various testing methodologies, and current UK Security Clearance. Ideal candidates will have strong knowledge of cloud environments and tools such as BurpSuite and Nmap. The position offers competitive benefits including flexible working arrangements, a performance bonus, and a strong focus on professional development.

Qualifications

• Current UK Security Clearance required.
• 2+ years of penetration testing experience necessary.
• Strong experience with web application and network penetration testing methodologies.

Responsibilities

• Deliver high-quality penetration testing engagements across various domains.
• Identify and remediate security weaknesses in clients' systems.
• Mentor junior testers and contribute to methodological development.

Skills

CHECK Team Member (CTM) status

Current UK Security Clearance

At least 2+ years of penetration testing experience

Web application and network penetration testing methodologies

In‑depth knowledge of operating systems (Linux, Windows, Active Directory)

Familiarity with cloud environments

Proficiency with tools such as BurpSuite Pro, Nmap, Nessus, and Kali Linux

Knowledge of scripting languages (Python, Shell, etc.)

Job description

We are looking for a Senior Penetration Tester with CHECK to join our growing team. You will play a critical role in delivering high‑quality penetration testing engagements across infrastructure, cloud, web, and mobile applications for a diverse range of clients, including software, fintech, manufacturing, engineering, legal, and public sector organisations.

This is a hands‑on role where your expertise will help identify and remediate security weaknesses, while contributing to the development of our methodologies and mentoring junior testers. If you’re passionate about offensive security and want to work on varied, challenging projects in a supportive environment, we’d love to hear from you.

Essential Skills

• CHECK Team Member (CTM) status
• Current UK Security Clearance
• At least 2+ years of penetration testing experience
• Strong experience with web application and network penetration testing methodologies
• In‑depth knowledge of operating systems (Linux, Windows, Active Directory)
• Familiarity with cloud environments and ability to perform cloud security reviews
• Proficiency with tools such as BurpSuite Pro, Nmap, Nessus, and Kali Linux
• Knowledge of scripting languages (Python, Shell, etc.)

Nice‑to‑Have

• CHECK Team Lead (CTL) status (Infrastructure or Applications)
• Relevant certifications (OSCP, Cyber Scheme)
• Experience with Hack the Box or Capture the Flag simulations

Benefits

• Recognition that matters: A discretionary annual performance bonus that rewards your impact and contribution to our success
• Flexibility built in: Flexible working arrangements and summer hours
• Financial security: A highly competitive pension scheme with generous employer contributions, private healthcare, and life assurance
• Health & wellbeing: Employee Assistance Programme, mental health support, cycle‑to‑work scheme, and regular social events
• Time to recharge: 35 days holiday, enhanced maternity pay, and family‑first policies
• Learning never stops: From courses to certifications, we’ll invest in your development
• Community & culture: Opportunities to volunteer, give back, and be part of initiatives that make Instil truly inclusive and connected