Salary
£53,267 to £62,599, depending on skills and experience. This role offers a specialist capability‑based pay approach, designed to recognise and reward your cyber technical expertise. Following an assessment of your skills and experience at interview, you may be eligible for an additional skills payment, which could increase your salary to up to £62,599. To maintain a higher salary within this range, you’ll be supported to demonstrate and accredit your skills against our Cyber Technical Framework within your first year.
Flexible Working
We support a range of flexible working arrangements including compressed hours, flexible start and finish times and part‑time working where possible. Due to the sensitive nature of the role, this position is office‑based and home or remote working is not possible.
About us
MI5 keeps the country safe from serious threats like terrorism and attempts by states to harm the UK, its people and way of life. We carry out investigations by obtaining, analysing, and assessing intelligence, and then work with a range of partners including MI6 and GCHQ to disrupt these threats. Through our protective security arm, we provide advice and guidance to government, businesses and other organisations about how to keep themselves safe. A role in MI5 means you’ll do unique and challenging work in a supportive and encouraging environment, making a real difference to UK national security.
The role
As a Lead Cyber Research Engineer, you’ll play a central role in identifying vulnerabilities, understanding how systems can be exploited and developing practical ways to defend them. Combining hands‑on engineering with deep security expertise, you’ll help shape how cyber threats are understood, tested and mitigated across a complex and evolving technology landscape.
Working in a highly collaborative environment, you’ll tackle challenging security problems through a mix of research, experimentation and engineering. This could involve analysing attack techniques, reverse engineering software, testing systems under real‑world conditions or building bespoke tools to uncover and demonstrate vulnerabilities. The work is varied and often fast‑moving, requiring both technical depth and creative problem‑solving.
You’ll contribute to the development of new security capabilities, working closely with engineers, researchers and stakeholders to ensure solutions are effective, scalable and usable. Writing code, building tooling and creating repeatable processes will form a core part of the role, helping to improve both efficiency and impact.
As a lead, you’ll provide technical direction within your team – guiding approaches, shaping solutions and supporting others to deliver high‑quality work. Mentoring and knowledge sharing are central, helping to develop capability and promote strong engineering and security practices, without the requirement for formal line management.
Operating across teams, you’ll influence how security is approached more broadly – working with others to strengthen resilience, improve understanding of risk and ensure systems are robust against evolving threats.
About you
You’ll bring strong technical experience across cyber security and software or systems engineering, with the ability to understand how technologies work at a deep level and how they can be exploited. This might come from areas such as security research, reverse engineering, vulnerability discovery, systems programming or working with operating systems and networks.
You’ll be confident writing code across a range of languages (for example Python, Java or C/C++), and using this to test, prototype or build tools. You have a solid understanding of how systems communicate and operate, alongside practical experience of investigating real‑world problems, identifying vulnerabilities and developing effective solutions.
You think analytically and approach problems with curiosity, using experimentation and research to explore how systems behave under different conditions. Just as importantly, you can communicate your findings clearly – whether through written outputs, presentations or working directly with others to explain risks and recommendations.
You enjoy working collaboratively, sharing knowledge and supporting others to develop. While no formal leadership experience is required, you’ll be comfortable guiding others, contributing to technical direction and helping raise standards across a team.
Training and Development
You’ll benefit from a well‑established and flexible development programme designed to support both your technical depth and leadership capability. From the outset, you’ll receive a structured induction within your team, alongside wider familiarisation with the broader organisation and its technical landscape.
Ongoing development is a core part of the role. You’ll have access to a wide range of learning opportunities, from self‑directed research and development days through to formal external training and industry‑recognised certifications, aligned to your areas of interest and business need. This could include areas such as cloud technologies, networking, systems engineering or specialist security disciplines like reverse engineering and forensics.
You’ll also be supported to attend and contribute to internal and external conferences, sharing knowledge and staying connected to developments in the wider cyber security community.
Learning is embedded in the day‑to‑day – through hands‑on problem solving, collaboration and mentoring others. You’ll continue to grow your own expertise while also helping develop those around you, strengthening capability across the team over time.
Rewards and Benefits
Starting salary of £53,267 to £62,599 plus other benefits including:
- 25 Days Annual Leave automatically rising to 30 days after 5 years’ service, and an additional 10.5 days public and privilege holidays
- Opportunities to be recognised through our employee performance scheme
- Dedicated development budget
- Interest‑free season ticket loan
- Cycle to work scheme
- Facilities such as a gym, restaurant, and on‑site coffee bars (at some locations)
- Paid parental and adoption leave
Equal Opportunities
At MI5 diversity and inclusion are critical to our mission. To protect the UK, we need a truly diverse workforce that reflects the society we serve. This includes diversity in every sense of the word: those with different backgrounds, ages, ethnicities, gender identities, sexual orientations, ways of thinking and those with disabilities or neurodivergent conditions. We therefore welcome and encourage applications from everyone, including those from groups that are under‑represented in our workforce such as women, those from an ethnic minority background, people with disabilities and those from low socio‑economic backgrounds.
We’re Disability Confident
MI5 is proud to have achieved Leader status within the Department for Work and Pensions Disability Confident scheme. This is aimed at encouraging employers to think differently about disability and take action to improve how they recruit, retain, and develop disabled people. Being Disability Confident, we aim to offer a fair and proportionate number of person‑to‑person interviews to any candidate who self‑identifies as disabled and meets the essential criteria for the role. To secure an interview for this vacancy, the essential criteria (in order of application process) are:
- Reach the minimum pass mark for the online Situational Judgement Test (SJT)
- Developed knowledge of programming in high and low‑level languages
- Demonstrate experience in security research, reverse engineering, or operating system internals and a knowledge of networking and protocols
There is a wide range of extra support available throughout the recruitment process to enable you to do your best. Please visit our website for information on reasonable adjustments we can offer.
Location
The role is based in Central London. Candidates must live within a commutable distance. We do not offer relocation costs, but we provide reasonable reimbursement of travel costs for candidates attending in‑person appointments during the recruitment and vetting process.
#J-18808-Ljbffr…