Senior Cyber Security Specialist – Public Key Infrastructure Operations

Install, configure and maintain the organisation-wide public key infrastructure and its dependent virtualised platform, networking and hardware
Run the directory service, supporting web service and dedicated databases
Own certificate status checking and time stamping
Deploy, integrate and manage the card management system
Support smart card enrolment and certificate issuance
Manage hardware security modules, including firmware upgrades
Analyse certificate authority logs, troubleshoot alarms and errors, and monitor suspicious activity
Maintain daily operations, backup and restore, and verify restorations
Provide second- and third-line technical support to operating authorities and service customers
Design new components and write associated standard operating procedures
Document new services and produce installation guides, configuration baselines, test plans and reports, and hardening guides
Investigate network faults, security incidents and performance problems and implement improvements
Support integration of security tooling into current and future environments
Conduct testing, validation and acceptance
Work with project managers, engineers, architects and operational stakeholders
Hand over services to operations and provide knowledge transfer
Work outside office hours when incidents or operational requirements require it

Requirements

• At least five years in cyber security or a closely related field
• Deep knowledge of modern networking and internet protocols, including their security
• Working competence configuring routers and switches
• Hands-on administration of Windows Server, Red Hat Enterprise Linux and VMware
• Experience with backup and restore
• Practical scripting in Python and PowerShell
• Automation with Ansible
• Familiarity with SSL, TLS and OpenSSL
• SQL database administration experience
• Five years or more across network installation, testing and integration; network support and performance monitoring; migration projects; and fault diagnosis to agreed procedures
• Configuration, maintenance and repair of storage networks, servers, tape libraries and virtualisation platforms
• Experience with systems installation and decommissioning, quality plans and method statements, integration builds and test specifications, configuration management and problem management
• Recent work with Juniper, Palo Alto and RSA NetWitness
• Experience designing and configuring infrastructure elements inside projects, including routing, switching and virtualisation
• Record of delivering into industry, government or military organisations, including deployments to operational areas
• Ability to work alone or coordinate an industry team
• Strong professional English, written and spoken
• Genuine technical writing ability
• Willingness to work outside office hours when required
• Experience supporting a military or governmental organisation is nice to have
• Security clearance required, as stated in the role title

Core Competencies

Demonstrates extensive experience in cyber security, with a strong focus on managing public key infrastructure, network protocols, and security tooling integration. Proficient in technical support, documentation, and operational handover processes, ensuring seamless service delivery.

Highest-signal resume keywords

• Public Key Infrastructure Management
• Windows Server Administration
• Python Scripting
• Network Installation and Support
• Security Clearance

Hard Skills

• Cyber Security
• Networking Protocols
• Router and Switch Configuration
• SQL Database Administration
• Backup and Restore
• Ansible Automation
• SSL/TLS Management
• Virtualisation Platforms
• Firmware Upgrades
• Fault Diagnosis

Soft Skills

• Technical Writing
• Communication
• Team Coordination
• Problem Solving
• Ability to Work Independently

Certifications & Qualifications

• Security Clearance

Industry Keywords

• Government
• Military
• Operational Areas
• Service Delivery
• Integration Builds

Tools & Technologies

• Red Hat Enterprise Linux
• VMware
• Juniper
• Palo Alto
• RSA NetWitness