Senior Platform Engineer

In this role you will lead the design, build, and support of secure platforms that underpin defence and government services. You will work within the Cyber & Security Solutions Division, collaborating with cross-functional teams to deliver reliable, compliant platforms in hybrid environments. You’ll balance hands-on engineering with technical leadership, guiding teams through architecture and operational delivery. This is a mission-driven, fast-paced opportunity to shape secure, enterprise-scale platforms that support critical national security outcomes.

• Generous leave with up to 12 flexi-days
• Pension scheme with up to 15% employer contribution
• Mental health support and financial advice
• Access to 4,000+ online courses (Coursera and LinkedIn Learning)
• Flexible benefits including private healthcare, lifestyle discounts, gym memberships
• Flexible working hours and hybrid working options

• Lead the design, build, and support of secure on-premise and hybrid platforms
• Own engineering delivery for one or more work packages including planning, estimation, execution, and reporting
• Develop and review system architectures, low-level designs, and technical documentation
• Integrate and test platform components ensuring security and performance compliance
• Provide mentoring and technical leadership to Platform Engineers and Technicians
• Collaborate with stakeholders, project teams, and customers to ensure solutions meet requirements
• Drive continuous improvement and contribute to internal engineering standards

• Strong experience delivering and supporting complex platforms
• Ability to balance hands-on engineering with leadership and mentoring
• Confidence to own solutions and represent engineering in technical discussions
• Windows and Linux OS administration and support
• Virtualised infrastructure operation and maintenance (VMware / Hyper-V)
• Operational support of platform services (PAM, PKI, cross-domain solutions) in live environments
• Platform administration including patching, upgrades, configuration, and account management
• Monitoring, alerting, and incident response for platform services
• Incident and problem management with root cause analysis
• Networking concepts (TCP/IP, DNS, DHCP, firewalls)
• Automation and scripting (PowerShell, Bash, Python)
• Knowledge of cyber security controls and accreditation requirements
• Experience supporting systems across the engineering lifecycle (transition into service, run, improvement)
• Delivery within secure/enterprise/defence environments

• Mentoring and technical leadership
• Collaborative, cross-functional communication
• Problem-solving mindset in high-pressure environments
• Cyber security controls and accreditation know-how
• Automation of operational tasks and scripting
• Experience with monitoring/alerting tools and SIEM