Principal Network Architect - Consulting

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.)

Training

CACI Network Services develops individuals through a portfolio of training and development options such as certified training courses, workshops, technical conferences, boot camps, on-line training and much more. You will have the opportunity to work on some of the most advanced networking hardware in the industry as well as development of your abilities and talents to become one of the best in the field.

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.

Benefits

• Competitive salary
• Target based commission package
• Matched pension contributions up to 5%
• Life Insurance
• Personal Accident Insurance
• Private Health Insurance from 2nd anniversary
• Sickness & Disability income protection from 3rd anniversary
• On site gym membership at our Kensington Office.

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 favourably 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 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.