Job Description
Headquartered in London, CACI Ltd is a wholly owned subsidiary of CACI International Inc., a publicly listed company on the NYSE with annual revenue in excess of US $6.2bn and employing approx. 22,000 people worldwide.
CACI Ltd is an international data and technology consultancy with £154m turnover and 1200 employees. We are passionate, progressive and unafraid of challenge; our mission is to use technology and data-driven insight to make a commercial difference.
We provide expert advice and hands-on system management to help our national and global clients get the most from technology and data. We use innovation wisely to deliver well thought-out digital solutions and software.
CACI's Digital Solutions, Operational Systems and Network Services Groups provide a range of software, Consultancy and managed services to clients. With experience and understanding of systems integration, analytics and secure cloud and managed services, we help clients improve operational processes, gain greater insight into their business and reduce costs.
From data integration, web reporting and activity-based costing to mobile working, telecom operational support systems and online transactional solutions, we help our clients to understand their business, manage performance and deliver value for money services to their customers.
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.
As a Principal Network Architect, you will be a trusted advisor, technical authority, and strategic partner to our clients. You will lead the design of complex, secure, and scalable network architectures, translating business requirements into robust technical solutions. This role combines technical leadership, solution architecture, consultancy, and pre-sales engagement, requiring a strong ability to operate at both strategic and hands-on levels. You will work closely with customers, sales, delivery teams, engineering functions, and senior stakeholders—guiding engagements from initial concept through to detailed design, delivery oversight and operational readiness.
Key Responsibilities
Client Engagement & Consultancy
• Operate as a trusted advisor for key clients and prospective customers (new logos).
• Engage with stakeholders from C-level executives to technical engineering teams, translating complex technical and business requirements into high level and detailed technical architectures.
• Provide expert consultancy on network strategy, transformation roadmaps, best practices, and emerging technologies.
• Build strong, long-term relationships that support account growth and customer satisfaction.
Technical Leadership & Architecture
• Act as the Design Authority across major programmes, owning the end to end technical vision from inception through transition to operations.
• Architect network solutions across environments of varying scale—from small to mid sized infrastructures through to highly complex, large scale enterprise and multi site architectures—covering LAN/WAN, Wireless, routing, switching, SDN, and security technologies. Ensure all designs are scalable, resilient, secure, and aligned to customer requirements, technical strategy, and industry best practices
• Lead creation of high-quality architectural documentation, including HLA, HLD, LLD, standards, and design patterns.
• Ensure designs align with industry best practices, compliance requirements, and customer governance processes.
Pre Sales, Bids & Commercial Support
• Partner with the Sales team during pre sales engagements to define solutions, scope opportunities, and support commercial proposition development.
• Lead technical responses for Tenders, IITs, and RFPs, including architecture design, technical writing, risk identification, and pricing model support.
• Present proposed solutions to senior client stakeholders with clarity, confidence, and technical authority.
Collaboration & Delivery Oversight
• Work alongside multi-disciplinary delivery teams, providing leadership, technical guidance, and assurance during implementation phases.
• Support project managers and engineering teams to ensure solutions are delivered in line with architectural intent and to the highest quality.
• Contribute to internal knowledge sharing, capability development, and practice maturity across the organisation.
• Contribute to the identification, design, and development of innovative internal products, frameworks, and service offerings that enhance CACI’s strategic advantage, improve delivery efficiency, and support growth across key market sectors.
Technology Coverage
Across a broad and evolving technology landscape, including:
• Enterprise LAN/WAN, SD-WAN, SDA and Wireless architectures
• Data Centre end to end solutions
• Routing & switching technologies
• Network Security, Firewalls, Zero Trust, SASE/SSE
• Software-defined networking solutions
• Cloud networking (AWS / Azure / GCP / OCI) – highly desirable
• Automation, orchestration & Infrastructure as Code - desirable
What We’re Looking For
Technical & Professional Expertise
• Proven experience designing and delivering large-scale network and security solutions across enterprise or service provider environments.
• Deep understanding of network architecture principles, high availability design, routing protocols, segmentation, security architectures, and cloud networking.
• Experience acting as the final technical authority or Design Authority on complex engagements.
• Strong background in pre sales, tender responses, and solution shaping.
• Ability to clearly articulate complex technical concepts to non technical audiences and senior stakeholders.
Consultancy & Communication
• Excellent interpersonal, written, and verbal communication skills—capable of producing well-structured technical documentation and delivering impactful presentations.
• Ability to engage with business stakeholders and end-users to diagnose issues, propose solutions, and provide strategic recommendations.
• Comfortable representing the organisation independently, with a focus on delivering outstanding customer experiences.
Ways of Working
• Demonstrably collaborative approach when working with sales, engineering, and delivery functions.
• Self-sufficient, proactive, and comfortable working in high-pressure environments.
• Experience working within Agile / Scrum, Waterfall, and hybrid project delivery methodologies.
• Strong commitment to continuous learning and staying ahead of industry advancements.
Desirable Certifications & Skills
(Certifications not required but advantageous)
• CCNP / CCIE, JNCIP / JNCIE, or equivalent expert-level certifications
• Security vendor certifications from platforms such as Fortinet (NSE), Palo Alto (PCNSE/PCNSA), Cisco Security (CCNP Security/CCIE Security), and Check Point (CCSA/CCSE).
• Cloud certifications (AWS/Azure/GCP/OCI)
• Strong understanding of structured delivery and operational frameworks (ITIL, PRINCE2, AgilePM, or similar project/service management certifications)
• Experience with automation tools (Python, Ansible, Terraform, etc.)
Expected behaviours
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 on 020 7602 6000 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.
We are committed to creating a diverse environment and are proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, colour, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.
Successful candidates must have the right to work in the UK.
