Salary: £84,000 - 102,000 per year Requirements: Active, current Developed Vetting (DV) clearance - non-negotiable Demonstrable SME-level expertise in Cross Domain Solutions within a UK defence or government environment Deep understanding of HMG information assurance policy, JSP 440, JSP 604, and SPF requirements Hands-on experience with accredited CDS products (e.g. Nexor, Owl, Forcepoint, or equivalent) Strong understanding of data guard architectures, content inspection, and policy enforcement engines Familiarity with MOD/DSTL accreditation and risk management processes (RMADS, ISO 27001) Experience producing and reviewing security case documentation for high-classification systems Ability to engage credibly with senior stakeholders, accreditors, and government technical authorities Prior experience on UK defence programmes at SECRET or above is highly desirable Responsibilities: Acting as the programmes technical authority on all Cross Domain Solution matters Defining and owning CDS architecture, design patterns, and security controls Leading the evaluation, selection, and integration of accredited CDS products and technologies Working with security architects and accreditors to achieve and maintain system accreditation Providing SME input to risk assessments, HMG/MOD security reviews, and technical audits Developing and reviewing CDS-related security documentation (RMADS, SyOps, TRA) Advising on data guard design, content filtering, and information flow policy enforcement Liaising with NCSC, DSTL, and other government bodies as required by the programme Supporting transition and integration activity across classification boundaries Technologies: Flow JSP Security More: We are a globally recognized prime defence contractor based in Preston, Lancashire, and we are dedicated to delivering high-assurance programmes in the defence sector. This role offers an opportunity to work within a dynamic team, where your expertise will directly impact critical projects. We provide an engaging work environment and competitive remuneration of £700 - £850 a day for a duration of 12 months or more. last updated 10 week of 2026