Salary: £100,800 - 110,240 per year Requirements: Senior experience across systems, software, and infrastructure engineering Proven ability to operate as a technical authority at enterprise scale Strong understanding of system-of-systems design, integration, and failure modes Deep knowledge of architectural trade-offs and risk-based decision making Experience working across multiple suppliers and delivery models Experience in large-scale, mission-critical or safety-critical environments (desirable) Background in government, defence, or regulated industries (desirable) Familiarity with secure-by-design and defence-in-depth principles (desirable) Experience in hybrid Agile / Waterfall delivery environments (desirable) Responsibilities: Define and maintain the technical vision and engineering strategy Ensure all architectural decisions align with operational needs, security requirements, scalability, resilience, and long-term maintainability Maintain strong alignment between user needs, delivery constraints, and sustainable engineering outcomes Act as the system-level integrator across all domains Oversee dependencies and interfaces across applications, infrastructure, identity, networks, and external services Prevent siloed decision-making that could compromise overall system performance or resilience Provide independent technical assurance from early design through to live operations Ensure architectural decisions are evidence-based, proportionate to risk, and consistently applied Collaborate closely with assurance and quality teams without duplicating their function Set clear technical expectations for suppliers and delivery partners Review and assure technical designs and engineering outputs Challenge poor engineering practice where it introduces risk, while maintaining strong, constructive working relationships Ensure solutions are designed for real-world operation Champion non-functional requirements including resilience, availability, security, performance, usability, and recoverability Use live service insight to continuously improve engineering decisions Technologies: Architect Security More: We are seeking a Systems Engineer/Architect for a pivotal leadership role focused on end-to-end technical integrity and sustainable delivery of a major digital service. This position is located 2-3 days per week onsite at MOD Corsham and is offered as a 6-month contract with a day rate between £480 - £520 per day (Inside IR35). You will join a dynamic team dedicated to ensuring engineering excellence while balancing delivery demands. last updated 18 week of 2026