SC Systems Architect

Job Title: SC Cleared Systems Architect (Military Messaging Solution)
Location: Corsham
Duration: 12 months
Rate: Up to £500 per day via an approved umbrella company
Must be willing and eligible to go through the SC clearance process

Our Client is hiring for a reputed client to support the UK Strategic Command with expert system architecture, technical assurance, and migration design services for a secure multi-domain Military Messaging Solution (MMS). If you enjoy solving complex technical challenges while keeping governance and security front and centre, this is a role where your architecture decisions genuinely matter.

What you'll be doing:

Own technical design accountability for the MMS target architecture and ensure strong architectural governance
Develop and assure high-level and low-level designs for secure, multi-domain message routing across distinct security domains
Verify system topologies align with standard protocols such as STANAG 4406, STANAG 5066, ACP127, and DOI 103(s)
Support information assurance mapping, including security boundaries, cross-domain solutions, guard gateways and PKI token structures to meet defence accreditation needs
Lead legacy modernisation and IP migration from synchronous serial infrastructure to IP-routed network environments
Create obsolescence roadmaps for legacy cryptographic devices and message switches, including bridging architectures to maintain live service continuity
Produce reference architectures for integration with CCEB (5-Eyes) and NATO multi-national messaging gateways
Standardise configurations to securely onboard maritime endpoints (including mobile naval units and tactical nodes)
Act as an independent technical advisor in project updates, stakeholder workshops, and maintain clear, timely communication

What you'll bring:

Strong system architecture experience spanning HLD/LLD, routing and topology assurance
Confidence working within MOD-aligned standards and frameworks, including JSP604/453
Practical understanding of interoperability engineering and secure integration patterns
The ability to communicate architecture decisions clearly to stakeholders and workshops
A security-focused mindset, working within OFFICIAL and OFFICIAL-SENSITIVE classifications (with secure access)If you're SC cleared and ready to lead mission-critical architectural governance and modernisation, apply now and take the next step with a team that values expertise, clarity and delivery.

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