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Network Engineer
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.
- Participating in an on-call rotation to ensure incidents can be swiftly resolved.
Your work may include:
- Engaging and improving the operations and implementation of secure cloud platform network systems.
- Maintaining, securing, and debugging cross-cluster communications in an air-gapped Kubernetes infrastructure.
- Scaling systems sustainably through automation, and evolving systems by implementing changes that improve network reliability, security, and performance.
What We’re Looking For
We value personnel who take ownership, think critically, and enjoy collaborating on complex challenges.
While you don’t need to tick every box, we’re particularly interested in candidates with the following skills/experience:
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- 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 (WAN), L2–L7 network protocols, and Border Gateway Protocol (BGP).
- Linux systems administration or Kubernetes.
- MPLS L3 VPN or kernel-level/data plane cloud-native networking.
- Hands-on experience deploying and operating production workloads in Kubernetes.
- A Deep practical understanding of Kubernetes networking models, including proven debugging experience with CNI plugins (e.g., Cilium) and Service Mesh (e.g., Istio) architectures.
- 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
- 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
- Rapid application development
This allows our customers to move faster and stay ahead of evolving challenges.
Our team combines expertise from:
- Technology
- Business
- Operational backgrounds (including former armed forces personnel), creating a collaborative environment where practical thinking and innovation thrive.
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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 an exciting time for us, with ambitious plans for growth. We’re looking for brilliant, experienced, driven, and self-motivated people to join the team on this 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 scheme and Professional development/training support
- Secure parking, gym, café & restaurant on site, plus lots of open breakout spaces
Security Clearance Requirement
Due to the secure nature of the position and working environment, you must:
- Have or be eligible to obtain UK Security Clearance.
For more details, visit: United Kingdom Security Vetting: clearance levels.
Ready to Join?
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