National AI Awards 2025Discover AI's trailblazers! Join us to celebrate innovation and nominate industry leaders.

Nominate & Attend

Offensive Security Specialist - Penetration Tester

London
1 week ago
Create job alert

Role Summary:

Join our dynamic Offensive Security Team! As we expand, we are looking for a Pentester/Red Teamer who is enthusiastic about undertaking a range of security assessments, including penetration testing, red team exercises, vulnerability scanning, and physical access evaluations for our clients.

Key Responsibilities:

Client Engagement Management: Lead client projects, ensuring clear communication, timely delivery, and exceeding expectations. Act as the primary liaison, providing updates and guidance.
Security Assessment Execution: Conduct detailed security assessments, including penetration testing and vulnerability analysis. Systematically identify and document vulnerabilities across network, application, and physical layers. Prepare concise reports for both technical and non-technical stakeholders.
Red Team Challenges: Participate in red team simulations, encompassing social engineering attacks and advanced penetration tactics. Post-initial access, perform internal testing to escalate privileges and gain high-level access. Document methodologies and outcomes, providing actionable insights for enhancing security.

Technical Proficiencies:

Python/Scripting: Demonstrate a high level of proficiency in Python, essential for writing custom scripts to automate tasks, analyze data, and develop unique tools for penetration testing. This skill is crucial for tailoring attacks, parsing data, and creating efficient workflows in security assessments.
Linux/Windows Proficiency: Have a thorough understanding of Linux/Windows systems, which are commonly used in security environments. This includes navigating the command line, understanding file permissions, managing services, and using Linux/Windows-based security tools. Knowledge of Linux/Windows is vital for testing and exploiting Unix/Windows-based applications and servers.
Burp Suite Expertise: Exhibit expertise in using Burp Suite, a leading tool for web application security testing. This includes leveraging its various features for intercepting traffic, conducting automated scans, manipulating requests and responses, and identifying vulnerabilities in web applications.
Nmap and Enumeration Tools: Skilled in using Nmap for network scanning and enumeration. This involves not just running scans but interpreting results to identify open ports, services, and potential vulnerabilities. Familiarity with other enumeration tools that help in discovering and mapping network and system details is also important.
Active Directory Analysis/Impacket: Proficient in analyzing Active Directory environments using tools like Impacket. This includes understanding AD architecture, identifying misconfigurations, and exploiting them. Skills in leveraging Impacket for tasks like network relays, password spraying, and gaining elevated privileges are crucial for penetrating Windows environments.We're Seeking:

Qualifications: A degree in Computer Science, Engineering, Mathematics, or Physics.
Experience Level: Open to graduates/juniors and above. The more experience in red teaming, the better.
Skills: Exceptional problem-solving abilities, with a flair for thinking on your feet and tackling constantly evolving threats creatively.
Attributes: Motivated, passionate, determined, and an avid learner. We value self-starters with proven experience who are driven to learn.Communication: Strong interpersonal and communication skills are essential for effective team collaboration, which is a key aspect of our work culture

GCS is acting as an Employment Agency in relation to this vacancy

Related Jobs

View all jobs

Consultant - Cyber Security (Penetration Tester)

Security and Information Security Architect

Security and Information Security Architect (London Area)

Senior Cyber Security Architect

DevSecOps Engineer

Cyber Security Consultant

National AI Awards 2025

Subscribe to Future Tech Insights for the latest jobs & insights, direct to your inbox.

By subscribing, you agree to our privacy policy and terms of service.

Industry Insights

Discover insightful articles, industry insights, expert tips, and curated resources.

LinkedIn Profile Checklist for Cybersecurity Jobs: 10 Tweaks to Supercharge Recruiter Engagement

In the ever-evolving realm of cybersecurity, having a LinkedIn profile that reflects both your technical prowess and threat-hunting acumen is vital. Organisations are on the lookout for professionals skilled in penetration testing, incident response, security architecture and compliance. With hiring managers scanning dozens of profiles daily, your profile needs to not just rank in searches but convey your expertise in safeguarding digital assets. This step-by-step LinkedIn for cybersecurity jobs checklist offers ten practical tweaks to supercharge recruiter engagement. Whether you’re an aspiring security analyst, a seasoned penetration tester or a chief information security officer aiming for board-level roles, these actionable optimisations will sharpen your LinkedIn presence and position you as a top infosec candidate.

Part-Time Study Routes That Lead to Cyber Security Jobs: Evening Courses, Bootcamps & Online Masters

The frequency and sophistication of cyber-attacks have exploded in recent years, making cyber security one of the UK’s most in-demand skill sets. From safeguarding NHS patient data to defending FTSE 100 financial systems, organisations across sectors require qualified professionals—penetration testers, security analysts, incident responders and security architects—to protect critical infrastructure. Yet many professionals cannot pause their careers to upskill full time. Fortunately, an ecosystem of part-time learning pathways—evening courses, intensive bootcamps and flexible online master’s programmes—enables you to learn cyber security while working. This comprehensive guide explores every route: foundational CPD, immersive bootcamps, accredited online MScs, plus funding options, planning strategies and a real-world case study. Whether you’re an IT support technician, a software developer or a compliance manager aiming to pivot into security, you’ll discover how to build expertise at your own pace.

The Ultimate Assessment-Centre Survival Guide for Cyber Security Jobs in the UK

Assessment centres for cyber security positions in the UK are designed to mirror real-world threat landscapes and test both your technical acumen and soft skills under pressure. Across multiple stages—psychometric assessments, penetration testing exercises, incident response group tasks, case studies, interviews and even informal networking breaks—employers assess your ability to identify vulnerabilities, collaborate in high-stakes scenarios and communicate effectively. This guide walks you through each component, equipping you to stand out and secure your next role in cyber defence.