NS Financial - Senior Engineer I

Colonial Group; Greater London; Hybrid; GBP 55,000 - 85,000; Full time

Job summary

CACI Network Services is seeking a motivated Network Engineer to design, implement and support LAN, WAN and data centre networks across London and the Home Counties. You will help ensure highly available, scalable network architectures and contribute to technical standards.

Join a growing team delivering challenging environments for major clients in the public and private sectors. We value collaboration, clear communication and a proactive approach to problem solving.

Qualifications

• Solid understanding of TCP/IP and routing protocols (e.g. OSPF, BGP).
• Experience designing, building and supporting LAN/WAN networks.
• Strong knowledge of Routing & Switching (CCNA or CCNP level).
• Experience with WAN technologies (e.g. MPLS, VPNs).
• Exposure to firewall technologies (Check Point, Palo Alto, Fortinet or Cisco).
• Knowledge of Application Delivery Controllers (e.g. F5, Citrix).
• Experience producing network design documentation (HLD/LLD).
• Strong communication and stakeholder engagement skills.

Responsibilities

• Design, implement and support LAN, WAN and Data Centre networks
• Assist in maintaining highly available and scalable network architectures
• Produce and maintain network design documentation (HLD/LLD)
• Support and troubleshoot network and infrastructure issues
• Work closely with internal teams and clients on project delivery

Skills

TCP/IP basics

LAN/WAN design

Routing & Switching

MPLS/VPNs

Firewall technologies

ADC (F5/Citrix)

Design documentation

Stakeholder comms

Job description

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

The role

We’re looking for a motivated Network Engineer to support a range of projects across London and the Home Counties. You’ll play a key role in designing, implementing and supporting highly available network environments, while contributing to best practices and technical standards across the business.

Key responsibilities

• Design, implement and support LAN, WAN and Data Centre networks
• Assist in maintaining highly available and scalable network architectures
• Produce and maintain network design documentation (HLD/LLD)
• Support and troubleshoot network and infrastructure issues
• Work closely with internal teams and clients on project delivery

Core skills, knowledge and experience required

• Solid understanding of TCP/IP and routing protocols (e.g. OSPF, BGP)
• Experience designing, building and supporting LAN/WAN networks
• Strong knowledge of Routing & Switching (CCNA or CCNP level)
• Experience with WAN technologies (e.g. MPLS, VPNs)
• Exposure to firewall technologies (Checkpoint, Palo Alto, Fortinet or Cisco)
• Knowledge of Application Delivery Controllers (e.g. F5, Citrix)
• Experience producing network design documentation (HLD/LLD)
• Strong communication and stakeholder engagement skills

Desirable Skills

• Network automation (e.g. Ansible, Python)
• Software-defined networking (e.g. Cisco ACI, SD-WAN, VMware NSX, Nuage)
• Exposure to cloud platforms (AWS, Azure)

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 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.