BDO Digital Offensive Security Manager in London

We are BDO, an accountancy and business advisory firm, providing the advice and solutions entrepreneurial organisations need to navigate today's changing world. We work with companies that are Britain's economic engine – ambitious, entrepreneurially-spirited and high growth businesses that fuel the economy - and directly advise the owners and management teams that lead them.

At our core, we believe that growth comes from exposure to diverse challenges. In this role, you will have the opportunity to work across a wide range of engagements, thanks to the trust and scale of our clients. You will get hands-on experience with web application and API testing, wireless assessments, internal infrastructure tests, mobile app security, red and purple team operations, physical intrusion testing, hardware analysis, and more. This variety allows our team to explore different domains, deepen existing strengths, and discover new areas of interest, all while solving real-world problems in live environments.

Our Digital Services are designed to enable organisations to leverage our innovative methodologies, technology, and highly experienced professionals to manage their business risks most effectively. We are a dynamic team of internal auditors, accountants, technology, and business transformation experts with disciplines in finance, risk, projects and change, cyber and digital, amongst others. Our extensive network and depth of experience mean we work in a highly client-centric way, focused on providing a collaborative, tailor-made advisory service.

We are looking for a skilled Manager to join our Offensive Security team. In this role, you will oversee sophisticated penetration testing and red team engagements and help drive the development of the offensive security practice.

Requirements:

• Strong certification in penetration testing such as OSCP (Offensive Security Certified Professional), CTM (Check Team Member), CRT (CREST Registered Tester) and OSWA (Offensive Security Web Assessor).
• Solid experience in offensive security—whether through professional penetration testing, red teaming, bug bounty work, capture-the-flag competitions, or personal research projects.
• Proven ability to deliver impactful client engagements, demonstrating both technical depth and a practical understanding of risk.
• Experience in performing digital forensics and incident response (DFIR) activities during an active engagement and/or management of a DFIR engagement.
• A degree in Cyber Security, Information Technology, or a related field.
• Strong leadership skills with the ability to manage and motivate a team.
• Excellent communication, collaboration and problem-solving skills especially when dealing with potential blockers or unexpected obstacles to delivery.
• A strategic mindset with a proactive approach to problem-solving.
• An active interest in the evolving security landscape, continuously staying up to date with new techniques, vulnerabilities, and research as well as contributing knowledge back to the team.

At BDO, we are committed to helping you achieve your personal and professional goals. We provide structured development frameworks, resources, and mentorship to support your growth—whether you are looking to deepen a specific skillset or broaden your expertise across domains. Our team culture emphasizes peer support, collaboration, and knowledge sharing on every project.

Mutual support and respect are one of BDO's core values and we are proud of our distinctive, people-centred culture. Our agile working framework helps us stay connected, bringing teams together where and when it counts so they can share ideas and help one another. At BDO, you will always have access to the people and resources you need to do your best work.

We help entrepreneurial businesses to succeed, fuelling the UK economy. Our success is powered by our people, which is why we are always finding new ways to invest in you. We shape the future together with openness and clarity, because we believe in empowering people to think creatively about how we can do things better.