Senior Pen Tester

Senior Pen Tester

London Full-Time 45000 - 57500 £ / year (est.) Home office (partial)
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At a Glance

  • Tasks: Lead penetration tests and red team engagements to uncover vulnerabilities.
  • Company: LT Harper is a dynamic recruitment firm focused on cyber security.
  • Benefits: Flexible work options, competitive salary, and opportunities for mentorship.
  • Why this job: Make a real impact in cyber security while working with cutting-edge tools and techniques.
  • Qualifications: Must have offensive security certifications and strong experience in ethical hacking.
  • Other info: This role is ideal for UK residents looking to advance their careers in a collaborative environment.

The predicted salary is between 45000 - 57500 £ per year.

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LT Harper – Cyber Security Recruitment provided pay range

This range is provided by LT Harper – Cyber Security Recruitment. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

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Direct message the job poster from LT Harper – Cyber Security Recruitment

Head of Permanent Recruitment EMEA | Providing tailored support in the ever-evolving world of cyber security. Covering GRC, OffSec, SecOps & Security…

Senior Offensive Security Penetration Tester

Location – 1 or 2 days / wk London

Salary – £45K – 57,5K

Sorry – Must be UK Residents

You’ll lead penetration tests and red team engagements across a range of environments, helping clients uncover vulnerabilities, manage cyber threats, and build resilience.

This is a hands-on technical role with real impact. You’ll shape and deliver tailored testing engagements, mentor junior team members, and stay ahead of the evolving threat landscape by implementing the latest techniques, tools, and methodologies.

What you’ll do:

  • Plan and execute advanced penetration tests and red team exercises
  • Tailor assessments to client needs across applications, infrastructure, and physical environments
  • Produce clear, actionable reports for both technical and non-technical audiences
  • Stay up to date with new attack techniques and contribute to internal tooling

What we’re looking for:

  • Certifications: OSCP, CRT, OSWA, CTM, OSEP.
  • Strong experience in offensive security, red teaming, or ethical hacking
  • Deep understanding of networks, applications, and common vulnerabilities
  • Skilled with tools like Burp Suite, Metasploit, Cobalt Strike, or custom-built solutions
  • Proficient in Python, PowerShell, Bash or similar scripting languages
  • A practical, problem-solving mindset and strong communication skills

We value authenticity, curiosity, and collaboration. Work flexibly, be yourself, and help shape a forward-thinking, agile security team.

Apply here for the Senior Offensive Security Penetration Tester role, or contact

Seniority level

  • Seniority level

    Mid-Senior level

Employment type

  • Employment type

    Full-time

Job function

  • Job function

    Information Technology

  • Industries

    Security and Investigations and Computer and Network Security

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Senior Pen Tester employer: LT Harper - Cyber Security Recruitment

At LT Harper, we pride ourselves on being an exceptional employer in the cyber security sector, offering a dynamic work culture that fosters authenticity, curiosity, and collaboration. As a Senior Pen Tester, you'll not only lead impactful penetration tests but also have the opportunity to mentor junior team members and stay at the forefront of the evolving threat landscape. With flexible working arrangements in London and a commitment to employee growth, we provide a rewarding environment for those looking to make a meaningful contribution to cyber security.
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Contact Detail:

LT Harper - Cyber Security Recruitment Recruiting Team

StudySmarter Expert Advice 🤫

We think this is how you could land Senior Pen Tester

✨Tip Number 1

Network with professionals in the cyber security field, especially those who are already working as penetration testers. Attend industry events, webinars, or local meetups to connect with potential colleagues and learn about the latest trends and techniques.

✨Tip Number 2

Stay updated on the latest vulnerabilities and attack techniques by following relevant blogs, forums, and social media channels. This knowledge will not only help you in interviews but also demonstrate your commitment to staying ahead in the field.

✨Tip Number 3

Consider contributing to open-source projects or creating your own tools related to penetration testing. This hands-on experience can showcase your skills and passion for offensive security, making you a more attractive candidate.

✨Tip Number 4

Prepare for technical interviews by practising common penetration testing scenarios and challenges. Use platforms like Hack The Box or TryHackMe to sharpen your skills and gain practical experience that you can discuss during your interview.

We think you need these skills to ace Senior Pen Tester

Advanced Penetration Testing
Red Team Engagements
Vulnerability Assessment
Cyber Threat Management
Technical Report Writing
Network Security
Application Security
Physical Security Assessments
Burp Suite
Metasploit
Cobalt Strike
Python Scripting
PowerShell Scripting
Bash Scripting
Problem-Solving Skills
Strong Communication Skills
Up-to-date with Attack Techniques
Mentoring Junior Team Members
Custom Tool Development

Some tips for your application 🫡

Tailor Your CV: Make sure your CV highlights your experience in offensive security, red teaming, and ethical hacking. Include specific examples of penetration tests you've led and the tools you've used, such as Burp Suite or Metasploit.

Craft a Strong Cover Letter: In your cover letter, express your passion for cybersecurity and how your skills align with the role. Mention your certifications like OSCP or CRT, and explain how you can contribute to the team’s success.

Showcase Technical Skills: Clearly outline your proficiency in scripting languages like Python or PowerShell. Provide examples of how you've used these skills in past projects or engagements to solve complex problems.

Highlight Soft Skills: Don’t forget to mention your communication skills and ability to mentor junior team members. These are crucial for the role, so provide examples of how you've effectively communicated technical information to non-technical audiences.

How to prepare for a job interview at LT Harper - Cyber Security Recruitment

✨Showcase Your Technical Skills

As a Senior Pen Tester, it's crucial to demonstrate your technical expertise. Be prepared to discuss specific tools like Burp Suite and Metasploit, and share examples of how you've used them in past projects.

✨Prepare for Scenario-Based Questions

Expect scenario-based questions that assess your problem-solving abilities. Think about how you would approach different penetration testing situations and be ready to explain your thought process clearly.

✨Highlight Your Mentoring Experience

Since the role involves mentoring junior team members, be sure to mention any previous experience you have in training or guiding others. Share specific examples of how you've helped others grow in their skills.

✨Stay Updated on Cyber Threats

The cyber threat landscape is always evolving. Show your passion for the field by discussing recent trends or attack techniques you've researched. This will demonstrate your commitment to staying ahead in the industry.

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