QA Test Infrastructure Engineer

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

As aQA Test 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.

• Ensuring quality of products as they move from prototype / proof of concept into Production.
• Analyse infrastructure requirements and architectures; identify test conditions; maintain traceability; log risks.
• Create infrastructure-focused test strategies and plans defining scope, environments, tooling, automation, and governance entry/exit criteria.
• Provision and validate test environments in collaboration with Dev Sec Ops , ensuring OS, network, platform services, monitoring, and pipelines align to readiness standards.
• Design and execute tests across physical infrastructure and IaC, including functional, integration, regression, resilience, non-functional, and security-related scenarios.
• Apply Secure-by-Design principles; support security testing; contribute to accreditation, assurance, and compliance documentation.

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:

Infrastructure, Networking & Operating Systems

• Strong understanding of TCP/IP, DNS, DHCP, routing, switching, firewalls, VLANs, and related network behaviours.
• Experience with physical infrastructure setup and troubleshooting (routers, switches, cabling).
• Proficiency with Linux/Unix command line for diagnostics, configuration, and validation.
• Experience working across virtualisation platforms (VMware, Virtual Box) and cloud environments (AWS, Azure, GCP).

Infrastructure as Code (IaC)

• Terraform: writing/validating HCL, managing state, using modules.
• Ansible: building playbooks/roles, inventories, and validating idempotency.
• Kubernetes: deploying workloads, validating manifests, managing clusters, and testing containerised applications.

CI/CD & Automation

• Familiarity with CI/CD tooling (Jenkins, Git Lab CI, Git Hub Actions).
• Experience integrating IaC validation and environment checks into automated pipelines.
• Understanding of pipeline gating, automated readiness checks, and environment orchestration.

Security & Compliance

• Strong grounding in Secure-by-Design principles, IAM, least privilege, OS hardening, network segmentation, and observability.
• Experience with in regulated or highly governed environments (e.g., MOD or similar).
• Ability to support compliance, assurance, and accreditation activity.

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

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…