SC Systems Architect

Experis (Austria); Corsham; On-site; GBP 90,000 - 115,000; Full time

Job summary

Experis is hiring a SC Cleared Systems Architect for a 12-month assignment in Corsham. The role focuses on expert system architecture for a secure Military Messaging Solution, including governance and secure design across multiple domains.

You will develop high-/low-level designs, ensure alignment with defence standards, and lead migration and modernization efforts to support live service continuity.

Qualifications

• Strong system architecture experience spanning high- and low-level designs.
• Familiar with MOD-aligned standards and frameworks.
• Understanding of interoperability engineering and secure integration patterns.
• Ability to communicate architecture decisions clearly to stakeholders.
• Security-focused mindset with OFFICIAL classifications experience

Responsibilities

• Own technical design accountability for the MMS target architecture and governance.
• Develop high- and low-level designs for secure, multi-domain message routing across domains.
• Verify topologies align with STANAG 4406, STANAG 5066, ACP127 and DOI 103(s).
• Map information assurance, including security boundaries, cross-domain solutions, and PKI structures.
• Lead legacy modernization and IP migration from serial to IP-based networks.
• Create obsolescence roadmaps for legacy crypto devices and message switches.
• Produce reference architectures for CCEB (5-Eyes) and NATO gateways.
• Standardize configurations to onboard maritime endpoints securely.
• Act as independent technical advisor in updates and workshops

Skills

System architecture

HLD/LLD

MOD standards

Interoperability engineering

Stakeholder communication

Job description

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)

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