BDO Digital Offensive Security Manager in London

We’re BDO. An accountancy and business advisory firm, providing the advice and solutions entrepreneurial organisations need to navigate today’s changing world. We work with the 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. No two projects are quite the same, and that’s exactly how we like it. 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.

Manage risk for our clients to make them stronger for the future. 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. Working at BDO offers curious‑minded people excellent exposure to all aspects of business strategy, operations and more.

We’re 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. Our team helps clients manage their business‑critical threats, such as cyber events, and build resilient businesses capable of responding to internal and external events which may interrupt their operations. Being known for exceptional client service in our chosen markets, we put innovation and agility at the heart of everything we do.

This is your chance to join a fast‑paced, growing team and help shape the future of Digital at BDO.

We’ll Help You Succeed. Leading organisations trust us because of the quality of our advice. That quality grows from a thorough understanding of their business, and that understanding comes from working closely with them and building long‑lasting relationships. You’ll be someone who is both comfortable working proactively and managing your own tasks, as well as confident collaborating with others and communicating regularly with senior managers, directors, and BDO’s partners to help businesses effectively. You’ll be encouraged to identify and draw attention to opportunities for enhancing our delivery and providing additional services to organisations we work with.

Role Overview: 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.

Responsibilities:

• Oversee and lead complex penetration testing and red team engagements.
• Drive the growth and development of BDO’s offensive security practice.
• Collaborate with senior stakeholders to shape client solutions and provide expert advice.
• Mentor and motivate a team of security professionals.
• Identify opportunities for service expansion and enhancement.

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) or better if you have advanced certifications such as OSEP (Offensive Security Experienced Penetration Tester), CCSAM (CREST Certified Simulated Attack Manager) and CTL (Check Team Leader).
• 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 managing 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.

Be Yourself: It's at the core of the company’s and team’s vision. You’ll be able to truly be yourself; we’ll recognise and value you for who you are and celebrate and reward your contributions to the business. We’re committed to agile working, and we offer every colleague the opportunity to work in ways that suit them, their teams, and the tasks at hand.

At BDO, we’re committed to helping you achieve your personal and professional goals. We provide structured development frameworks, resources, and mentorship to support your growth—whether you’re looking to deepen a specific skillset or broaden your expertise across domains. We’ll align your client engagements with your learning objectives, giving you the chance to apply new skills, explore areas of interest, and gain practical experience. You won’t be navigating this alone—our team culture emphasizes peer support, collaboration, and knowledge sharing on every project.

We’re in It Together: Mutual support and respect are one of BDO’s core values and we’re proud of our distinctive, people‑centred culture. From informal success conversations to formal mentoring and coaching, we’ll support you at every stage in your career, whatever your personal and professional needs. 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’ll always have access to the people and resources you need to do your best work.

We know that collaboration is the key to creating value for the companies we work with and satisfying experiences for our colleagues, so we’ve invested in state‑of‑the‑art collaboration spaces in our offices. BDO’s people represent a wealth of knowledge and expertise, and we’ll encourage you to build your network, work alongside others, and share your skills and experiences. With a range of multidisciplinary events and dedicated resources, you’ll never stop learning at BDO.

We’re Looking Forward to the Future: At BDO, we help entrepreneurial businesses to succeed, fuelling the UK economy. Our success is powered by our people, which is why we’re always finding new ways to invest in you. Across the UK thousands of unique minds continue to come together to help companies we work with to achieve their ambitions. We’ve got a clear purpose, and we’re confident in our future, because we’re adapting and evolving to build on our strengths, ensuring we continue to find the right combination of global reach, integrity and expertise. 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.