Penetration Tester (Mid/Senior)

Instil Software; Belfast; On-site; GBP 45,000 - 65,000; Full time

Job summary

A leading cybersecurity company seeks a Mid/Senior Penetration Tester in Belfast to join their team. This role includes conducting penetration tests and providing expert guidance to varied clients. Ideal candidates should have strong knowledge of security methodologies and relevant experience. The company promotes learning, offering certifications in the field.

Benefits

Competitive Salary & Annual Bonus

Hybrid Working

Flexible Working Hours

Summer Working Hours

35 Days Holiday

Life Assurance

Cycle to Work Scheme

Qualifications

• At least 2+ years of experience in penetration testing.
• Demonstrable skills in the Penetration Testing/Ethical Hacking field.
• Knowledge of Scripting Languages e.g. Python, Shell Scripting.

Responsibilities

• Conduct penetration tests and vulnerability assessments.
• Write reports outlining vulnerabilities and recommendations.
• Mentor junior penetration testers.

Skills

Penetration Testing

Ethical Hacking

Python

Linux

Windows

Active Directory

BurpSuite Pro

Nmap

Nessus

Kali Linux

Education

Relevant security certifications (e.g. OSCP, CREST, Cyber Scheme)

Job description

Client:

Instil Software

Location:

Belfast, United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

Job Reference:

5b820a6394cf

Job Views:

6

Posted:

12.07.2025

Expiry Date:

26.08.2025

Job Description:

At we specialise in providing human-focused security and penetration testing services for web applications, cloud infrastructure and mobile applications.

The Role

We are looking for a Mid / Senior Penetration Tester to join our dynamic team based in Belfast. As a Pen Tester, you will be part of the delivery team, conducting penetration tests and vulnerability assessments across a range of technologies and a wide range of customers including software, fintech, manufacturing, engineering, legal, and public sector. Your insights will be crucial in identifying security weaknesses and helping clients fortify their systems.

We offer varied, challenging work in a supportive environment where you will find yourself constantly evolving and learning, whilst studying towards CREST (CPSA/CRT/CCT) or Cyber Scheme (CSTM/CSTL) certifications. If this sounds like you, we'd love to hear from you.

Location Requirements

This role is based in Belfast and may require some onsite work with clients. Therefore, candidates should be located in Northern Ireland.

• Competitive Salary & Annual Bonus
• Hybrid Working
• Flexible Working Hours
• Summer Working Hours
• 35 Days Holiday
• Life Assurance
• Cycle to Work Scheme

Day to Day

• Probe & exploit security vulnerabilities in client's Infrastructure/cloud, Web Applications and Mobile Applications using a variety of penetration tests.
• Write detailed reports outlining vulnerabilities and providing actionable recommendations.
• Collaborate with clients during kick-off and discovery sessions, providing expert advice.
• Stay current with the latest security threats, vulnerabilities, and trends.
• Research offensive security techniques to assess and validate infrastructure and technologies, including cloud-based systems continuously incorporating new techniques into the team's methodology.
• Automate repetitive tasks by developing scripts to streamline testing processes.
• Mentor junior penetration testers and contribute to their professional development.
• Play a key role in enhancing existing tools, methodologies, and reports.
• Support pre-sales efforts by acting as a penetration testing subject-matter expert.
• Communicating Security Vulnerabilities to both technical and non-technical stakeholders.
• Contribute to internal collaborative development or knowledge sharing initiative.

Need to Have

• At least 2+ years of experience in penetration testing.
• Demonstrable skills in the Penetration Testing/Ethical Hacking field.
• In-depth knowledge of various web technologies, operating systems, particularly Linux, Windows, and Active Directory.
• Knowledge of Scripting Languages e.g. Python, Shell Scripting etc.
• Strong experience with web application and network pen testing methodologies.
• Proficiency in using penetration testing tools such as BurpSuite Pro, Nmap, and Nessus.
• Familiarity with Kali Linux and the associated penetration testing tool suite.
• Experience in penetration testing simulations like Hack the Box or Capture the Flag.
• Excellent communication and technical report writing skills.
• Eligibility to live and work in the UK (please note we are unable to provide VISA sponsorship).

At we specialise in providing human-focused security and penetration testing services for web applications, cloud infrastructure and mobile applications.

The Role

We are looking for a Mid / Senior Penetration Tester to join our dynamic team based in Belfast. As a Pen Tester, you will be part of the delivery team, conducting penetration tests and vulnerability assessments across a range of technologies and a wide range of customers including software, fintech, manufacturing, engineering, legal, and public sector. Your insights will be crucial in identifying security weaknesses and helping clients fortify their systems.

We offer varied, challenging work in a supportive environment where you will find yourself constantly evolving and learning, whilst studying towards CREST (CPSA/CRT/CCT) or Cyber Scheme (CSTM/CSTL) certifications. If this sounds like you, we'd love to hear from you.

Location Requirements

This role is based in Belfast and may require some onsite work with clients. Therefore, candidates should be located in Northern Ireland.

Benefits

Competitive Salary & Annual Bonus

Hybrid Working

Flexible Working Hours

Summer Working Hours

35 Days Holiday

Private Pension (8% Employer, 5% Employee)

Private Healthcare

Life Assurance

Cycle to Work Scheme

Day to Day

Probe & exploit security vulnerabilities in client's Infrastructure/cloud, Web Applications and Mobile Applications using a variety of penetration tests.

Write detailed reports outlining vulnerabilities and providing actionable recommendations.

Collaborate with clients during kick-off and discovery sessions, providing expert advice.

Stay current with the latest security threats, vulnerabilities, and trends.

Research offensive security techniques to assess and validate infrastructure and technologies, including cloud-based systems continuously incorporating new techniques into the team's methodology.

Automate repetitive tasks by developing scripts to streamline testing processes.

Mentor junior penetration testers and contribute to their professional development.

Play a key role in enhancing existing tools, methodologies, and reports.

Support pre-sales efforts by acting as a penetration testing subject-matter expert.

Communicating Security Vulnerabilities to both technical and non-technical stakeholders.

Contribute to internal collaborative development or knowledge sharing initiative.

Need to Have

At least 2+ years of experience in penetration testing.

Demonstrable skills in the Penetration Testing/Ethical Hacking field.

In-depth knowledge of various web technologies, operating systems, particularly Linux, Windows, and Active Directory.

Knowledge of Scripting Languages e.g. Python, Shell Scripting etc.

Strong experience with web application and network pen testing methodologies.

Proficiency in using penetration testing tools such as BurpSuite Pro, Nmap, and Nessus.

Familiarity with Kali Linux and the associated penetration testing tool suite.

Experience in penetration testing simulations like Hack the Box or Capture the Flag.

Excellent communication and technical report writing skills.

Eligibility to live and work in the UK (please note we are unable to provide VISA sponsorship).

Nice to Have

Relevant security certifications (e.g. OSCP, CREST, Cyber Scheme.)

UK SC clearance

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Created on 12/07/2025 by TN United Kingdom