Senior Penetration Tester

Instil Newcastle Upon Tyne, England, United Kingdom

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.

• 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 Burp Suite Pro, Nmap, Nessus, and Kali Linux
• Knowledge of scripting languages (Python, Shell, etc.)

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

• Recognition That Matters:
  Discretionary annual performance bonus
• Flexibility Built In:
  Flexible working arrangements and summer hours
• Financial Security:
  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:
  Courses and certifications sponsored by Instil
• Community & Culture:
  Volunteering opportunities and inclusive initiatives

And that’s just the start, drop us a note to find out more.

Instil has been delivering world‑class software engineering and technology solutions for over 20 years, trusted by global brands to solve complex challenges and drive innovation. From modernising legacy systems to building cutting‑edge applications, we help our clients navigate an ever‑changing digital landscape with confidence and agility. We’re proud to be an award‑winning employer, reflecting how our people are at the heart of everything we do.

Recognised as a Great Place to Work® for three consecutive years and ranked in the Top 20 Best Workplaces in the UK for medium‑sized companies in 2024, Instil continues to make a difference.

Seniority level:
Mid‑Senior level |

Employment type:

Full‑time | Job function:
Information Technology | Industries:
Software Development