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

This role is on site 5 days a week in Somerset

What You’ll Do

As a QA 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.

Your work may include:

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 DevSecOps, 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.

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:

Infrastructure, Networking & Operating Systems

Strong understanding of TCP/IP, DNS, DHCP, routing, switching, firewalls, VLANs, and r...