Security Platform Engineer: Build Secure Infra & CI​/CD

Work on Technology That Protects What Matters

At Si Xworks , 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 Security Platform Engineer who enjoys solving difficult technical challenges and wants their work to have real operational impact.

What You’ll Do

As a Security Platform 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:

• Deploy, and maintain secure infrastructure within Kubernetes environments
• Administer and maintain Splunk for log aggregation, monitoring, alerting, and threat detection
• Operate and manage Nessus for vulnerability scanning, reporting, and remediation tracking
• Integrate security tools into CI/CD pipelines and cloud-native workflows
• Automate security processes using scripting or infrastructure-as-code approaches
• Collaborate with engineering and Dev Ops teams to embed security best practices
• Maintain artefacts as code and documentation for systems, processes, and configurations
• Documenting configuration of security tooling.

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:

• Proven experience as a Security Engineer, Platform Engineer, or similar role
• Deploying and managing EDR agents
• Hands-on experience with Kubernetes
• Experience managing and administering SIEM tooling (e.g. Splunk)
• Experience deploying vulnerability scanning and analysis tooling (e.g. Nessus)
• Kubernetes observability (e.g. fluentbit)
• Familiarity with container security principles and tools
• Scripting or automation skills (e.g. Python, Bash, or similar)
• Understanding of security frameworks and best practices
• Knowledge of configuring SIEM tooling.
• Basic understanding of threat frameworks, such as ATT&CK.
• Experience with additional SIEM or observability platforms
• Experience with Microsoft Defender
• Experience with Dev Sec Ops  practices and pipeline security
• Certifications such as CKA, CKAD, CISSP, CEH, or similar
• Exposure to threat modelling and security architecture design

Just as important are curiosity, strong problem solving ability, and the motivation to continuously improve how technology is designed and delivered.

About Si Xworks

SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus ondigital 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 InclusivityourNorth Starfor how we work. SiXworksis 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,…