Lead Penetration Tester & CHECK Team Lead (Hybrid Bristol)

CBS Butler; Rowberrow; Hybrid; GBP 80,000 - 100,000; Full time

Benefits offered by this job

Hybrid working

Company benefits package

Training & certification support

Job summary

CBS Butler is seeking a Lead Penetration Tester/ CHECK Team Leader to join our Offensive Security team in Bristol. This role blends hands-on testing with technical leadership across Defence, Government and critical national infrastructure in high-assurance environments.

You will lead engagements, mentor junior testers, and help shape service offerings while ensuring compliance with NCSC CHECK standards. Hybrid working (2 days onsite) and a strong salary package are on offer.

Qualifications

• Current Crest CHECK Team Leader (CTL) qualification is essential.
• Excellent hands-on penetration testing experience across infrastructure, applications, cloud or other complex environments.
• Experience planning, leading and delivering penetration testing engagements.
• Excellent technical report writing and the ability to communicate findings to technical and non-technical audiences.
• Strong stakeholder management and client-facing consulting skills.
• Good understanding of cyber security frameworks, standards and best practices.
• Experience with scripting or automation using Python, PowerShell, Bash or similar.
• Strong analytical and problem-solving skills.
• Ability to obtain SC Security Clearance, potentially progressing to higher levels of clearance.
• Willingness to travel to customer sites when required.

Responsibilities

• Lead and deliver penetration testing engagements across infrastructure, web apps, APIs, cloud, OT and more.
• Plan and scope testing engagements, ensuring alignment with CHECK standards.
• Provide technical leadership and quality assurance across penetration testing activities.
• Produce detailed technical and executive reports with remediation recommendations.
• Collaborate with customers to understand security requirements and deliver testing solutions.
• Mentor junior penetration testers and CHECK Team Members.
• Contribute to development of offensive security methodologies, tooling and service offerings.
• Stay updated with emerging threats and testing techniques.

Skills

CHECK CTL qualification

Penetration testing

Infrastructure & cloud testing

Technical leadership

Report writing

Stakeholder management

Scripting (Python)

Scripting (PowerShell)

Scripting (Bash)

Travel readiness

Tools

Python

PowerShell

Bash

Job description

CBS Butler is seeking a Lead Penetration Tester/ CHECK Team Leader to join our Offensive Security team in Bristol. This role blends hands-on testing with technical leadership across Defence, Government and critical national infrastructure in high-assurance environments.

You will lead engagements, mentor junior testers, and help shape service offerings while ensuring compliance with NCSC CHECK standards. Hybrid working (2 days onsite) and a strong salary package are on offer.