Network Engineer
Confirmed on the employer's own hiring board on Sep 29, 2026. First seen by Alion on Sep 24, 2026.
Work on Technology That Protects What Matters
At SiXworks, we build secure digital solutions that support Defence and National Security missions. Our teams work on complex problems where reliability, security, and speed of innovation matter.
We’re looking for a Network Engineerwho enjoys solving difficult technical challenges and wants their work to have real operational impact.
What You’ll Do
As a Network Engineer, you’ll help design, build, and deliver secure digital solutions in highly secure environments. You’ll work alongside engineers, architects, and delivery specialists to develop technology that enables faster, safer decision-making for critical operations.
- Do you feel as comfortable building and supporting production LANs as you do global WANs?
- Can you implement firewall rules from an application’s bespoke requirements?
- Are you a tinkerer able to lab and POC new technologies while also able to be a CLI-jockey?
- Do you want to work in an organisation working on latest technologies and incorporating solutions in an innovative way?
- Are you ready to learn about Secure by Design methodologies from a company working in National Security & Defence?
What We’re Looking For
We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges. You don’t need to tick every box, but we’re particularly interested in people with skills/experience in:
Implementation and Support of;
- Wide Area Network Architecture
- Software-Defined Wide Area Network
- Network Routing Protocols - OSPF, BGP
- Virtual Private Networks (VPNs) and Network Security Infrastructure - e.g. IKEv2, NGFWs
- Creating configuration guides and implementing from High Level and Low Level Designs
Desirable
- Solid networking foundation and principles
- Multi-Vendor Switching
- Firewalling techniques & Hardware - Multi vendor preferred
- WAN Technologies
- Understanding of working in protectively marked environments.
- Ability to work with our customers in an efficient and professional manner
- Able to work on the fly with limited support / access to problem solving materials.
Implementation and Support of;
- Data Centre Network Architecture - Spine/Leaf Fabric, EVPN, BGP, Geneve
- High Assurance IP Encryptors (HAIPE)
- Infrastructure Automation and Orchestration technologies (e.g. Ansible, Terraform etc.)
- Whitebox Network Infrastructure (e.g. Mellanox, Cumulus Linux, Nvidia Networking)
- Support and Troubleshooting of NSX
- Cisco CCNP or equivalent experience
Just as important are curiosity, strong problem solving ability, and the motivation to continuously improve how technology is designed and delivered.
About SiXworks
SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus on digital experimentation, secure-by-design architecture, cloud technologies, and rapid application development to help our customers move faster and stay ahead of evolving challenges.
Our team combines expertise from across technology, business, and operational backgrounds including the armed forces creating a collaborative environment where practical thinking and innovation thrive.
Why Join Us
Our culture is guided by six principles: Agility, Security, Innovation, Quality, Collaboration and Inclusivityour North Star for how we work. SiXworks is a leading provider of secure digital solutions, specialising in digital experimentation and focused on fail-safe-fast cutting-edge technology solutions deployed in highly secure environments.
As an end-to-end digital innovation and delivery partner, we turn complex challenges into mission-critical digital advantages. This is a thrilling time for us, with ambitious plans for growth. We are looking for brilliant, experienced, driven and self-motivated people to join the team on our journey.
We offer competitive salaries and a package that supports your wellbeing and development, including 25 days annual leave + bank holidays, free Private Medical cover and Life Assurance, Generous pension (10% employer, 5% employee contribution), Bonus and Professional development and training support. In addition to secure parking, gym, café & restaurant on site and lots of open break out spaces.
A word on UK Security Clearance
Due to the secure nature of the position and working environment, you must have or be eligible to obtain Security Clearance. More details relating to UK Security Clearance can be found here:
United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk)
Interested?
Please apply!