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About the Role

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.

Responsibilities

Operate as a trusted advisor for key clients and prospective customers.
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.
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, 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.
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.
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.

Requirements

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.
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.
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.
Successful candidates must have the right to work in the UK.

Skills

Enterprise LAN/WAN
SD-WAN
SDA
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)
Automation
Orchestration
Infrastructure‑as‑Code
CCNP / CCIE
JNCIP / JNCIE
Fortinet (NSE)
Palo Alto (PCNSE/PCNSA)
Cisco Security (CCNP Security/CCIE Security)
Check Point (CCSA/CCSE)
Cloud certifications (AWS/Azure/GCP/OCI)
ITIL
PRINCE2
AgilePM
Python
Ansible
Terraform

Location

London

Work Type

Hybrid

Experience Level

Principal
Senior

About the Company

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.

Equal Opportunity

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.
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.