Senior Network Engineer (SME Level)

CACI; Abbots Worthy; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A consulting firm is seeking a Senior Network Engineer with expertise in Cisco ACI and VMware NSX-T to develop network architecture. The role includes enhancing Firewall solutions according to Zero Trust principles and documenting security postures. Strong communication and technical skills are essential. The position offers a hybrid work environment in Winchester, England, aiming for operational excellence in data centers.

Qualifications

• Deep expertise in Cisco ACI and VMware NSX-T is essential.
• Experience designing and optimizing Firewall solutions and a Zero Trust network.
• Strong technical writing and excellent communication skills are required.

Responsibilities

• Develop and implement network architecture for Cisco ACI and NSX-T environments.
• Design and optimize Firewall solutions aligned with Zero Trust principles.
• Utilize tools such as APIs and IP Fabric to document current state.

Skills

Cisco ACI

VMware NSX-T

Firewall architecture design

Zero Trust principles

Automation and IaC

Technical documentation

Excellent communication

Job description

We are seeking a Senior Network Engineer (SME Level) with deep expertise in Cisco ACI, VMware NSX-T, and Firewall architecture, design, and operations. The ideal candidate will operate at a consultant level, providing strategic input on architecture and design while ensuring robust security and operational excellence across data center environments.

Technical Skills & Key Responsibilities

• Develop and implement network architecture for Cisco ACI and NSX-T environments.
• Design and optimize Firewall solutions (Cisco ASA & Checkpoint) aligned with Zero Trust principles.
• Assess current Firewall rule base and migrate to NSX Distributed Firewall (DFW).
• Consolidate physical to virtual Firewall environments.
• Utilize tools such as APIs and IP Fabric to document current state (security posture, routing).
• Conduct audits and discovery to ensure compliance and operational integrity.
• Implement automation and Infrastructure-as-Code (IaC) practices for network deployments.
• Liaise with stakeholders to gather requirements and provide technical recommendations.
• Produce high-quality technical documentation and reports.
• Cisco ACI: Architecture, Design, and Operations
• VMware NSX-T: Architecture, Design, and Operations
• Firewalls: Cisco ASA & Checkpoint expertise
• Security: Zero Trust principles
• Automation: Familiarity with Scripting and IaC tools
• Excellent communication and stakeholder management skills
• Strong technical writing and documentation abilities
• Ability to work independently and as part of a team

Soft Skills 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.

Winchester, Hampshire - Market Rate Full Time

Posted by: CACI Network Services

Posted: Tuesday, 9 December 2025

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. 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.

Disability Confident Employer Information

• 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.