Network Engineer

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 Engineer who enjoys solving difficult technical challenges and wants their work to have real operational impact.

What You’ll Do

As a Network Engineer, your work will bridge cloud native infrastructure engineering and platform networking, working on both traditional underlay networking and software defined networking within a Kubernetes architecture. You will be the glue that keeps containerised, and cloud-hosted services up and running, responsible for configuring and maintaining cloud platform infrastructure, virtual networking resources, and automation workflows from inception to optimisation.

You will participate in an on-call rotation to ensure incidents can be swiftly resolved.

Your work may include:

• Engage and improve the operations and implementation of secure cloud platform network systems.


• Maintain, secure, and debug cross-cluster communications in an air-gapped kubernetes infrastructure.


• Scale systems sustainably through mechanisms like automation, and evolve systems by implementing changes that improve network reliability, security and performance.

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:

• Experience with supporting, troubleshooting and implementing resilient, secure networks using a wide range of technologies.


• 3-5 years of experience with IP Networking, multi-tenant Wide Area Networks, L2-L7 network protocols, and Border Gateway Protocol.


• Experience directing field operation technicians, engineers, and extended workforces in a telecommunications environment.


• 3-5 years of experience with Linux systems administration or kubernetes.


• Experience with MPLS L3 VPN or kernel level/data plane cloud native networking.


• Hands-on experience deploying and operating production workloads in Kubernetes.


• Deep practical understanding of the Kubernetes networking model, with proven experience debugging CNI plugin (e.g. Cilium) configurations and Service Mesh (e.g. Istio) architectures.


• Experience of infrastructure automation (e.g. using Git, Bash or Python) to eliminate manual operation toil, manage environment configurations, and orchestrate complex platform upgrades.

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 Inclusivity our 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!