About CACI

From our headquarters in London, we’re busy empowering organisations to make bold, strategic moves with the power of data and technology. Founded in 1975, our operations take place from multiple offices across the UK, Europe and India with over 1600 Full time employees and an annual turnover of £179m.

Our expertise spans industries, from retail and education to public sector and transport - delivering intelligent solutions that drive progress and create measurable impact. Whether it’s business intelligence, customer marketing, cloud infrastructure, cybersecurity, critical national infrastructure or data management, our approach is never one-size-fits-all.

We don’t just deliver solutions; we build for the tomorrow’s world, all while fostering a culture that allows employees to be their authentic selves and succeed in their careers.

About Network Services

CACI Network Services is a rapidly expanding specialist IT and Networks consultancy offering a wide variety of opportunities to work within challenging and exciting environments with our major clients in Global Media, Banking, Government, Telecoms & Utilities

Key responsibilities

• HS and LS Voice and Video telephony platforms.
• Partner Connectivity across the UK and overseas
• Underlying infrastructure to support UC Applications
• Develop additional UC skills to aid in the support of other UC Team Collaboration
• Tools and Audio-Visual and Managed Events capability to help create a multidisciplinary team.
• Hardware installation/configuration
• Infrastructure support - Flexpod, NettApps

Other responsibilities could include:

• Faults and service requests
• Technical escalations
• Contribute to the Internal monitoring and management tools (Grafana, Splunk and python based tools, Ansible)

Core skills, knowledge and experience required

Network Infrastructure

o LAN/WAN fundamentals, QoS for video and voice traffic.

o VLAN design, IP Addressing

o Secure device onboarding and certificate management.

• Firewall administration (Cisco ASA/Firepower, Palo Alto, Fortinet)

Unified Communications Platforms

o Cisco UC products

• Cisco Unified Communications Manager (CUCM), Cisco Jabber, Cisco Unity Connection, Cisco Expressway, Cisco Meeting Server

o Webex Control Hub administration.

o SIP protocol understanding.

o Interoperability and integration with Microsoft 365 or other UC tools.

Servers & Storage

o Physical and virtual server installation, configuration, and support (Windows Server, Linux distributions).

o Expertise in virtualisation platforms (VMware vSphere)

o Storage provisioning, replication, and backup solutions.

o Cisco UCS, Hyperflex, FlexPOD

o Netapp

Infrastructure Automation & Monitoring

o Scripting and automation

o Infrastructure as Code (IaC) experience (Terraform, Ansible).

o Splunk, Grafana

Video Conferencing Systems

o Deploy, configure, and troubleshoot Cisco VTC endpoints (Room Kits, Webex Boards, SX/MX series, Desk series).

o Knowledge of Zoom Rooms, Microsoft Teams Rooms, and interoperability gateways.

Cloud Infrastructure

o Amazon Web Services (AWS) architecture and management.

o Hybrid cloud deployments & integration with on-premise systems.

o Cloud networking, security groups, and resource optimisation.

Expected behaviors

We have a structured performance management framework which measures continual attainment against key personal behaviours. We believe this is an important part of our success and culture. Joining as a team member we expect you to act as a role model and exemplar against these behaviours which are to be:

• Proactive
• Adaptable
• Flexible
• A team player
• Reliable

Flexibility

The key to our success is our teamwork and collaboration. We take a hybrid approach - working remotely and coming into the office depending on the business demand and collaboration required as part of the delivery process.

Equal opportunities

CACI is proud to be an equal employer. Embracing the diversity of our people, we are on a journey to build a truly inclusive work environment where no one is treated less favorably due to ethnic origin, age, gender, veteran status, religion or belief, sexual orientation, marital status, and disability or health condition, actively working to prevent discrimination.

As a Disability Confident employer, we will:

• Provide reasonable adjustments in the recruitment process where requested (contact a member of the recruitment team to discuss individual requirements further).
• Offer people with health conditions and disabilities, meeting the minimum criteria for a role, an interview.

Our people are unique, and we encourage, and support them, to be confident in contributing to our inclusion journey.

Site Reliability Engineer (SRE) - Defence / National Security - £75k - Farnborough - Hybrid

A permanent opportunity for an experienced Site Reliability Engineer who enjoys building secure, automated, and highly reliable platforms. This role sits within a defence and national security environment, working on modern infrastructure where automation, resilience, and secure-by-design principles are fundamental.

You’ll work closely with platform engineers, infrastructure teams, and operational stakeholders to take requirements from early design and proof-of-concept through to production. The role blends hands-on engineering with technical design, offering real influence over tooling, standards, and DevOps ways of working. It suits someone curious, detail-oriented, and comfortable working in complex, regulated environments.

What you’ll be doing

Designing, delivering, upgrading, and maintaining core platforms, services, and automations

Building and improving monitoring, alerting, and observability platforms

Designing secure infrastructure using automation-first approaches

Creating and productionising proofs of concept for new tools and technologies

Diagnosing and resolving performance, reliability, and availability issues

Supporting architecture, documentation, and non-functional requirements

Mentoring engineers and helping improve DevOps and SRE practices

Essential experience

Strong experience with Linux (Ubuntu) and Windows Server environments

Hands-on scripting skills (Bash, Python, PowerShell or similar)

Proven experience with automation and DevOps tooling (Ansible, Terraform, CI/CD, Git)

Experience working with Azure or similar cloud platforms

Solid understanding of infrastructure reliability, monitoring, and incident response

Strong problem-solving skills and ability to work across multiple priorities

Willingness to work in secure, regulated environments (SC eligibility required)

Desirable experience

Infrastructure-as-Code lifecycle and best practices

Containerisation and orchestration (Docker, Kubernetes)

Configuration management and desired state tooling

Application and platform monitoring tools (Splunk, Nagios or similar)

Experience hardening systems and conducting security assessments

Understanding of Agile and DevOps principles in practice

A collaborative, inclusive culture with strong benefits including competitive pay, bonus, pension, private healthcare, generous leave, professional development, wellbeing perks, and modern on-site facilities.

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An exciting opportunity for a passionate Network Security Engineer to join a unique, multi-national Information Management function. Ideal candidates should be committed to protecting our critical systems and ensuring the integrity and security of our network infrastructure.

Salary: Circa £50,000depending on experience+ shift allowance

Dynamic (hybrid) working: 5 days per week on-site due to workload classification, working a 24/7 Shift Pattern

Security Clearance: British Citizen

This role will require DV Clearance. Restrictions and/or limitations relating to nationality and/or rights to work may apply. As a minimum and after offer stage, all successful candidates will need to undergo HMG Basic Personnel Security Standard checks (BPSS) and a Security Check (SC) clearance, which are managed by the MBDA Personnel Security Team.

What we can offer you:

• Company bonus: Up to £2,500 (based on company performance and will vary year to year)
• Pension: maximum total (employer and employee) contribution of up to 14%
• Overtime: opportunity for paid overtime
• Flexi Leave: Up to 15 additional days
• Enhanced parental leave: offers up to 26 weeks for maternity, adoption and shared parental leave -enhancements are available for paternity leave, neonatal leave and fertility testing and treatments
• Facilities: Fantastic site facilities including subsidised meals, free car parking and much more

The opportunity:

Join our forward thinking team as a Network Security Engineer, where you will play a key role in safeguarding our organisations’ network infrastructure as part of the 24x7 Internal Security Response (ISR) team.

When not involved in incident response and triage activity with the SOC team, you will be responsible for designing, implementing and maintaining robust security solutions to protect against evolving threats. Collaborating with cross-functional teams, you will work on implementing changes securely, identifying vulnerabilities, managing security incidents and ensuring compliance with industry best practices.

The role will be involved in the optimisation of network security tools to remediate “purple team” highlighted areas identified for improvement. You will also have the opportunity to immerse your time into the standardisation of network tools.

This is a dynamic opportunity to contribute to security initiatives, solve complex challenges, and have a direct impact on the overall resilience of our IT environment.

If you are passionate about security and proactive defence, this role is the perfect fit.

If you are looking to leverage your technical skills in a values-led company that values innovation and diversity, this is the place to make an impact.

What we’re looking for from you:

ESSENTIALS

• Solid understanding of networking principles (TCP/IP, DNS, routing, switching, VLANS and load balancing)
• Strong expertise in configuring, maintaining and troubleshooting firewalls e.g. Cisco, Checkpoint, Palo Alto
• Demonstrable hands-on experience in next-gen firewalls and advancing security features like IPS/IDS, SSL decryption and deep packet inspection.
• Proven experience in managing secure proxy solutions (e.g. Bluecoat, F5) and the ability to implement policies for content filtering, SSL inspection and network traffic monitoring.
• In depth knowledge of security protocols such as IPSec, SSL / TLS, VPNs and two factor authentication.
• Understanding of network architectures and security zones (DMZ, internal networks).
• Proficient in monitoring technologies e.g. PRTG, Nagios.

DESIRABLES

• Understanding of cyber security capabilities and their integrations to networks infrastructure.
• Existing knowledge of / aptitude to learn Darktrace Antigena and Respond, Splunk ES or Log Rhythm tools.
• Strong ability to interpret complex information via use of packet capture in order to identify malicious traffic in detail, revealing attacker behaviours like C2, exploitation, lateral movement, or data exfiltration.
• Proven ability to review SOC alerting in collaboration with SOC analysts to effectively triage and manage Tier 1 SOC alerts to the appropriate outcome.
• Experience with LDAP, and application traffic flow root cause analysis.
• Previous experience to identify root cause from (TBC for review - Demonstrable understanding of the OSI Reference Model and the network communication protocols, including but not limited to DNS, HTTP/S, SSL, SMTP, FTP/S, LDAP/S. Demonstrable experience with Security Information Event Monitoring Tools and/or Network Packet Capture tools).

Our company: Peace is not a given, Freedom is not a given, Sovereignty is not a given

MBDA is a leading defence organisation. We are proud of the role we play in supporting the Armed Forces who protect our nations. We partner with governments to work together towards a common goal, defending our freedom.

We are proud of our employee-led networks, examples include: Gender Equality, Pride, Menopause Matters, Parents and Carers, Armed Forces, Ethnic Diversity, Neurodiversity, Disability and more

We recognise that everyone is unique, and we encourage you to speak to us should you require any advice, support or adjustments throughout our recruitment process.

Follow us on LinkedIn (MBDA), X Instagram (MBDA_UK) and Glassdoor or visit our MBDA Careers website for more information.