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 Senior Network Engineer who enjoys solving difficult technical challenges and wants their work to have real operational impact. This role requires the highest level of security clearance What You’ll Do As a Senior 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 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 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 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!