Senior Infrastructure Engineer

IBM SiXworks; Farnborough; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

25 days annual leave + bank holidays

Private medical cover

Life Assurance

Pension (10% employer, 5% employee) [s

Bonus

Professional development and training

Secure parking

Gym on site

Café & restaurant on site

Open break out spaces

Job summary

SiXworks is seeking a Senior Infrastructure Engineer to design, build and secure digital solutions for defence and national security missions. You’ll work in highly protected environments, delivering secure, scalable infrastructure across multi-classification systems.

You will maintain Windows and Linux environments, manage virtualization, and support hybrid cloud applications. A UK security clearance or eligibility is essential for this role.

Qualifications

• Senior infrastructure engineer with hands-on experience in secure environments.
• Knowledge of Windows and Linux server administration, virtualization, and cloud capabilities.
• Experience with security-focused design, incident response, and automation.

Responsibilities

• Maintain, improve, and secure SiXworks’ multi-classification, virtualised, collaboration and development environments.
• Improve Secure by Design capabilities with IT infrastructure colleagues.
• Provide infrastructure support to Office 365 and project-based cloud implementations (public, private, hybrid).
• Perform maintenance tasks on infrastructure through change control.
• Monitor and manage tickets/alerts; triage incidents; maintain monitoring components.
• Patch platforms per provider recommendations and security policy.
• Assess incident impact, restore service, and follow up actions.
• Identify trends and plan changes to improve stability and performance.
• Maintain cutting-edge knowledge and pursue relevant certifications.
• Advise customers and project teams on infrastructure and support aspects.
• Cascade knowledge through team articles and wider organisation.
• Support SiXworks in winning business.

Skills

Windows Server administration

RedHat OpenShift

SSO concepts

VMware

Networking

Kubernetes administration

Automation (Ansible/PowerShell)

DevSecOps tooling

Elastic

Nessus

Experience working in Agile sprints

Tools

HashiCorp Terraform

HashiCorp Vault

VMware TKGI

Job description

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

This role requires the highest level of UK security clearance.

What You’ll Do

As a Senior Infrastructure 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.

Your work may include:

• Maintain, improve, and secure SiXworks’ multi-classification, virtualised, collaboration and development environments.
• Work with IT infrastructure colleagues to improve SiXworks’ ‘Secure by Design’ capabilities, internally and across its projects.
• Provide Infrastructure support to SiXworks’ public cloud SaaS offerings (Office 365) as well as project-based systems (public, private and hybrid clouds) in implementation and support lifecycles.
• Perform maintenance tasks on the infrastructure through change control.
• Assist with monitoring and management of SiXworks’ and project-based ticketing and alerting systems for new changes and security alerts.
• Triage monitoring alerts and perform appropriate action.
• Maintain monitoring components in line with infrastructure developments.
• Ensure all platforms are patched in line with provider recommendations and SiXworks security policy.
• Quickly and accurately assess impact of incidents, initiate return to service and ensure follow up actions are completed.
• Identify trends and problems and plan changes to improve stability and performance.
• Maintain cutting edge knowledge and skills in the design and build of secure public, private, and hybrid cloud and network technologies.
• Develop personal knowledge through study/research toward vocational certifications in relevant technologies/vendors.
• Advise customers and project teams on infrastructure and support aspects.
• Cascade knowledge through knowledge articles for the team and wider organisation.
• Support the SiXworks team in winning business.

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:

• Team Player
• Windows Server 2016+ administration.
• RedHat Openshift
• EUD provisioning (Autopilot), maintenance, patching and hardening.
• SSO – concepts and operation.
• Understanding of working in protectively marked environments.
• VMware
• Networking
• Automation (scripting ansible/powershell)
• Kubernetes administration e.g. VMware TKGI
• VMware vSphere/vCenter/VCF.
• DevSecOps Tooling
• Elastic
• Nessus
• Application Packaging
• HashiCorp Terraform
• HashiCorp Vault
• Experience working in Agile sprints

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.

• 25 days annual leave + bank holidays
• free Private Medical cover
• Life Assurance
• Generous pension (10% employer, 5% employee contribution)
• Bonus
• Professional development and training support
• secure parking
• gym
• café & restaurant on site
• 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)